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Phys Chem Chem Phys 2018 Dec 18. Epub 2018 Dec 18.

Universidad Nacional de Colombia - Sede Medellín, Facultad de Ciencias, Escuela de Física, Laboratorio de Fotónica y Optoelectrónica, Calle 59 A No. 63-20, A.A. 3840, Medellín, Colombia.

Time dependent density functional theory has been used to investigate the photochemical and photophysical processes involved in the excited states relaxation of 1- and 2-salicylideneanthrylamine in different solvent environments. This investigation reveals that the pathways involved in the relaxation of the first excited state depend on the solvent polarity. The emission spectrum in acetonitrile and methanol is dominated by the cis-keto tautomers, while in cyclohexane, the spectrum is dominated by the fluorescence emission of the locally excited trans-enol form. Read More

J Am Soc Mass Spectrom 2018 Dec 17. Epub 2018 Dec 17.

Department of Chemistry and Biochemistry, The University of Texas at Arlington, 700 Planetarium Pl., Box 19065, Arlington, TX, 76019-0065, USA.

The relationship between the electrospray ionization (ESI)-mass spectrometric (MS) response of an analyte and its concentration has been well studied for permanently charged and basic analytes in the positive ionization mode, but there has been a lack of research effort for other analytes, and for the negative ionization mode, in general. In this study, this relationship was investigated for various adducts and deprotonated species of glucose, sucrose, and raffinose using a continuous stirred tank reactor (CSTR) coupled with ESI-tandem MS to obtain a continuum of response factors across a wide concentration range in both the positive and negative ionization modes with a single injection under 18 different combinations of solvents and additives. Profiles of response factors vs. Read More

Nat Chem 2018 Dec 17. Epub 2018 Dec 17.

Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, UK.

Aromatic rings are ubiquitous in organic chemistry and form the basis of many commercial products. Despite the numerous routes available for the preparation of aromatic compounds, there remain few methods that allow their conversion into synthetically useful partially saturated derivatives and even fewer that allow new C-C bonds to be formed at the same time. Here we set out to address this problem and uncover a unique catalytic partial reduction reaction that forms partially saturated azaheterocycles from aromatic precursors. Read More

J Chromatogr A 2018 Dec 10. Epub 2018 Dec 10.

Departamento de Medio Ambiente, INIA, Carretera de A Coruña km 7, 28040, Madrid, Spain. Electronic address:

In the present work, the preparation of a new selective molecularly imprinted polymer (MIP) for the family of fluoroquinolones (FQs) in the pores of polypropylene hollow fibers (HFs) is proposed. The resulting MIP-HFs, which combine solid-phase microextraction (SPME) and molecular imprinting technologies, were used to develop a selective microextraction methodology (MIP-HFM) to determine selected FQs danofloxacin, norfloxacin, enrofloxacin and ciprofloxacin in real samples of environmental and biological interest. Measurements during the optimization of the MIP-HFM and its application to the analyses of real samples were performed by HPLC-UV and HPLC-MS/MS. Read More

Molecules 2018 Dec 15;23(12). Epub 2018 Dec 15.

Department of Analytical Chemistry, Faculty of Pharmacy in Hradec Králové, Charles University, Heyrovského 1203, Hradec Králové 50005, Czech Republic.

Food analysis demands fast methods for routine control and high throughput of samples. Chromatographic separation enables simultaneous determination of numerous compounds in complex matrices, several approaches increasing separation efficiency and speed of analysis were involved. In this work, modern types of column with monolithic rod or superficially porous particles were employed and compared for determination of eight synthetic food dyes, their chromatographic performance was evaluated. Read More

Molecules 2018 Dec 15;23(12). Epub 2018 Dec 15.

