25,231 results match your criteria properties probe


Label-free and reagentless electrochemical genosensor based on graphene acid for meat adulteration detection.

Biosens Bioelectron 2021 Sep 12;195:113628. Epub 2021 Sep 12.

Catalan Institute of Nanoscience and Nanotechnology, Autonomous University of Barcelona, 08193, Bellaterra, Barcelona, Spain. Electronic address:

With the increased demand for beef in emerging markets, the development of quality-control diagnostics that are fast, cheap and easy to handle is essential. Especially where beef must be free from pork residues, due to religious, cultural or allergic reasons, the availability of such diagnostic tools is crucial. In this work, we report a label-free impedimetric genosensor for the sensitive detection of pork residues in meat, by leveraging the biosensing capabilities of graphene acid - a densely and selectively functionalized graphene derivative. Read More

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September 2021

Sticking Effect of a Tackifier on the Fibrillation of Acrylic Pressure-Sensitive Adhesives.

Langmuir 2021 Sep 20. Epub 2021 Sep 20.

LINTEC Corporation, 5-14-42 Nishiki-cho, Warabi-shi, Saitama 335-0005, Japan.

In this study, the effect of a tackifier on the viscoelastic and adhesion properties of acrylic pressure-sensitive adhesives (PSAs) was investigated. The intermediate products in the process of PSA synthesis, including an acrylate-based copolymer solution, a cross-linked copolymer, and the final product with a tackifier, were prepared and characterized using dynamic mechanical analysis (DMA). A significant increase in storage and loss moduli at high angular velocities was observed for the final product with the tackifier. Read More

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September 2021

Detection of organophosphorus pesticides: exploring oxime as a probe with improved sensitivity by CeO-modified electrode.

Anal Methods 2021 Sep 20. Epub 2021 Sep 20.

MEMS Center, Harbin Institute of Technology, Harbin 150001, China.

In this paper, the catalytic activity of CeO NPs toward oxime oxidation was adopted for the first time to develop an electrochemical sensor with improved sensitivity toward the direct detection of organophosphorus pesticides (OPs) without electrochemical redox activity. To enhance the conductivity of the sensor, CeO NPs together with multi-walled carbon nanotubes (MWCNTs) were deposited onto a bare glassy carbon electrode (GCE) by the simple method of drop-casting. The electrochemical properties of the as-prepared sensor were evaluated in K[Fe(CN)] solution and the oxidation behavior of pralidoxime (PAM) chloride on the electrodes was characterized by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Read More

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September 2021

Boron-Mediated Grain Boundary Engineering Enables Simultaneous Improvement of Thermoelectric and Mechanical Properties in N-Type Bi Te.

Small 2021 Sep 19:e2104067. Epub 2021 Sep 19.

Institute of Physics IA, RWTH Aachen University, 52056, Aachen, Germany.

Powder metallurgy introduces small structures of high-density grain boundaries into Bi Te -based alloys, which promises to enhance their mechanical and thermoelectric performance. However, due to the strong donor-like effect induced by the increased surface, Te vacancies form in the powder-metallurgy process. Hence, the as-sintered n-type Bi Te -based alloys show a lower figure of merit (ZT) value than their p-type counterparts and the commercial zone-melted (ZM) ingots. Read More

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September 2021

Micromechanical mapping of the intact ovary interior reveals contrasting mechanical roles for follicles and stroma.

Biomaterials 2021 Sep 3;277:121099. Epub 2021 Sep 3.

Department of Materials, Imperial College London, Exhibition Road, London, SW7 2AZ, UK. Electronic address:

Follicle development in the ovary must be tightly regulated to ensure cyclical release of oocytes (ovulation). Disruption of this process is a common cause of infertility, for example via polycystic ovary syndrome (PCOS) and premature ovarian insufficiency (POI). Recent ex vivo studies suggest that follicle growth is mechanically regulated, however, crucially, the actual mechanical properties of the follicle microenvironment have remained unknown. Read More

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September 2021

Highly Stable Fluorescent Probe Based on Mesoporous Silica Coated Quantum Dots for Sensitive and Selective Detection of Cd2.

Nanotechnology 2021 Sep 18. Epub 2021 Sep 18.

School of Materials Science and Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan 430070, P.R. China, Wuhan, 430070, CHINA.

