140 results match your criteria Pyrenebutyric acid


A label-free biosensor based on graphene and reduced graphene oxide dual-layer for electrochemical determination of beta-amyloid biomarkers.

Mikrochim Acta 2020 04 25;187(5):288. Epub 2020 Apr 25.

Wolfson Nanomagnetics Laboratory, School of Engineering, Computing and Mathematics, University of Plymouth, Devon, PL4 8AA, UK.

A label-free biosensor is developed for the determination of plasma-based Aβ biomarker in Alzheimer's disease (AD). The platform is based on highly conductive dual-layer of graphene and electrochemically reduced graphene oxide (rGO). The modification of dual-layer with 1-pyrenebutyric acid N-hydroxysuccinimide ester (Pyr-NHS) is achieved to facilitate immobilization of H31L21 antibody. Read More

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http://dx.doi.org/10.1007/s00604-020-04267-xDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7182627PMC

Redox-Responsive Efficient DNA and Drug Co-Release from Micelleplexes Formed from a Fluorescent Cationic Amphiphilic Polymer.

Langmuir 2019 11 29;35(45):14616-14627. Epub 2019 Oct 29.

Department of Chemistry , Indian Institute of Technology Kharagpur , Kharagpur , West Bengal 721302 , India.

Cationic polymeric micelles that are capable of co-releasing drugs and DNA into cells have attracted considerable interest as combination chemotherapy in cancer treatment. To this effect, we have presently developed a cationic fluorescent amphiphilic copolymer, poly(,'-dimethylaminoethylmethacrylate)--(poly(2-(methacryloyl)oxyethyl-2'-hydroxyethyl disulfidecholate)--2-(methacryloyloxy)ethyl-1-pyrenebutyrate) [PDMAEMA--(PMAODCA--PPBA)], having pendent cholate moiety linked through a redox-responsive disulfide bond. The amphiphilic nature of the copolymer facilitated the formation of cationic micellar nanoparticles in aqueous medium. Read More

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http://dx.doi.org/10.1021/acs.langmuir.9b02921DOI Listing
November 2019

Chemically Functionalised Graphene FET Biosensor for the Label-free Sensing of Exosomes.

Sci Rep 2019 09 26;9(1):13946. Epub 2019 Sep 26.

Department of Materials, Imperial College London, London, SW7 2AZ, UK.

A graphene field-effect transistor (gFET) was non-covalently functionalised with 1-pyrenebutyric acid N-hydroxysuccinimide ester and conjugated with anti-CD63 antibodies for the label-free detection of exosomes. Using a microfluidic channel, part of a graphene film was exposed to solution. The change in electrical properties of the exposed graphene created an additional minimum alongside the original Dirac point in the drain-source current (I) - back-gate voltage (V) curve. Read More

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http://www.nature.com/articles/s41598-019-50412-9
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http://dx.doi.org/10.1038/s41598-019-50412-9DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6763426PMC
September 2019
3 Reads

Detection of Nitroaromatics by Pyrene-Labeled Starch Nanoparticles.

Langmuir 2019 10 23;35(40):13145-13156. Epub 2019 Sep 23.

Institute for Polymer Research, Waterloo Institute for Nanotechnology, Department of Chemistry , University of Waterloo , Waterloo , ON N2L 3G1 , Canada.

Starch nanoparticles (SNPs) were hydrophobically modified by using 1-pyrenebutyric acid (PyBA) with degrees of substitution (DS) between 0.0006 and 0.11. Read More

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http://dx.doi.org/10.1021/acs.langmuir.9b02371DOI Listing
October 2019
6 Reads

A Sequential Process of Graphene Exfoliation and Site-Selective Copper/Graphene Metallization Enabled by Multifunctional 1-Pyrenebutyric Acid Tetrabutylammonium Salt.

ACS Appl Mater Interfaces 2019 Feb 4;11(6):6448-6455. Epub 2019 Feb 4.

Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science , Northwest University , 710069 Xi'an , People's Republic of China.

This paper reports a procedure leading to shear exfoliation of pristine few-layer graphene flakes in water and subsequent site-selective formation of Cu/graphene films on polymer substrates, both of which are enabled by employing the water soluble 1-pyrenebutyric acid tetrabutylammonium salt (PyB-TBA). The exfoliation with PyB-TBA as an enhancer leads to as-deposited graphene films dried at 90 °C that are characterized by electrical conductivity of ∼110 S/m. Owing to the good affinity of the tetrabutylammonium cations to the catalyst PdCl, electroless copper deposition selectively in the graphene films is initiated, resulting in a self-aligned formation of highly conductive Cu/graphene films at room temperature. Read More

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http://pubs.acs.org/doi/10.1021/acsami.8b21162
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http://dx.doi.org/10.1021/acsami.8b21162DOI Listing
February 2019
5 Reads

Detection of Alpha-Fetoprotein in Hepatocellular Carcinoma Patient Plasma with Graphene Field-Effect Transistor.

Sensors (Basel) 2018 Nov 19;18(11). Epub 2018 Nov 19.

Department of Medical IT Convergence Engineering, Kumoh National Institute of Technology, Gumi, Gyeongbuk 39177, Korea.

The detection of alpha-fetoprotein (AFP) in plasma is important in the diagnosis of hepatocellular carcinoma (HCC) in humans. We developed a biosensor to detect AFP in HCC patient plasma and in a phosphate buffer saline (PBS) solution using a graphene field-effect transistor (G-FET). The G-FET was functionalized with 1-pyrenebutyric acid -hydroxysuccinimide ester (PBASE) for immobilization of an anti-AFP antibody. Read More

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http://dx.doi.org/10.3390/s18114032DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6263997PMC
November 2018
32 Reads

Preparation of Graphene Oxide-Based Supramolecular Hybrid Nanohydrogel Through Host-Guest Interaction and Its Application in Drug Delivery.