Ironstone Separations, Inc., Etta, Oxford, MS 38627, USA.

and its diterpene glycosides are one of the main focuses of food companies interested in developing novel zero calorie sugar substitutes since the recognition of steviol glycosides as Generally Recognized as Safe (GRAS) by the United States Food and Drug Administration. Rebaudioside A, one of the major steviol glycosides of the leaves is more than 200 times sweeter than sucrose. However, its lingering aftertaste makes it less attractive as a table-top sweetener, despite its human health benefits. Read More

Toxins (Basel) 2018 Dec 14;10(12). Epub 2018 Dec 14.

Division of Organic Trace and Food Analysis, Department of Analytical Chemistry, Reference Materials, Bundesanstalt für Materialforschung und-prüfung (BAM), Richard-Willstätter-Str. 11, D-12489 Berlin, Germany.

The sensitive detection of the mycotoxin citrinin (CIT) utilizing its fluorescence requires approaches to enhance the emission. In this respect, we studied the complexation of CIT and ochratoxin A (OTA) with Al in methanol using absorption and fluorescence spectroscopy. In this context, an isocratic high performance liquid chromatography (HPLC) method using a polymer column and a fluorescence detector was also developed that enables the separation of the metal ion complexes from the free ligands and non-complexed Al. Read More

Metabolites 2018 Dec 14;8(4). Epub 2018 Dec 14.

NMR Metabolomics Laboratory, Department of Clinical Pharmacy, College of Pharmacy, University of Michigan, Ann Arbor, MI 48109, USA.

Background: Though blood is an excellent biofluid for metabolomics, proteins and lipids present in blood can interfere with 1d-¹H NMR spectra and disrupt quantification of metabolites. Here, we present effective macromolecule removal strategies for serum and whole blood (WB) samples.

Methods: A variety of macromolecule removal strategies were compared in both WB and serum, along with tests of ultrafiltration alone and in combination with precipitation methods. Read More

J Food Sci 2018 Dec 17. Epub 2018 Dec 17.

Dept. of Microbiology and Molecular Biology, Chungnam Natl. Univ., 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea.

In this study, the phenolic components, as well as the antioxidant and antimicrobial activities, of the ripe and unripe fruit of pawpaw (Asimina triloba [L.] Dunal) extracted using five different solvents (distilled water, 95% methanol, 80% methanol, 95% ethanol, and 80% ethanol) were analyzed. The total phenolic content and total flavonoid content were the highest in the 95% ethanol (149. Read More

Pharm Dev Technol 2018 Dec 17:1-33. Epub 2018 Dec 17.

a School of Pharmacy , The University of Jordan , Amman 11942 Jordan.

The ability to control the internal core architecture of polymeric microcapsules has a direct impact on their applications. However, this task, especially to produce microcapsules with a high percentage of mononuclear aqueous cores, proved to be challenging. In this work, and in continuation to our previous studies, we report a facile protocol to prepare poly(D,L-lactide-co-glycolide) (PLGA) microcapsules with unprecedented percentage (almost 100%) of mononuclear aqueous cores by the internal phase separation method via adding alcohols. Read More

ACS Omega 2018 Nov 5;3(11):14833-14840. Epub 2018 Nov 5.

Department of Chemistry, The Research Institute of Natural Sciences, Sookmyung Women's University, 04310 Seoul, Republic of Korea.

Analytical methods based on ultraperformance liquid chromatography/ion-trap mass spectrometry (UPLC/ion-trap MS) were developed for quantification of atractylenolide I, II, and III in the methanol extract of rhizomes with a C column in an acidified water/acetonitrile gradient eluent in an LC system, and ion-trap MS coupled with electrospray ionization was employed under positive-ion mode. The three atractylenolides were quantified in all samples, and the content of atractylenolide I, II, and III showed a significant correlation to each other. Such high correlation was explained by the mechanistic insights into the biosynthetic pathway of atractylenoide III and I from atractylenoide II by using the biomimetic cytochrome P450 model, [Fe(tmp)](CFSO) (tmp = -tetramesitylporphyrin). Read More

ACS Omega 2018 Nov 2;3(11):14779-14787. Epub 2018 Nov 2.