Cadmium ions have been of crucial concern due to the high biological toxicity and serious environmental risks.Various fluorescent Cd-sensitive probes have been reported with improved sensing properties, but still severely suffer from poor stability and insufficient selectivity. In this work, a stable fluorescent probe based on silica encapsulated quantum dots (QDs) have been developed for rapid, sensitive and selective detection of cadmium ion. Read More

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September 2021

Non-invasive and accurate readout of superoxide anion in biological systems by near-infrared light.

Anal Chim Acta 2021 Sep 5;1179:338827. Epub 2021 Jul 5.

Graduate School of Bioresources, Mie University, 1577 Kurimamachiya, Tsu, Mie, 514-8507, Japan. Electronic address:

Infectious and inflammatory diseases involve superoxide anion (O) production. Real-time and non-invasive evaluation of O in intact biological systems has been a significant challenge in biology and medicine. Here, I report that an advanced near-infrared chemiluminescent probe, MCLA-800, enables reliable non-invasive optical readout of Oex vivo and in vivo. Read More

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September 2021

Temperature-dependent dielectric properties of human uterine fibroids over microwave frequencies.

Biomed Phys Eng Express 2021 Sep 17. Epub 2021 Sep 17.

Electrical and Computer Engineering, Kansas State University College of Engineering, 3108 Engineering Hall Manhattan, Kansas 66506-5200, Manhattan, Kansas, 66506-5201, UNITED STATES.

Microwave ablation is under investigation as a minimally-invasive treatment for uterine fibroids. Computational models play a vital role in the development, evaluation and characterization of candidate ablation devices. The temperature-dependent dielectric properties of fibroid tissue are essential for accurate computational modeling. Read More

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September 2021

Strain-Induced Alternating Photoluminescence Segmentation in Hexagonal Monolayer Tungsten Disulfide Grown by Physical Vapor Deposition.

ACS Appl Mater Interfaces 2021 Sep 17. Epub 2021 Sep 17.

College of Advanced Interdisciplinary Studies & Hunan Provincial Key Laboratory of Novel Nano-Optoelectronic Information Materials and Devices, National University of Defense Technology, Changsha, Hunan 410073, China.

Two-dimensional semiconductors exhibit strong light emission under optical or electrical pumping due to quantum confinement and large exciton binding energies. The regulation of the light emission shows great application potential in next-generation optoelectronic devices. Herein, by the physical vapor deposition strategy, we synthesize monolayer hexagonal-shaped WS, and its photoluminescence intensity mapping show three-fold symmetric patterns with alternating bright and dark regions. Read More

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September 2021

Unexpected phosphorus doping routine of planar silicon nanowires for integrating CMOS logics.

Nanoscale 2021 Sep 17;13(35):15031-15037. Epub 2021 Sep 17.

School of Electronics Science and Engineering/National Laboratory of Solid-State Microstructures, Nanjing University, 210093 Nanjing, P. R. China.

Complementary doping control in silicon nanowire (SiNW) channels is crucial for the construction of high-performance CMOS logics. Though planar in-plane solid-liquid-solid (IPSLS) growth, with an amorphous Si (a-Si) thin film as a precursor, has demonstrated a precise and scalable integration of orderly SiNWs, a complementary and tunable n-type doping has not been accomplished. This has been hindered by the fact that the phosphorus (P) gas dopants will react with the indium (In) catalyst droplet to form insoluble InP precipitates. Read More

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September 2021

Ultrasensitive colorimetric strategy for Hg detection based on T-Hg-T configuration and target recycling amplification.

Anal Bioanal Chem 2021 Sep 16. Epub 2021 Sep 16.

School of Marine Science and Technology, Harbin Institute of Technology, Weihai, 264209, People's Republic of China.

A novelty aptasensor for ultrasensitive detection of Hg is developed, exploiting the combination of plasmonic properties of gold nanoparticles (AuNPs) and exonuclease III (Exo III)-assisted target recycling for signal amplification. In the presence of Hg, a DNA duplex can be formed due to the strong coordination of Hg and T bases of single-stranded DNA (ssDNA) probe. Exo III digests the DNA duplex from the 3' to 5' direction, resulting in the releasing of Hg. Read More

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September 2021

A fluorescent probe for rapid detection of low concentration mercury ions and its application in biological cells.