J Biomed Nanotechnol 2018 Dec;14(12):2056-2065

Graphene oxide (GO) has attracted a wide attention for its excellent mechanical, thermal properties and unique two-dimensional structure. In this work, A new GO-based supramolecular hybrid nanohydrogel was prepared, in which GO as the cross-links was incorporated into the above hydrogel through non-covalent functionalization to enhance the mechanical properties and control morphology. A 1-pyrenebutyric acid (Py) modified low-molecular weight (MW) mPEG was firstly synthesized via a simple esterification reaction. Read More

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http://dx.doi.org/10.1166/jbn.2018.2648DOI Listing
December 2018
1 Read

Electrochemical and Electronic Properties of Transparent Coating from Highly Solution Processable Graphene Using Block Copolymer Supramolecular Assembly: Application toward Metal Ion Sensing and Resistive Switching Memory.

ACS Omega 2018 Jun 29;3(6):7106-7116. Epub 2018 Jun 29.

Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, Uttar Pradesh, India.

Here, we have discussed the preparation of a highly solution processable graphene from a novel supramolecular assembly consisting of block copolymer polystyrene--poly(4-vinylpyridine) (PS--P4VP) and pyrenebutyric acid (PBA)-modified reduced graphene oxide (RGO). The PBA molecules anchored on the graphene surface form supramolecules with PS--P4VP through H-bonding between the carboxylic acid group of 1-pyrenebutyric acid and the pyridine ring of P4VP. The formation of a supramolecular assembly results in a highly stable solution of reduced graphene oxide in common organic solvents, such as 1,4-dioxane and chloroform. Read More

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http://dx.doi.org/10.1021/acsomega.8b00883DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6644669PMC

Assessment of peanut allergen Ara h1 in processed foods using a SWCNTs-based nanobiosensor.

Biosci Biotechnol Biochem 2018 Jul 23;82(7):1134-1142. Epub 2018 Mar 23.

a Department of Plant and Food Sciences , Sangmyung University , Cheonan-Si , Republic of Korea.

The goals of this research were to develop a rapid single-walled carbon nanotube (SWCNT)-based biosensor and to employ it to commercial food products for Ara h1 detection. The SWCNT-based biosensor was fabricated with SWCNTs immobilized with antibody (pAb) through hybridization of 1-pyrenebutanoic acid succinimidyl ester (1-PBASE) as a linker. The resistance difference (ΔR) was calculated by measuring linear sweep voltammetry (LSV) using a potentiostat. Read More

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http://dx.doi.org/10.1080/09168451.2018.1453295DOI Listing
July 2018
26 Reads

Development of a Label-Free Immunosensor for Clusterin Detection as an Alzheimer's Biomarker.

Sensors (Basel) 2018 Jan 20;18(1). Epub 2018 Jan 20.

Wolfson Nanomaterials & Devices Laboratory, School of Computing, Electronics and Mathematics, Faculty of Science and Engineering, University of Plymouth, Devon PL4 8AA, UK.

Clusterin (CLU) has been associated with the clinical progression of Alzheimer's disease (AD) and described as a potential AD biomarker in blood plasma. Due to the enormous attention given to cerebrospinal fluid (CSF) biomarkers for the past couple of decades, recently found blood-based AD biomarkers like CLU have not yet been reported for biosensors. Herein, we report the electrochemical detection of CLU for the first time using a screen-printed carbon electrode (SPCE) modified with 1-pyrenebutyric acid -hydroxysuccinimide ester (Pyr-NHS) and decorated with specific anti-CLU antibody fragments. Read More

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http://dx.doi.org/10.3390/s18010308DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5795331PMC
January 2018
12 Reads

Peptide aptamer-modified single-walled carbon nanotube-based transistors for high-performance biosensors.

Sci Rep 2017 12 20;7(1):17881. Epub 2017 Dec 20.

School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi city, Ishikawa, 923-1292, Japan.

Biosensors employing single-walled carbon nanotube field-effect transistors (SWCNT FETs) offer ultimate sensitivity. However, besides the sensitivity, a high selectivity is critically important to distinguish the true signal from interference signals in a non-controlled environment. This work presents the first demonstration of the successful integration of a novel peptide aptamer with a liquid-gated SWCNT FET to achieve highly sensitive and specific detection of Cathepsin E (CatE), a useful prognostic biomarker for cancer diagnosis. Read More

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http://dx.doi.org/10.1038/s41598-017-18169-1DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5738443PMC
December 2017
12 Reads

Laser-Scribed Graphene Electrodes for Aptamer-Based Biosensing.

ACS Sens 2017 May 1;2(5):616-620. Epub 2017 May 1.

Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg , Universitaetsstrasse 31, 93053 Regensburg, Germany.

Graphene as a transducer material has produced some of the best-performing sensing approaches to date opening the door toward integrated miniaturized all-carbon point-of-care devices. Addressing this opportunity, laser-scribed graphene (LSG) electrodes are demonstrated here as highly sensitive and reliable biosensor transducers in blood serum analysis. These flexible electrodes with large electrochemical surface areas were fabricated using a direct-write laser process on polyimide foils. Read More

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http://dx.doi.org/10.1021/acssensors.7b00066DOI Listing
May 2017
11 Reads

Pyrene-tagged carbohydrate-based mixed P/S ligand: spacer effect on the Rh(i)-catalyzed hydrogenation of methyl α-acetamidocinnamate.

Org Biomol Chem 2017 Jul 29;15(27):5772-5780. Epub 2017 Jun 29.

Instituto de Investigaciones Químicas (IIQ), CSIC and Universidad de Sevilla, C/Américo Vespucio 49, 41092, Seville, Spain.