Centro de Investigaciones Químicas, IICBA, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Col. Chamilpa, 62209 Cuernavaca, Morelos, Mexico.

Four compounds, the flavone linarin (), the triterpene lupenone (), the tocopherol (vitamin E, ), and the new natural alkaloid 1,2,3,4-tetrahydro-1,1-dimethyl-6,7-isoquinolindiol (affineine, ), were the major natural products isolated from (syn. , Rutaceae). Compound is highly abundant in this plant and was isolated as a white precipitate obtained from the acetone and methanol extracts. Read More

Data Brief 2018 Dec 17;21:2221-2223. Epub 2018 Nov 17.

Institute of Systems Biology (INBIOSIS), Universiti Kebangsaan Malaysia (UKM), 43600 UKM Bangi, Selangor, Malaysia.

Metabolic regulation is important during seed germination for the establishment of seedling. The germination strategy of mangosteen ( L.) seed is thought to be unique due to its recalcitrant characteristic (sensitive to coldness and drying). Read More

J Chromatogr B Analyt Technol Biomed Life Sci 2018 Dec 8;1105:15-25. Epub 2018 Dec 8.

Shandong University of Traditional Chinese Medicine, Jinan 250355, China. Electronic address:

A simple, sensitive and selective high-performance liquid chromatography electrospray ionization tandem mass spectrometry (HPLC-ESI-MS/MS) method was developed and validated for simultaneous determination and pharmacokinetic study of 15 active compounds (Saikosaponin A, Baicalin, Wogonin, Glycyrrhizic acid, Glycyrrhetinic acid, Albiflorin, Paeoniflorin, Liquiritin, Isoliquiritin, Liquiritigenin, Isoliquiritigenin, Cinnamic acid, Gallic acid, Wogonoside and Oroxylin A) in rat plasma. After a feasible protein precipitation using methanol for sample preparation, chromatographic separation was carried out with a Halo® C column (2.1 × 100 mm, 2. Read More

Sci Rep 2018 Dec 14;8(1):17849. Epub 2018 Dec 14.

Department of Chemical Thermodynamics and Kinetics, Saint Petersburg State University, Saint Petersburg, 198504, Russia.

Polymer membranes with improved transport properties are required for effective separation of organic mixtures (such as methanol‒hexane system) by combination of pervaporation and azeotropic distillation. The present work is devoted to comparative study of two types of membranes based on poly(amidoimide acid) with 2,2'-biquinoline-6,6' units in the backbone; the objects were prepared (i) from the initial polymer and (ii) from the polymer-metal complex (with Cu(I)). Thermo-mechanical and mass spectrometric investigations demonstrated good operational properties of the samples. Read More

Biomed Pharmacother 2019 Jan 1;109:2482-2491. Epub 2018 Dec 1.

University of Belgrade, Faculty of Biology, Studentski trg 16, 11000 Belgrade, Serbia.

The objective of this study was to evaluate potential of two chemically characterized edible wild onion species, Allium flavum and Allium carinatum, to reduce side effects of cytostatic doxorubicin (Dox). Since Dox application is mainly limited due to its high cardiotoxicity, while there are no approved cardioprotective agents for the prevention of Dox adverse effects, new co-treatments are urgently needed. Here, we showed that methanol extracts expressed high antioxidant activity and synergistically increased Dox anticancer activity against human hepatoma (HepG2) and lung carcinoma (A549) cells, while protected normal human fibroblasts (MRC-5) from Dox cytotoxicity. Read More

Biomed Pharmacother 2019 Jan 15;109:1602-1609. Epub 2018 Nov 15.

Department of Pathology, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, 110 029, India.

Calotropis procera, a latex producing plant is known to possess medicinal properties including its beneficial effect in gastrointestinal disorders. The anti-inflammatory effect of its latex in various experimental models is noteworthy and in light of this the present study was carried out with an objective to evaluate its efficacy in ulcerative colitis, an inflammatory condition of the colon. Colitis was induced in rats by acetic acid and the rats were divided into four groups where one group served as experimental control and the other groups were treated with two doses of methanol extract of dried latex of C. Read More

Biomed Pharmacother 2019 Jan 9;109:1313-1318. Epub 2018 Nov 9.