Anal Methods 2021 Sep 16;13(35):3987-3993. Epub 2021 Sep 16.

Department of Pharmacy, Jiangsu Key Laboratory for Pharmacology and Safety Evaluation of Chinese Materia Medica, Nanjing University of Chinese Medicine, 138 Xianlin Dadao, Nanjing 210023, China.

As a toxic substance, mercury can easily cause harm to organisms and humans. The development of methods that allow rapid detection of low concentrations of mercury ions has a positive effect on the natural environment and human health. The fluorescent probe RBSH reported in this paper has a detection limit as low as 5. Read More

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September 2021

Structure and surface properties of size-tuneable CsPbBr nanocrystals.

Nanoscale 2021 Sep 16. Epub 2021 Sep 16.

School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Drive, Singapore, 637553, Republic of Singapore.

This investigation has characterised the structure and surface chemistry of CsPbBr nanocrystals with controlled diameters between 6.4 to 12.8 nm. Read More

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September 2021

Evidence of two-dimensional flat band at the surface of antiferromagnetic kagome metal FeSn.

Nat Commun 2021 Sep 15;12(1):5345. Epub 2021 Sep 15.

Department of Physics, Massachusetts Institute of Technology, Cambridge, MA, USA.

The kagome lattice has long been regarded as a theoretical framework that connects lattice geometry to unusual singularities in electronic structure. Transition metal kagome compounds have been recently identified as a promising material platform to investigate the long-sought electronic flat band. Here we report the signature of a two-dimensional flat band at the surface of antiferromagnetic kagome metal FeSn by means of planar tunneling spectroscopy. Read More

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September 2021

Full spectrum 2D IR spectroscopy reveals below-gap absorption and phonon dynamics in the mid-IR bandgap semiconductor InAs.

J Chem Phys 2021 Sep;155(10):104202

Physical Chemistry II, Faculty of Chemistry and Biochemistry, Ruhr-University Bochum, Bochum, Germany.

While the mid-infrared spectral region spans more than 3000 cm, ultrafast mid-IR spectroscopies are normally limited to the spectral bandwidth that can be generated in optical parametric amplifiers-typically a few hundred cm. As such, the spectral coverage in conventional two dimensional infrared (2D IR) spectroscopy captures only about 1% of the full potential 2D mid-IR spectrum. Here, we present 2D IR spectra using a continuum source as both the excitation and probe pulses, thus capturing close to the full 2D IR spectrum. Read More

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September 2021

Indentation responses of pressurized ellipsoidal and cylindrical elastic shells: Insights from shallow-shell theory.

Phys Rev E 2021 Aug;104(2-2):025004

Institute for Fundamental Science and Department of Physics, University of Oregon, Eugene, Oregon 97403, USA.

Pressurized elastic shells are ubiquitous in nature and technology, from the outer walls of yeast and bacterial cells to artificial pressure vessels. Indentation measurements simultaneously probe the internal pressure and elastic properties of thin shells and serve as a useful tool for strength testing and for inferring internal biological functions of living cells. We study the effects of geometry and pressure-induced stress on the indentation stiffness of ellipsoidal and cylindrical elastic shells using shallow-shell theory. Read More

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Ratiometric Fluorescence Imaging of Intracellular MicroRNA with NIR-Assisted Signal Amplification by a [email protected] Nanoplatform.

ACS Appl Mater Interfaces 2021 Sep 15. Epub 2021 Sep 15.

Zhangdayu School of Chemistry, Dalian University of Technology, Dalian 116023, P. R. China.

Accurate and sensitive fluorescence imaging of intracellular miRNA is essential for understanding the mechanism underlying some physiological and pathological events, as well as the prevention and diagnosis of diseases. Herein, a highly sensitive ratiometric fluorescent nanoprobe for intracellular miRNA imaging was fabricated by integrating a [email protected] ([email protected]) nanoplatform with a near-infrared light (NIR)-assisted DNA strand displacement signal amplification strategy. The [email protected] spheres have excellent biosafety, high photothermal effect, and unique photophysical properties that can both emit a stable red fluorescence and well quench the fluorophores getting closer to them. Read More

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September 2021

Photocatalytic redox on the surface of colloidal silver nanoparticles revealed by second harmonic generation and two-photon luminescence.