The post-functionalization of a chiral catalyst offers the advantage of providing it with additional physical characteristics that, together with its enantioselective capacity, increase its overall synthetic value. Taking advantage of the modularity and polyfunctionality of carbohydrate-derived ligands, herein we report the synthesis of two mixed P/S catalysts functionalized with a pyrene group through the 6 position of the sugar by carbon chains of different lengths. Using the hydrogenation of methyl (Z)-α-acetamidocinnamate as the model reaction has shown that the proximity of the pyrenyl group to the catalytic center is detrimental to the activity and enantioselectivity of the hydrogenation process, the most efficient catalyst being the complex derived from pyrenebutyric acid 12. Read More

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http://dx.doi.org/10.1039/c7ob01085kDOI Listing
July 2017
6 Reads

Pyrenyl carbon nanostructures for ultrasensitive measurements of formaldehyde in urine.

Anal Chim Acta 2017 Jun 27;970:23-29. Epub 2017 Mar 27.

Department of Chemistry, Oklahoma State University, 107 Physical Sciences Building, Stillwater, OK 74078, USA. Electronic address:

Measurement of ultra-low (e.g., parts-per-billion) levels of small-molecule markers in body fluids (e. Read More

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http://dx.doi.org/10.1016/j.aca.2017.03.032DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5443713PMC
June 2017
52 Reads

Ultrasensitive Label-Free Sensing of IL-6 Based on PASE Functionalized Carbon Nanotube Micro-Arrays with RNA-Aptamers as Molecular Recognition Elements.

Biosensors (Basel) 2017 Apr 17;7(2). Epub 2017 Apr 17.

Small Systems Laboratory, Department of Mechanical Engineering, Worcester Polytechnic Institute, Worcester, MA 01532, USA.

This study demonstrates the rapid and label-free detection of Interleukin-6 (IL-6) using carbon nanotube micro-arrays with aptamer as the molecular recognition element. Single wall carbon nanotubes micro-arrays biosensors were manufactured using photo-lithography, metal deposition, and etching techniques. Nanotube biosensors were functionalized with 1-Pyrenebutanoic Acid Succinimidyl Ester (PASE) conjugated IL-6 aptamers. Read More

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http://dx.doi.org/10.3390/bios7020017DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5487960PMC
April 2017
14 Reads

On Monolayer Formation of Pyrenebutyric Acid on Graphene.

Langmuir 2017 04 4;33(15):3588-3593. Epub 2017 Apr 4.

Division of Solid State Electronics, Department of Engineering Sciences, Uppsala University , SE-751 21 Uppsala, Sweden.

As a two-dimensional material with high charge carrier mobility, graphene may offer ultrahigh sensitivity in biosensing. To realize this, the first step is to functionalize the graphene. This is commonly done by using 1-pyrenebutyric acid (PBA) as a linker for biomolecules. Read More

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http://dx.doi.org/10.1021/acs.langmuir.6b04237DOI Listing
April 2017
5 Reads

Sensitivity enhancement of graphene/zinc oxide nanocomposite-based electrochemical impedance genosensor for single stranded RNA detection.

Biosens Bioelectron 2017 Aug 27;94:365-373. Epub 2017 Feb 27.

Department of Electrical and Electronic Engineering, Faculty of Engineering, University of Nottingham Malaysia Campus, Jalan Broga, 43500 Semenyih, Selangor, Malaysia; Center of Nanotechnology and Advanced Materials, Faculty of Engineering, University of Nottingham Malaysia Campus, Jalan Broga, 43500 Semenyih, Selangor, Malaysia. Electronic address:

An efficient electrochemical impedance genosensing platform has been constructed based on graphene/zinc oxide nanocomposite produced via a facile and green approach. Highly pristine graphene was synthesised from graphite through liquid phase sonication and then mixed with zinc acetate hexahydrate for the synthesis of graphene/zinc oxide nanocomposite by solvothermal growth. The as-synthesised graphene/zinc oxide nanocomposite was characterised with scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy and X-ray diffractometry (XRD) to evaluate its morphology, crystallinity, composition and purity. Read More

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http://dx.doi.org/10.1016/j.bios.2017.02.038DOI Listing
August 2017
9 Reads

Comparative binding to DR4 and DR5 receptors of TRAIL and BNNTs/PAHE/mPEG-DSPE/TRAIL nanoparticles.

J Mol Recognit 2017 07 25;30(7). Epub 2017 Jan 25.

University of Franche-Comté, Besançon, France.

TRAIL is a member of the tumor necrosis factor family of cytokines, which induces apoptosis of cancer cells, thanks to its binding to its cognate receptors DR5 and DR4. We have recently demonstrated that nanovectorization of TRAIL with single-walled carbon nanotubes enhanced TRAIL affinity to DR5. In this paper, 1-pyrenebutyric acid N-hydroxysuccinimide ester functionalized boron nitride nanotubes (BNNTs) were used to anchor the TRAIL protein. Read More

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http://dx.doi.org/10.1002/jmr.2611DOI Listing
July 2017
7 Reads

A novel electrochemical DNA biosensor based on a modified magnetic bar carbon paste electrode with Fe3O4NPs-reduced graphene oxide/PANHS nanocomposite.

Mater Sci Eng C Mater Biol Appl 2016 Nov 16;68:1-8. Epub 2016 May 16.

Department of Chemistry, Faculty of Science, Yazd University, Yazd, Islamic Republic of Iran. Electronic address:

In this study, we have designed a label free DNA biosensor based on a magnetic bar carbon paste electrode (MBCPE) modified with nanomaterial of Fe3O4/reduced graphene oxide (Fe3O4NP-RGO) as a composite and 1- pyrenebutyric acid-N- hydroxysuccinimide ester (PANHS) as a linker for detection of DNA sequences. Probe (BRCA1 5382 insC mutation detection) strands were immobilized on the MBCPE/Fe3O4-RGO/PANHS electrode for the exact incubation time. The characterization of the modified electrode was studied using different techniques such as scanning electron microscopy (SEM), infrared spectroscopy (IR), vibrating sample magnetometer (VSM), electrochemical impedance spectroscopy (EIS) and cyclic voltammetry methods. Read More

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http://dx.doi.org/10.1016/j.msec.2016.05.056DOI Listing
November 2016
85 Reads

Stimulation of electrocatalytic oxygen reduction activity on nitrogen doped graphene through noncovalent molecular functionalisation.