School of Pharmacy, Sungkyunkwan University, Suwon, 16419, Republic of Korea. Electronic address:

Estrogenic activity-oriented fractionation and purification of methanol extract from the rhizome of Cyperus rotundus, a well-known traditional herbal medicine, led to the isolation of six sesquiterpenes. 4α,5α-Oxidoeudesm-11-en-3-one (2) and cyper-11-ene-3,4-dione (3) together with four known sesquiterpenes, cyperotundone (1), caryophyllene α-oxide (4), α-cyperone (5), and isocyperol (6) were obtained from the hexane and dichloromethane fractions. Compounds 2 and 3 were newly isolated from natural resources in particular. Read More

Inorg Chem 2018 Dec 14. Epub 2018 Dec 14.

High Pressure Science and Engineering Center , University of Nevada, Las Vegas , Las Vegas , Nevada 89154 , United States.

Zirconium disilicide (ZrSi) has been investigated experimentally and theoretically for its structural and physical properties at high pressures. In situ compression experiments demonstrate that at low pressure, ZrSi adopts the C49 structure (space group Cmcm), which persists up to 54.5 GPa at room temperature, and the unit cell of ZrSi along b-axis is at least twice as compressible as along a- and c-axis. Read More

J Phys Chem B 2018 Dec 14. Epub 2018 Dec 14.

Department of Applied Chemistry, Graduate School of Science and Engineering , Doshisha University , Kyotanabe , Kyoto 610-0321 , Japan.

Excited-state proton transfer (ESPT) of 5,8-dicyano-2-naphthol (DCN2) in methanol at 30 MPa isobar between 294 and 543 K was studied using time-resolved fluorescence spectroscopy. From room temperature up to 513 K, a fluorescence band from an anionic form (RO*, a proton dissociated form of DCN2) was observed, which indicates that the ESPT occurred under these thermal conditions. The time profiles of fluorescence intensity of the normal form of DCN2 (ROH*) (proton-associated form of DCN2) and RO* were analyzed, considering the diffusion process of the contact ion pair RO*···H in the Coulomb field based on the Debye-Smoluchowski theory. Read More

IUBMB Life 2018 Dec 13. Epub 2018 Dec 13.

Interdepartmental Laboratory for Electron Microscopy, Roma Tre University, Roma, Italy.

In the "Hypothesis" paper entitled "Lanthanides-Based Catalysis in Eukaryotes" (IUBMB Life 2018 Nov;70(11):1067-1075), we analyzed the possibility that Ce -dependent methanol dehydrogenases (MDHs) could be found not only in archaea and bacteria but also in eukaryotic organisms. This hypothesis was based on the observation that MDHs protein sequences carrying the signature of Ce -based active sites could be found in genome-derived proteomes of the eukaryotes Plasmodium yoelii yoelii, Nephila clavipes, Hyalella azteca, Pantholops hodgsonii, and Homo sapiens. Data were analyzed following standard procedures employed in the study of phylogenetic relationships among members of protein families and their occurrence in diverse organisms. Read More

Phytochem Anal 2018 Dec 11. Epub 2018 Dec 11.

Department of Entomology, University of Wisconsin-Madison, Madison, WI, USA.

Introduction: Condensed tannins (CTs) are proanthocyanidin heteropolymers that are widely distributed among plants. Their biochemical properties are determined by molecular structure (e.g. Read More

Opt Lett 2018 Dec;43(24):5933-5936

A multimode self-mixing terahertz-frequency gas absorption spectroscopy is demonstrated based on a quantum cascade laser. A double-metal device configuration is used to expand the laser's frequency tuning range, and a precision-micromachined external waveguide module is used to enhance the optical feedback. Methanol spectra are measured using two laser modes at 3. Read More

Molecules 2018 Dec 11;23(12). Epub 2018 Dec 11.