Phys Chem Chem Phys 2021 Sep 15;23(35):19752-19759. Epub 2021 Sep 15.

Shenzhen Key Laboratory of Flexible Printed Electronics Technology, also School of Science, Harbin Institute of Technology (Shenzhen), University Town, Shenzhen 518055, Guangdong, China.

The redox of silver on the surface of Ag nanoparticles (AgNPs) has received extensive attention because of its significant impact on the biological, physical and chemical properties of AgNPs and their applications. Here we demonstrate that the surface redox reaction of AgNPs in colloids may be investigated by the second harmonic generation (SHG) and two-photon luminescence (TPL) emission from the AgNPs. It was revealed that the oxidation of silver on the surface of AgNPs was accelerated upon femtosecond laser excitation, accompanied by a decrease in the SHG and TPL emissions from the AgNPs. Read More

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September 2021

Induction of hemolysis and eryptosis by occupational pollutant nickel chloride is mediated through calcium influx and p38 MAP kinase signaling.

Int J Occup Med Environ Health 2021 Aug 30. Epub 2021 Aug 30.

King Saud University, Riyadh, Saudi Arabia (College of Applied Medical Sciences, Department of Clinical Laboratory Sciences).

Objectives: Nickel (Ni) is an abundant environmental hazard and an occupational pollutant. Exposure to Ni compounds is prevalent in electroplating workers and in the printing industry, among others. The toxicity of Ni manifests as dermatological, gastrointestinal, respiratory, allergic, and cardiovascular symptoms. Read More

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Functional Polysiloxane Enables Visualization of the Presence of Carbon Monoxide in Biological Systems and Films.

Anal Chem 2021 Sep 15. Epub 2021 Sep 15.

School of Chemistry and Chemical Engineering, School of Materials Science and Engineering, University of Jinan, Jinan, Shandong 250022, P.R. China.

As an essential gasotransmitter, carbon monoxide (CO) had gradually become a research hotspot in that it possessed important physiological functions and unique pharmacological properties. However, to date, no report has focused on the topic of detecting CO both in vivo and using films. To open up a new field of CO probes, for the first time, we designed a probe () that showed a distinctive ratio emission characteristic and displayed the quantitative distribution of CO in HeLa cells and zebrafish with a higher signal-to-noise ratio. Read More

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September 2021

Structural Transformation of Heterogeneous Materials for Electrocatalytic Oxygen Evolution Reaction.

Chem Rev 2021 Sep 15. Epub 2021 Sep 15.

Hefei National Laboratory for Physical Sciences at the Microscale, CAS Center for Excellence in Nanoscience, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) and CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China.

Electrochemical water splitting for hydrogen generation is a promising pathway for renewable energy conversion and storage. One of the most important issues for efficient water splitting is to develop cost-effective and highly efficient electrocatalysts to drive sluggish oxygen-evolution reaction (OER) at the anode side. Notably, structural transformation such as surface oxidation of metals or metal nonoxide compounds and surface amorphization of some metal oxides during OER have attracted growing attention in recent years. Read More

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September 2021

Cd-Free InP/ZnSeS Quantum Dots for Ultrahigh-Resolution Imaging of Stimulated Emission Depletion.

J Biophotonics 2021 Sep 15:e202100230. Epub 2021 Sep 15.

Center for Biomedical Optics and Photonics (CBOP) & College of Physics and Optoelectronic Engineering, Key Laboratory of Optoelectronic Devices and Systems, Shenzhen University, Shenzhen, P. R. China.

Stimulated emission depletion (STED) nanoscopy is a promising super-resolution imaging technique for microstructure imaging; however, the performance of super-resolution techniques critically depends on the properties of the fluorophores (photostable fluorophores) used. In this study, a suitable probe for improving the resolution of STED nanoscopy was investigated. Quantum dots (QDs) typically exhibit good photobleaching resistance characteristics. Read More

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September 2021

Detection of hydrogen peroxide and glucose with a novel fluorescent probe by the enzymatic reaction of amino functionalized MOF nanosheets.

Anal Methods 2021 Sep 3. Epub 2021 Sep 3.