Chem Commun (Camb) 2016 Aug;52(68):10385-8

Department of Chemistry, Ravenshaw University, Cuttack, Odisha 753003, India.

Molecular doping on graphene, through noncovalent functionalization offers a great opportunity to tune charge density on graphene for catalytic applications. Although enhanced oxygen reduction activity has been reported in heteroatom doped graphene, the synergistic advantage of molecular and heteroatom co-doping has not yet been studied. Here, we report the remarkably enhanced catalytic activity of benzoate or 1-pyrenebutyrate functionalized N-doped graphene (BA-NrGO/PB-NrGO) towards the oxygen reduction reaction (ORR) in alkaline medium. Read More

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http://dx.doi.org/10.1039/c6cc03319aDOI Listing
August 2016
14 Reads

An Easy Access to Organic Salt-Based Stimuli-Responsive and Multifunctional Supramolecular Hydrogels.

Chemistry 2016 Jun 3;22(27):9267-76. Epub 2016 Jun 3.

Department of Organic Chemistry, Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road, Kolkata, 700032, India.

By exploiting orthogonal hydrogen bonding involving supramolecular synthons and hydrophobic/hydrophilic interactions, a new series of simple organic salt based hydrogelators derived from pyrene butyric acid and its β-alanine amide derivative, and various primary amines has been achieved. The hydrogels were characterised by microscopy, table-top rheology and dynamic rheology. FTIR, variable-temperature (1) H NMR and emission spectroscopy established the role of various supramolecular interactions such as hydrogen bonding and π-π stacking in hydrogelation. Read More

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http://dx.doi.org/10.1002/chem.201601136DOI Listing
June 2016
1 Read

Fluorescence Detection of DNA Based on Non-covalent π-π Stacking Interaction between 1-Pyrenebutanoic Acid and Hypericin.

Anal Sci 2016 ;32(5):523-7

School of Environmental and Biological Engineering, Nanjing University of Science & Technology.

Herein, we applied hypericin (Hyp) for the detection of DNA on streptavidin-functionalized magnetic beads (SA-MB) through non-covalent π-π stacking interaction between 1-pyrenebutanoic acid (PBA) and Hyp. Briefly, the target DNA (tDNA) was hybridized to morpholino oligonucleotide (MO) that was immobilized on the surface of SA-MB. PBA was incorporated to the backbone of tDNA by means of phosphate-zirconium-carboxylate coordination reaction. Read More

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http://dx.doi.org/10.2116/analsci.32.523DOI Listing
June 2018
1 Read

Some Aspects of Thermal Transport across the Interface between Graphene and Epoxy in Nanocomposites.

ACS Appl Mater Interfaces 2016 Mar 17;8(12):8272-9. Epub 2016 Mar 17.

School of Computing, Engineering, and Mathematics, Western Sydney University , Locked Bag 1797, Sydney NSW 2751, Australia.

Owing to the superior thermal properties of graphene, graphene-reinforced polymer nanocomposites hold great potential as the thermal interface materials (TIMs) dissipating heat for electronic packages. However, this application is greatly hindered by the high thermal resistance at the interface between graphene and polymer. In this paper, some important aspects of the improvement of the thermal transport across the interface between graphene and epoxy in graphene-epoxy nanocomposites, including the effectiveness of covalent and noncovalent functionalization, isotope doping, and acetylenic linkage in graphene are systematically investigated using molecular dynamics (MD) simulations. Read More

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http://pubs.acs.org/doi/10.1021/acsami.6b00325
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http://dx.doi.org/10.1021/acsami.6b00325DOI Listing
March 2016
9 Reads

Oxidative stress does not play a primary role in the toxicity induced with clinical doses of doxorubicin in myocardial H9c2 cells.

Mol Cell Biochem 2016 Feb 30;413(1-2):199-215. Epub 2016 Jan 30.

Institute of Modeling and Analysis in Geo-Environmental and Health (IMAGES_ESPACE-DEV), University of Perpignan Via Domitia, 66860, Perpignan, France.

The implication of oxidative stress as primary mechanism inducing doxorubicin (DOX) cardiotoxicity is still questionable as many in vitro studies implied supra-clinical drug doses or unreliable methodologies for reactive oxygen species (ROS) detection. The aim of this study was to clarify whether oxidative stress is involved in compliance with the conditions of clinical use of DOX, and using reliable tools for ROS detection. We examined the cytotoxic mechanisms of 2 μM DOX 1 day after the beginning of the treatment in differentiated H9c2 rat embryonic cardiac cells. Read More

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http://dx.doi.org/10.1007/s11010-016-2653-xDOI Listing
February 2016
8 Reads

Synthesis of a Low-Molecular-Weight Fluorescent Ambidextrous Gelator: Development of Graphene- and Graphene-Oxide-Included Gel Nanocomposites.

Chempluschem 2016 Feb 11;81(2):213-221. Epub 2015 Nov 11.

Department of Biological Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata, 700032, India.

Low-molecular-weight fluorescent supramolecular ambidextrous gelators have drawn enormous attention owing to their ever-increasing number of potential applications. In this study, we synthesized a low-molecular-weight fluorescent ambidextrous gelator consisting of hydrophobic pyrenebutyric acid moieties at the N termini of a central l-lysine, and an ethyleneoxy unit coupled with 1-(3-aminopropyl)imidazole via a succinic acid linker as a hydrophilic moiety at the C terminus. This compound showed efficient hydrogelation and organogelation, having minimum gelation concentrations of 0. Read More

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http://dx.doi.org/10.1002/cplu.201500457DOI Listing
February 2016

Preparation and evaluation of reduction-responsive nano-micelles for miriplatin delivery.

Exp Biol Med (Maywood) 2016 06 6;241(11):1169-76. Epub 2016 Jan 6.