Department of Pharmacy Practice, University of Nebraska Medical Center, Omaha, NE 68198, USA.

Isoprenoids (IsoP) are an important class of molecules involved in many different cellular processes including cholesterol synthesis. We have developed a sensitive and specific LC-MS/MS method for the quantitation of three key IsoPs in bio-matrices, geranyl pyrophosphate (GPP), farnesyl pyrophosphate (FPP), and geranylgeranyl pyrophosphate (GGPP). LC-MS/MS analysis was performed using a Nexera UPLC System connected to a LCMS-8060 (Shimadzu Scientific Instruments, Columbia, MD) with a dual ion source. Read More

Molecules 2018 Dec 9;23(12). Epub 2018 Dec 9.

Department of Inorganic Chemistry, Faculty of Chemistry, University of Bucharest, 90⁻92 Panduri Str., 050663 Bucharest, Romania.

Five new copper(II) acrylate complexes (acr is the acrylate anion: C₃H₃O₂) with imidazole derivatives (2-methylimidazole/2-MeIm, 5-methylimidazole/5-MeIm, 2-ethylimidazole/2-EtIm) of type: -[Cu(2-RIm)₂(acr)₂]·xH₂O ((): R = ⁻CH₃, x = 2; (): R = ⁻CH₂⁻CH₃, x = 0), -[Cu(2-RIm)₂(acr)₂] ((): R = ⁻CH₃; (): R = ⁻CH₂⁻CH₃) and -[Cu(5-RIm)₂(acr)₂] ((): R = ⁻CH₃) have been prepared and characterized by elemental analysis, Fourier Transform Infrared spectrometry (FTIR), Electron Paramagnetic Resonance (EPR), electronic reflectance spectroscopy, scanning electron microscopy, and mass spectrometry. The single crystal X-ray diffraction study of complexes () and () reveals that the copper(II) ion is located on an inversion center and show elongated octahedral geometry completed by two coplanar bidentate acrylates and two unidentate imidazole derivatives displayed in positions. For complex () the single crystal X-ray diffraction shows that the copper(II) ion is in a distorted octahedral environment which can be easily confused with a trigonal prism completed by two bidentate acrylates and two unidentate imidazole derivatives displayed in positions. Read More

Mar Drugs 2018 Dec 7;16(12). Epub 2018 Dec 7.

Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali (ChiBioFarAm), University of Messina, Viale Ferdinando Stagno d'Alcontres 31, 98168 Messina, Italy.

Enormous marine biodiversity offers an endless reservoir of chemicals for many applications. In this scenario, the extraction of seaweeds represents an interesting source of compounds displaying antimicrobial activity. In particular, among the different red algae, plays an important role due to the presence of important bioactives in its composition. Read More

Molecules 2018 Dec 7;23(12). Epub 2018 Dec 7.

Institute of Pharmacy and Molecular Biotechnology, Heidelberg University, 44883-2462 Heidelberg, Germany.

Reactive oxygen species (ROS) have been linked to several health conditions, among them inflammation. Natural antioxidants may attenuate this damage. Our study aimed to investigate the chemical composition of a methanol leaf extract from and its possible antioxidant, anti-inflammatory, anti-nociceptive, and antipyretic effects. Read More

Molecules 2018 Dec 7;23(12). Epub 2018 Dec 7.

College of Pharmacy, Liaoning University of Traditional Chinese Medicine, Dalian 116000, China.

Atractylodis Rhizoma is the dried rhizome of (Thunb.) DC. or (DC. Read More

Molecules 2018 Dec 7;23(12). Epub 2018 Dec 7.

Department of Legal Medicine, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan.

A simple, sensitive, and rapid extraction method based on high-frequency (H-F) heating was developed for drug analysis in human nails. A human nail was placed in a glass tube with an extraction solvent (methanol and 0.1% formic acid; 7:3, /), and a ferromagnetic alloy (pyrofoil) was wrapped in a spiral around the glass tube. Read More

J Ethnopharmacol 2018 Dec 10. Epub 2018 Dec 10.