Department of pharmaceutics, School of Pharmacy, Qingdao University, Qingdao 266021, China.

A reduction-responsive amphiphilic core-shell micelle for miriplatin delivery was prepared and evaluated. A pyrene-terminated poly(2-(dimethylamino) ethyl acrylate) was synthesized through reversible addition-fragmentation chain transfer polymerization with 4-cyano-4-(ethylthiocarbonothioylthio) pentanoic acid as reversible addition-fragmentation chain transfer reagent and further modified by 2,2'-dithiodiethanol and 1-pyrenebutyric acid. Self-assembled blank micelles and drug-loaded micelles were obtained by dialysis method, and the particle size was proved to be about 40 nm with narrow dispersity by dynamic laser light scattering. Read More

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http://dx.doi.org/10.1177/1535370215625473DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4950310PMC
June 2016
15 Reads
1 Citation

Comparison of impedimetric detection of DNA hybridization on the various biosensors based on modified glassy carbon electrodes with PANHS and nanomaterials of RGO and MWCNTs.

Talanta 2016 Jan 17;147:621-7. Epub 2015 Oct 17.

Department of Biology, Faculty of Science, Yazd University, Yazd, Iran.

In this research, we have developed lable free DNA biosensors based on modified glassy carbon electrodes (GCE) with reduced graphene oxide (RGO) and carbon nanotubes (MWCNTs) for detection of DNA sequences. This paper compares the detection of BRCA1 5382insC mutation using independent glassy carbon electrodes (GCE) modified with RGO and MWCNTs. A probe (BRCA1 5382insC mutation detection (ssDNA)) was then immobilized on the modified electrodes for a specific time. Read More

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http://dx.doi.org/10.1016/j.talanta.2015.10.043DOI Listing
January 2016
90 Reads

Intense charge transfer surface based on graphene and thymine-Hg(II)-thymine base pairs for detection of Hg(2.).

Biosens Bioelectron 2016 Mar 22;77:740-5. Epub 2015 Oct 22.

Key Laboratory of Beijing on Regional Air Pollution Control, Beijing University of Technology, Beijing 100124, China.

In this article, we developed an electrochemiluminescence (ECL) sensor with a high-intensity charge transfer interface for Hg(2+) detection based on Hg(II)-induced DNA hybridization. The sensor was fabricated by the following simple method. First, graphene oxide (GO) was electrochemically reduced onto a glassy carbon electrode through cyclic voltammetry. Read More

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http://dx.doi.org/10.1016/j.bios.2015.10.047DOI Listing
March 2016
4 Reads

Microfluidic White Organic Light-Emitting Diode Based on Integrated Patterns of Greenish-Blue and Yellow Solvent-Free Liquid Emitters.

Sci Rep 2015 Oct 6;5:14822. Epub 2015 Oct 6.

Research Organization for Nano &Life Innovation, Waseda University, 513 Wasedatsurumakicho, Shinjuku, Tokyo 162-0041, Japan.

We demonstrated a novel microfluidic white organic light-emitting diode (microfluidic WOLED) based on integrated sub-100-μm-wide microchannels. Single-μm-thick SU-8-based microchannels, which were sandwiched between indium tin oxide (ITO) anode and cathode pairs, were fabricated by photolithography and heterogeneous bonding technologies. 1-Pyrenebutyric acid 2-ethylhexyl ester (PLQ) was used as a solvent-free greenish-blue liquid emitter, while 2,8-di-tert-butyl-5,11-bis(4-tert-butylphenyl)-6,12-diphenyltetracene (TBRb)-doped PLQ was applied as a yellow liquid emitter. Read More

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http://dx.doi.org/10.1038/srep14822DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4594091PMC
October 2015
8 Reads

Cell Penetrating Peptides for Chemical Biological Studies.

Methods Mol Biol 2015 ;1324:387-96

Nanoscience and Nanotechnology Research Center, Research Organization for the 21st Century, Osaka Prefecture University, Osaka, Japan.

Significant progress has been made in the development of chemical biology methods used to study the molecular behavior and interplay among live cells. These include the development of novel fluorescent molecules and photo-cross-linking agents that can be used to determine the cellular locations of biomacromolecules (including proteins and nucleic acids). Various biosensors utilizing the remarkable ligand-recognition abilities of biomacromolecules have also been developed. Read More

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http://link.springer.com/10.1007/978-1-4939-2806-4_26
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http://dx.doi.org/10.1007/978-1-4939-2806-4_26DOI Listing
April 2016
5 Reads

Tuning Acid-Base Properties Using Mg-Al Oxide Atomic Layer Deposition.

ACS Appl Mater Interfaces 2015 Aug 23;7(30):16573-80. Epub 2015 Jul 23.

†Materials Science Program, and ‡Department of Chemical and Biological Engineering, University of Wisconsin - Madison, Madison, Wisconsin 53706, United States.

Atomic layer deposition (ALD) was used to coat γ-Al2O3 particles with oxide films of varying Mg/Al atomic ratios, which resulted in systematic variation of the acid and base site areal densities. Variation of Mg/Al also affected morphological features such as crystalline phase, pore size distribution, and base site proximity. Areal base site density increased with increasing Mg content, while acid site density went through a maximum with a similar number of Mg and Al atoms in the coating. Read More

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http://dx.doi.org/10.1021/acsami.5b04107DOI Listing
August 2015
5 Reads

Surface modifications for enhanced enzyme immobilization and improved electron transfer of PQQ-dependent glucose dehydrogenase anodes.

Bioelectrochemistry 2015 Oct 14;105:78-87. Epub 2015 May 14.

Department of Chemical and Biological Engineering University of New Mexico, 1 University of New Mexico, Albuquerque, NM 87131, USA.

Pyrroloquinoline quinone dependent soluble glucose dehydrogenase (PQQ-sGDH) enzymatic MWCNT electrodes were p roduced using 1-pyrenecarboxylic acid (PCA) activated through carbodiimide functionalization and 1-Pyrenebutyric acid N-hydroxysuccinimide ester (PBSE) as tethering agents. At 600 mV potential, the current density generated by the activated-PCA tethered PQQ-sGDH anode was significantly greater than the current density generated by the untethered PQQ-sGDH and PBSE tethered anodes, and performance was nearly identical to the performance of a covalently bound PQQ-sGDH anode. A technique for covalently bonding heme-b (hemin), a natural quinohemoprotein porphyrin redox cofactor, to carbon nanotubes modified with arylamine groups is reported. Read More

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http://dx.doi.org/10.1016/j.bioelechem.2015.05.010DOI Listing
October 2015
7 Reads

An in-cell fluorogenic Tag-probe system for protein dynamics imaging enabled by cell-penetrating peptides.

Bioconjug Chem 2015 Jun 15;26(6):1080-5. Epub 2015 May 15.

Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University 2-3-10 Kandasurugadai, Chiyoda-ku, Tokyo 101-0062, Japan.

Fluorogenic probes are useful as molecular tools in chemical biology because they can overcome noise associated with background emission. Previously, using a leucine zipper assembly, we developed a fluorogenically active ZIP tag-probe pair. A probe peptide was designed as an α-helical peptide containing 4-nitrobenzo-2-oxa-1,3-diazole, a solvatochromic fluorescent dye. Read More

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http://pubs.acs.org/doi/10.1021/acs.bioconjchem.5b00131
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http://dx.doi.org/10.1021/acs.bioconjchem.5b00131DOI Listing
June 2015
4 Reads
1 Citation
4.513 Impact Factor

Voltammetric immunosensor assembled on carbon-pyrenyl nanostructures for clinical diagnosis of type of diabetes.

Anal Chem 2015 Mar 23;87(5):2648-54. Epub 2015 Feb 23.

Department of Chemistry, Oklahoma State University , Stillwater, Oklahoma 74078, United States.

Herein we report the first serum insulin voltammetric immunosensor for diagnosis of type 1 and type 2 diabetic disorders. The sensor is composed of multiwalled carbon nanotube-pyrenebutyric acid frameworks on edge plane pyrolytic graphite electrodes (PGE/MWNT/Py) to which an anti-insulin antibody was covalently attached. The detection of picomolar levels of serum insulin binding to the surface antibody was achieved by monitoring the decrease in voltammetric current signals of a redox probe taken in the electrolyte solution. Read More

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http://dx.doi.org/10.1021/acs.analchem.5b00016DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4474482PMC
March 2015
8 Reads

Edge-to-edge interaction between carbon nanotube-pyrene complexes and electrodes for biosensing and electrocatalytic applications.

Phys Chem Chem Phys 2015 Feb;17(6):4025-8

Department of Chemistry, Oklahoma State University, Stillwater, OK 74078, USA.

We demonstrate here that the edge-to-edge interaction between carbon nanotubes (CNTs) and edge plane electrodes plays an important role in exposing a large proportion of the basal planes of the CNTs to allow enhanced π-π stacking of a pyrenyl compound and subsequent high density protein immobilization yielding large electrocatalytic currents. Read More

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http://dx.doi.org/10.1039/c4cp05153jDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4340589PMC
February 2015
6 Reads

Giant enhancement in vertical conductivity of stacked CVD graphene sheets by self-assembled molecular layers.

Nat Commun 2014 Nov 20;5:5461. Epub 2014 Nov 20.

Department of Chemistry, Graphene Research Center, National University of Singapore, 3 Science Drive 3 117543 Singapore, Singapore.

Layer-by-layer-stacked chemical vapour deposition (CVD) graphene films find applications as transparent and conductive electrodes in solar cells, organic light-emitting diodes and touch panels. Common to lamellar-type systems with anisotropic electron delocalization, the plane-to-plane (vertical) conductivity in such systems is several orders lower than its in-plane conductivity. The poor electronic coupling between the planes is due to the presence of transfer process organic residues and trapped air pocket in wrinkles. Read More

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http://dx.doi.org/10.1038/ncomms6461DOI Listing
November 2014
14 Reads

Synthesis and characterisation of multifunctional alginate microspheres via the in situ formation of ZnO quantum dots and the graft of 4-(1-pyrenyl) butyric acid to sodium alginate.

J Microencapsul 2015 29;32(2):129-36. Epub 2014 Sep 29.

Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University , Chengdu , People's Republic of China.

Growth factor-loaded fluorescent alginate microspheres, which can realise sustained growth factor release and fluorescence imaging, were synthesised by in situ formation of ZnO quantum dots (QDs) and covalent graft of 4-(1-pyrenyl) butyric acid (PBA). BSA was chosen as a growth factor model protein to study the release kinetic of growth factors from alginate microspheres. The microsphere size and fluorescent properties were also investigated. Read More

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http://www.tandfonline.com/doi/full/10.3109/02652048.2014.95
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http://dx.doi.org/10.3109/02652048.2014.950712DOI Listing
March 2016
7 Reads

Sensing Reversible Protein-Ligand Interactions with Single-Walled Carbon Nanotube Field-Effect Transistors.

J Phys Chem C Nanomater Interfaces 2014 Aug 11;118(31):17193-17199. Epub 2014 Jul 11.

Department of Chemistry, University of Pittsburgh , Pittsburgh, Pennsylvania 15260, United States.

We report on the reversible detection of CaptAvidin, a tyrosine modified avidin, with single-walled carbon nanotube (SWNT) field-effect transistors (FETs) noncovalently functionalized with biotin moieties using 1-pyrenebutyric acid as a linker. Binding affinities at different pH values were quantified, and the sensor's response at various ionic strengths was analyzed. Furthermore, protein "fingerprints" of NeutrAvidin and streptavidin were obtained by monitoring their adsorption at several pH values. Read More

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http://dx.doi.org/10.1021/jp503670aDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4126736PMC
August 2014
9 Reads
3 Citations
4.772 Impact Factor

Biosensing platform based on graphene oxide via self-assembly induced by synergic interactions.