Departamento de Química, Universidade Federal de Santa Maria,Santa Maria, RS, Brazil. Electronic address:

Ethnopharmacology Relevance: Discaria americana Gillies ex Hook (sin. Discaria febrifuga and Discaria longispina) (Rhamnaceae) is a plant native from Rio Grande do Sul (Southern Brazil), Uruguay and Argentine, and has been used in Brazilian traditional medicine as antipyretic agent, and for stomach disorders. In Rio Grande do Sul, Uruguay and Argentine, the roots, in decoction, are used as tonic and febrifuge. Read More

ACS Nano 2018 Dec 13. Epub 2018 Dec 13.

The fabrication of thin films comprising ordered nanowire assemblies with emerging, precisely defined properties and adjustable functionalities enables highly integrated technologies in the fields of microelectronics and micro system technology, as well as for efficient power generation, storage, and utilization. Shear force, theoretically, is deemed as the most promising method for obtaining in-plane, uniaxial thin films comprising nanowires. The success depends largely on the assembly process, and uniform structural control throughout multiple length scales can be achieved only if the rational strategy is executed. Read More

Front Microbiol 2018 27;9:2735. Epub 2018 Nov 27.

Biology Department, Viral Information Institute, San Diego State University, San Diego, CA, United States.

Rare Earth Elements (REEs) control methanol utilization in both methane- and methanol-utilizing microbes. It has been established that the addition of REEs leads to the transcriptional repression of MxaFI-MeDH [a two-subunit methanol dehydrogenase (MeDH), calcium-dependent] and the activation of XoxF-MeDH (a one-subunit MeDH, lanthanum-dependent). Both enzymes are pyrroquinoline quinone-dependent alcohol dehydrogenases and show significant homology; however, they display different kinetic properties and substrate specificities. Read More

Sci Rep 2018 Dec 12;8(1):17782. Epub 2018 Dec 12.

Department of Environmental Health Sciences, Konkuk University, Seoul, 143-701, Korea.

Aloe vera (AV) is popular and has been commercialized as a beauty product, laxative, herbal medicine, the antimicrobial activity of AV is proven. The antiviral activity of AV however, has not been well documented except for a handful reports. Till date extraction of AV compounds is popularized using organic solvents, since the active components are effectively extracted in methanol. Read More

J Phys Chem A 2018 Dec 13. Epub 2018 Dec 13.

Steady-state and time-resolved fluorescence techniques were used to study the excited-state proton transfer (ESPT) from an irreversible photoacid, 1-naphthol-3,6-disulfonate (1NP36DS), to methanol-water mixtures. We found that at χwater=0.3 the ESPT rate constant is higher by a factor of ten that in neat methanol. Read More

Nanoscale 2018 Dec 7. Epub 2018 Dec 7.

Department of Physics, Indian Institute of Technology Madras, Chennai-600 036, India.

The swelling of electrically conducting polymer films upon absorption of vapors like alcohol or moisture is widely known. However, this swelling leads to feeble changes in charge transport characteristics. We demonstrate a colossal enhancement (from ∼6% to 108%) in the vapor-induced resistance change for a representative system, poly(3,4-ethylene dioxythiophene) polystyrene sulfonate (PEDOT:PSS). Read More

Nanotechnology 2018 Nov 29. Epub 2018 Nov 29.

Applying Chemistry Key Lab of Hebei Province,College of Environmental and Chemical Engineering, Yanshan University, No.438 Hebei Street, Qinhuangdao 066004, Qinhuangdao, CHINA.

Due to the dependence of the morphology, size and composition of Pt-based nanomaterials on their catalytic properties, rational design can improve the utilization efficiency and catalytic performance of Pt. As inspired by this, the ultra-long Pt nanowires (ULPtNWs) with a diameter of 25 nm were prepared by a mild, green, direct peptide mediated biological template method. Impressively, the large electrochemically active surface area (57. Read More

PLoS One 2018 12;13(12):e0207574. Epub 2018 Dec 12.