Anal Biochem 2014 Sep 2;460:16-21. Epub 2014 Jun 2.

School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.

A novel self-assembled glucose biosensor based on graphene oxide (GO) was constructed by using 1-pyrenebutyric acid-N-hydroxysuccinimide ester (PANHS) as linking molecular. The stepwise self-assembly process was performed for PANHS anchoring in N,N-dimethylformamide (DMF) solvent and the further glucose oxidase (GOD) binding in aqueous solution, respectively. The molecular interactions and the morphologic properties were characterized by Fourier transform infrared spectroscopy (FTIR), field emission scanning electronic microscopy (FESEM), and atomic force microscopy (AFM). Read More

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http://dx.doi.org/10.1016/j.ab.2014.05.017DOI Listing
September 2014
7 Reads

Preparation and characterization of multi stimuli-responsive photoluminescent nanocomposites of graphene quantum dots with hyperbranched polyethylenimine derivatives.

Nanoscale 2014 Jul;6(13):7453-60

Department of Chemistry, School of Sciences, Tianjin University and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, P. R. China.

Oxidized graphene sheets (OGS) were treated with a hyperbranched polyethylenimine (PEI) under hydrothermal conditions to generate nanocomposites of graphene quantum dots (GQDs) functionalized with PEI (GQD-PEIs). The influence of the reaction temperature and the PEI/OGS feed ratio on the photoluminescence properties of the GQD-PEIs was studied. The obtained GQD-PEIs were characterized by TEM, dynamic light scattering, elemental analysis, FTIR, zeta potential measurements and (1)H NMR spectroscopy, from which their structural information was inferred. Read More

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http://dx.doi.org/10.1039/c4nr00739eDOI Listing
July 2014
2 Reads

Freezing polystyrene-b-poly(2-vinylpyridine) micelle nanoparticles with different nanostructures and sizes.

Soft Matter 2014 Apr;10(16):2848-55

Department of Chemistry, Renmin University of China, Beijing 100872, P. R. China.

Herein we report how to control the nanostructures and sizes of polystyrene-b-poly(2-vinylpyridine) (PS-b-P2VP) nanoparticles via manipulating freezing in solvent-exchange. By characterizing and analyzing the distinct structural features of the obtained nanoparticles, we recognized that micelle self-assembly happens in the precipitation of PS-b-P2VP when water is added into the block copolymer (BCP) solution. Solvent properties significantly influence micelle types that are vesicles in acetone/H2O and spherical micelles in tetrahydrofuran/H2O, respectively, thus further inducing different frozen nanostructures of the obtained nanoparticles, onion-like in acetone/H2O and large compound micelles in tetrahydrofuran/H2O. Read More

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http://dx.doi.org/10.1039/c3sm53049cDOI Listing
April 2014
17 Reads

Graphene based soft nanoreactors for facile "one-step" glycan enrichment and derivatization for MALDI-TOF-MS analysis.

Talanta 2013 Dec 28;117:1-7. Epub 2013 Aug 28.

School of Life Science and Technology, Beijing Institute of Technology, Beijing 100081, PR China; National Center for Protein Sciences Beijing, State Key Laboratory of Proteomics, Beijing Proteome Research Center, Beijing Institute of Radiation Medicine, Beijing 102206, PR China.

Protein glycosylation is involved in the control of many important biological processes and structural alterations of the N-linked glycans are correlated with various kinds of disease. High-throughput N-glycan profiling is a key technique for elucidating the functions of glycans in biological process and disease development as well as discovering new diagnostic biomarkers. However, the low abundance of glycans existing in living organism, the competition/suppression effect of other highly abundant biological molecules and the inherent lack of alkalinity and hydrophobicity of glycans leads to particularly poor detection sensitivity in MS analysis. Read More

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http://dx.doi.org/10.1016/j.talanta.2013.08.031DOI Listing
December 2013
57 Reads

"Quasi-freestanding" graphene-on-single walled carbon nanotube electrode for applications in organic light-emitting diode.

Small 2014 Mar 29;10(5):944-9. Epub 2013 Oct 29.

Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore.

An air-stable transparent conductive film with "quasi-freestanding" graphene supported on horizontal single walled carbon nanotubes (SWCNTs) arrays is fabricated. The sheet resistance of graphene films stacked via layer-by-layer transfer (LBL) on quartz, and modified by 1-Pyrenebutyric acid N-hydroxysuccinimide ester (PBASE), is reduced from 273 Ω/sq to about 76 Ω/sq. The electrical properties are stable to heat treatment (up to 200 ºC) and ambient exposure. Read More

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http://doi.wiley.com/10.1002/smll.201301829
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http://dx.doi.org/10.1002/smll.201301829DOI Listing
March 2014
5 Reads

Modification of carbon nanotube electrodes with 1-pyrenebutanoic acid, succinimidyl ester for enhanced bioelectrocatalysis.

Methods Mol Biol 2013 ;1051:217-28

Oak Ridge Institute for Science and Education, Oak Ridge, TN, USA.

Conductive materials functionalized with redox enzymes provide bioelectronic architectures with application to biological fuel cells and biosensors. Effective electron transfer between the enzyme (biocatalyst) and the conductive materials is imperative for function. Various nanostructured carbon materials are common electrode choices for these applications as both the materials' inherent conductivity and physical integrity aids optimal performance. Read More

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http://link.springer.com/content/pdf/10.1007/978-1-62703-550
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http://link.springer.com/10.1007/978-1-62703-550-7_14
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http://dx.doi.org/10.1007/978-1-62703-550-7_14DOI Listing
February 2014
46 Reads

Application of graphene-pyrenebutyric acid nanocomposite as probe oligonucleotide immobilization platform in a DNA biosensor.