Department of Operative Dentistry and Periodontology, Medical Center, University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany.

In light of the growing antibiotic resistance, the usage of plant-derived antimicrobial agents could serve as an effective alternative treatment against oral infections. The aim of this study was to investigate the antimicrobial and antibiofilm activity of Mediterranean herb extracts against representative oral microorganisms. The extraction procedures and the analysis of the obtained extracts were performed under established experimental conditions. Read More

Phys Chem Chem Phys 2018 Dec 12. Epub 2018 Dec 12.

Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India. and Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India.

We report that the Z-type binding rather than X-type binding was favored when 8-hydroxyquinoline (HQ) reacted with presynthesized ZnS quantum dots (Qdots) to form surface zinc quinolinate complexes having a preferred stoichiometry of 1 : 2 (surface Zn2+ : HQ). Importantly, the higher solubility in polar solvents and high desorption coefficient (following Langmuir binding isotherm) of HQ-treated ZnS Qdot in DMSO solvent compared with those in methanol clearly indicated the favorable Z-type binding of HQ and thus the formation of surface octahedral ZnQ2 complex. Furthermore, the characteristics peaks in the 1H-nuclear magnetic resonance (NMR) spectrum of the desorbed species and the ligand density calculation of the surface complex (formed due to the reaction between HQ and ZnS Qdot) supported the octahedral ZnQ2 complex formation. Read More

ACS Appl Mater Interfaces 2018 Dec 12. Epub 2018 Dec 12.

The breakthrough of non-precious metal catalysts replacing platinum-based catalysts towards the oxygen reduction reaction (ORR) is extremely urgent for the development of high-efficiency energy conversation systems. Herein, a solution-processed condensation polymerization using cyanuric chloride and piperazine as the monomers was proposed for synthesis of a nitrogen-rich covalent organic polymer (COP). High contents of precisely tailored pyridinic-N within the COP facilitate the formation of the Co-N coordination between Co ions and N species. Read More

Biomed Res Int 2018 13;2018:3069595. Epub 2018 Nov 13.

Laboratory of Blue Biotechnology and Aquatic Bioproduction (B3 Aqua), National Institute of Marine Sciences and Technologies (INSTM), 28, 2 march street 1934 -2035 Salammbô, Tunisia.

This study deals with the antimicrobial potential assessment of in regard to collection period and sampling site. Besides, we assess the chemical composition of bioactive compounds. For this purpose, was seasonally collected from two northern sites in Tunisia, Cap Zebib rocky shore (CZ) and Ghar El Melh lagoon (GEM). Read More

J Anal Methods Chem 2018 13;2018:9462019. Epub 2018 Nov 13.

School of Chemical Engineering, Hanoi University of Science and Technology, 1 Dai Co Viet, Hai Ba Trung, Hanoi 100000, Vietnam.

A high-performance liquid chromatography (HPLC) in combination with inductively coupled plasma mass spectrometry (ICP-MS) as an elemental specific detector was used for the speciation analysis of arsenic compounds in urine and serum samples from Vietnam. Five arsenic species including arsenite (As), arsenate (As), monomethylarsonic acid (MMA), dimethylarsinic acid (DMA), and arsenobetaine (AsB) were studied. A gradient elution of ammonium carbonate ((NH)CO), ethylenediaminetetraacetic acid disodium salt (NaEDTA), and methanol at pH 9. Read More

Evid Based Complement Alternat Med 2018 13;2018:4918090. Epub 2018 Nov 13.

Laboratorio de Farmacognosia, UBIPRO Facultad de Estudios Superiores-Iztacala UNAM, Tlalnepantla, Edo. Mex., Mexico.

In the Valley of Tehuacan-Cuicatlan, and are located and are used in traditional medicine. In this research, several biological properties were evaluated. The methanol extracts of (MeCp) and (MeBm) were obtained by maceration. Read More

Evid Based Complement Alternat Med 2018 14;2018:3034612. Epub 2018 Nov 14.

Department of Biological and Preclinical Studies, Institute of Traditional Medicine, Muhimbili University of Health and Allied Sciences, P.O. Box 65001, Dar es Salaam, Tanzania.

Background: Inadequate specialized cancer hospitals and high costs are contributing factors that delay cancer patients from accessing health care services in Tanzania. Consequently, majority of patients are first seen by Traditional Health Practitioners (THPs) before they access specialized services. This study presents ethnomedical information and preliminary evaluation of 25 plant species claimed by THPs in Mkuranga and Same districts of Tanzania on use for treatment of cancer. Read More

Dalton Trans 2018 Dec 7. Epub 2018 Dec 7.

Key Laboratory for Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Wuhan 430073, P. R. China.

Two novel metal-organic framework (MOF) photocatalysts with different structures [(Cu(H2L)(4,4'-bipy)0.5(H2O)] (1) and [Co(C14H14O6.5P2)(4,4'-bipy)0. Read More

Angew Chem Int Ed Engl 2018 Dec 7. Epub 2018 Dec 7.

Shandong Normal University, No.88 Wenhua East Road, Jinan, CHINA.

Long afterglow materials can store and release light energy after illumination. Here, a brick-like, micron-sized Sr2MgSi2O7:Eu2+,Dy3+ long afterglow material is used for hydrogen production via the photocatalytic reforming of methanol under round-the-clock conditions for the first time, achieving a solar-to-hydrogen (STH) conversion efficiency of 5.18%. Read More

Biomed Chromatogr 2018 Dec 7:e4451. Epub 2018 Dec 7.

Department of Chemistry, GITAM University, Hyderabad, India.

A highly sensitive, specific and rapid Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS) analytical method has been developed and validated for the determination of ospemifene in human plasma using ospemifene-d as an internal standard. Solid phase extraction (SPE) technique with Phenomenex Strata X-33μM polymeric sorbent cartridges (30 mg/1ml) was used to extract the analytes from the plasma. The chromatographic separation was achieved on Agilent Eclipse XDB-Phenyl, 4. Read More

Biomed Chromatogr 2018 Dec 7:e4456. Epub 2018 Dec 7.

Department of Analytical Chemistry, School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, PR China.

A rapid, selective and sensitive ultra high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) method was developed to simultaneously determine oxybutynin (OB) and its active metabolite N-desethyl oxybutynin (DEOB) in rat plasma. Sample of 0.1 mL plasma was extracted with n-hexane. Read More

Mol Biol Rep 2018 Dec 7. Epub 2018 Dec 7.

Laboratory of Microbial Biotechnology and Engineering Enzymes (LMBEE), Centre of Biotechnology of Sfax (CBS), University of Sfax, Sidi Mansour Road Km 6, P.O. Box 1177, 3018, Sfax, Tunisia.

A synthetic cDNA-AmyA gene was cloned and successfully expressed in Pichia pastoris as a His-tagged enzyme under the methanol inducible AOX1 promoter. High level of extracellular amylase production of 72 U/mL was obtained after a 72 h induction by methanol. As expected, the recombinant strain produced only the AmyA isoform since the host is a protease deficient strain. Read More

Int Arch Occup Environ Health 2018 Dec 10. Epub 2018 Dec 10.

Department of Preventive Medicine, Institute Occupational and Environmental Medicine, Yonsei University Wonju College of Medicine, Wonju, South Korea.

Purpose: Recently, the international agency for research on cancer recommended that methanol should be recognized as a medium-priority, human cancer risk. Therefore, we performed an epidemiological study to evaluate the relationship between methanol exposure and the cancer mortality of Korean workers occupationally exposed to methanol.

Methods: The study cohort was composed of methanol-exposed 25,218 male workers, data on whom were available from the Korea Occupational Safety and Health Agency; all participants underwent methanol-associated medical check-ups at least once between January 2000 and December 2004. Read More