Mater Sci Eng C Mater Biol Appl 2013 Oct 18;33(7):3851-7. Epub 2013 May 18.

Department of Chemistry and Environment Science, Fujian Province University Key Laboratory of Analytical Science, Zhangzhou Normal University, Zhangzhou 363000, PR China.

A stable and uniform organic-inorganic nanocomposite that consists of graphene (GR) and pyrenebutyric acid (PBA) was obtained by ultrasonication, which was characterized by scanning electron microscopy (SEM) and UV-vis absorption spectra. The dispersion was dropped onto a gold electrode surface to obtain GR-PBA modified electrode (GR-PBA/Au). Electrochemical behaviors of the modified electrode were characterized by cyclic voltammetry and electrochemical impedance spectroscopy using [Fe(CN)6](3-/4-) as the electroactive probe. Read More

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http://dx.doi.org/10.1016/j.msec.2013.05.022DOI Listing
October 2013
9 Reads

Photophysics and energy transfer studies of Alq3 confined in the voids of nanoporous anodic alumina.

J Nanosci Nanotechnol 2013 Apr;13(4):2647-55

Department of Electrical and Computer Engineering, University of Alberta, Edmonton, AB, Canada T6G 2V4.

We report on a hierarchical nanoarchitecture wherein distinct chromophores are deterministically placed at two different types of sites in a nanoporous metal oxide framework. One chromophore, namely Tris(8-hydroxyquinoline)aluminium(III) (Alq3), is embedded in the 1-2 nm sized nanovoids of anodic aluminum oxide (AAO) and another chromophore (carboxyfluorescein or pyrenebutyric acid) is anchored in the form of a monolayer to the surface of the walls of the cylindrical nanopores (- 20 nm in diameter) of AAO. We found the luminescence maximum to occur at 492 nm, blueshifted by at least 18 nm from the value in solutions and thin films. Read More

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http://dx.doi.org/10.1166/jnn.2013.7348DOI Listing
April 2013
43 Reads
1 Citation
1.560 Impact Factor

Effects of pyrenebutyrate on the translocation of arginine-rich cell-penetrating peptides through artificial membranes: recruiting peptides to the membranes, dissipating liquid-ordered phases, and inducing curvature.

Biochim Biophys Acta 2013 Sep 24;1828(9):2134-42. Epub 2013 May 24.

Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan.

Arginine-rich cell-penetrating peptides, including octaarginine (R8) and HIV-1 TAT peptides, have the ability to translocate through cell membranes and transport exogenous bioactive molecules into cells. Hydrophobic counteranions such as pyrenebutyrate (PyB) have been reported to markedly promote the membrane translocation of these peptides. In this study, using model membranes having liquid-ordered (Lo) and liquid-disordered (Ld) phases, we explored the effects of PyB on the promotion of R8 translocation. Read More

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http://dx.doi.org/10.1016/j.bbamem.2013.05.016DOI Listing
September 2013
18 Reads

A novel derivatization-based liquid chromatography tandem mass spectrometry method for quantitative characterization of naphthenic acid isomer profiles in environmental waters.

J Chromatogr A 2013 Jun 25;1293:36-43. Epub 2013 Mar 25.

AXYS Analytical Services Ltd., 2045 Mills Road West, Sidney, British Columbia V8L 5X2, Canada.

A method for quantitative characterization of naphthenic acid (NA) isomer groups by carbon number and extent of cyclization was developed and validated with water samples from northern Alberta. Following solid phase extraction, NAs undergo derivatization with N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide (EDC) allowing detection by positive electrospray ionization tandem mass spectrometry (+ESI)-MS/MS. NA-EDC derivatives produce a common product ion by MS/MS, regardless of structure of the starting NA. Read More

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http://dx.doi.org/10.1016/j.chroma.2013.03.040DOI Listing
June 2013
18 Reads

Novel fluorescent membrane for metronidazole sensing prepared by covalent immobilization of a pyrenebutyric acid derivative.

J Fluoresc 2013 May 8;23(3):599-604. Epub 2013 Mar 8.

College of Chemistry & Chemical Engineering, Xinjiang University, Xinjiang Key Laboratory of Oil and Gas Fine Chemicals, Urumqi, China.

In the present paper, we report the fabrication of a new sensing membrane for fluorescence detection of metronidazole (MNZ). Briefly, a pyrenebutyric acid derivative, 2-(methacryloyloxy) ethyl-4-(1-pyrenyl) butanoate (MPB) with a double bond, was synthesized and copolymerized with 2-hydroxyethylmethacrylate (HEMA) on the activated glass surface by thermal initiation in the presence of cross-linker. The sensor responds linearly to metronidazole in the concentration range of 1. Read More

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http://link.springer.com/10.1007/s10895-013-1176-z
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http://dx.doi.org/10.1007/s10895-013-1176-zDOI Listing
May 2013
4 Reads

Enhanced mechanical properties of epoxy nanocomposites by mixing noncovalently functionalized boron nitride nanoflakes.

Small 2013 Aug 4;9(15):2602-10. Epub 2013 Mar 4.

Department of Material Science and Engineering, Graphene Research Center-GRC, KAIST Institute for the NanoCentury, Korea Advanced Institute of Science and Technology-KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea.

The influence of surface modifications on the mechanical properties of epoxy-hexagonal boron nitride nanoflake (BNNF) nanocomposites is investigated. Homogeneous distributions of boron nitride nanoflakes in a polymer matrix, preserving intrinsic material properties of boron nitride nanoflakes, is the key to successful composite applications. Here, a method is suggested to obtain noncovalently functionalized BNNFs with 1-pyrenebutyric acid (PBA) molecules and to synthesize epoxy-BNNF nanocomposites with enhanced mechanical properties. Read More

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http://doi.wiley.com/10.1002/smll.201203214
Publisher Site
http://dx.doi.org/10.1002/smll.201203214DOI Listing
August 2013
21 Reads