Key Lab of Bioelectrochemistry & Environmental Analysis of Gansu, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China.

Amino-functionalized two-dimensional (2D) MOFs have great potential in biosensors due to their excellent water solubility, high fluorescence, large specific surface area, good adsorption properties and good ability to enrich the target analytes. Fluorescence detection of hydrogen peroxide and glucose mostly relies on monitoring the single fluorescence intensity changes in a single excitation wavelength. Here, a ratiometric fluorescence sensor based on NH-MIL-53(Al) nanosheets to sensitively detect HO and glucose through enzymatic reactions was developed. Read More

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September 2021

Fluorine-18 Labeling of the MDM2 Inhibitor RG7388 for PET Imaging: Chemistry and Preliminary Evaluation.

Mol Pharm 2021 Sep 15. Epub 2021 Sep 15.

Department of Radiology, Duke University Medical Center, Durham, North Carolina 27710, United States.

RG7388 (Idasanutlin) is a potent inhibitor of oncoprotein murine double minute 2 (MDM2). Herein we investigated the feasibility of developing F-labeled RG7388 as a radiotracer for imaging MDM2 expression in tumors with positron emission tomography (PET). Two fluorinated analogues of RG7388, and , were synthesized by attaching a fluoronicotinyl moiety to RG7388 via a polyethylene glycol (PEG) or a propyl linker. Read More

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September 2021

Electrochemiluminescence Immunoassay Platform with Immunoglobulin G-Encapsulated Gold Nanoclusters as a "Two-In-One" Probe.

Anal Chem 2021 Sep 15. Epub 2021 Sep 15.

Higher Educational Key Laboratory for Nano Biomedical Technology of Fujian Province, Department of Pharmaceutical Analysis, Faculty of Pharmacy, Fujian Medical University, Fuzhou 350004, China.

Biomolecule-functionalized Au nanoclusters (AuNCs) have drawn great interest in the electrochemiluminescence (ECL) field due to their unique optical/electrical properties, biocompatibility, and versatile bioapplication potentials. Herein, we proposed a two-in-one ECL probe of immunoglobulin G-encapsulated AuNCs (IgG-AuNCs) for the development of a high-performance ECL immunoassay (ECLIA) platform. The IgG-AuNCs were not only used as an ECL probe due to their excellent anodic ECL performance with triethylamine (TEA) as a coreactant but also used as the biorecognition element because of their well-retained bioactivity of the IgG. Read More

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September 2021

Ultrafast Charge-Transfer Dynamics in Twisted MoS/WSe Heterostructures.

ACS Nano 2021 Sep 14. Epub 2021 Sep 14.

Fachbereich Physik und Zentrum für Materialwissenschaften, Philipps-Universität, 35032 Marburg, Germany.

Two-dimensional transition metal dichalcogenides offer a fascinating platform for creating van der Waals heterojunctions with exciting physical properties. Because of their typical type-II band alignment, photoexcited electrons and holes can separate interfacial charge transfer. Furthermore, the relative crystallographic alignment of the individual layers in these heterostructures represents an important degree of freedom. Read More

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September 2021

The nonlinear optical transition bleaching in tellurene.

Nanoscale 2021 Sep 14. Epub 2021 Sep 14.

Hunan Key Laboratory of Nanophotonics and Devices, School of Physics and Electronics, Central South University, 932 South Lushan Road, Changsha, Hunan 410083, P. R. China.

To date, outstanding linear and nonlinear optical properties of tellurene, caused by multiple two-dimensional (2D) phases and optical anisotropy, have attracted considerable interest for potential nanophotonics applications. In this work, the ultrafast nonlinear optical (NLO) properties of α-tellurene have been studied -scan and pump-probe techniques at a broadband spectral region. Typical saturable absorption and band filling effects are observed in tellurene due to the Pauli exclusion principle. Read More

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September 2021

Curcumin Complex Analogues as Near-Infrared Fluorescent Probes for Monitoring all Aβ Species in the Early Alzheimer's Disease Model.

ACS Chem Neurosci 2021 Sep 14. Epub 2021 Sep 14.

Shanghai Engineering Research Center of Organ Repair, School of Medicine School of Medicine, Shanghai University, Shanghai 200444, PR China.

Aggregation of amyloid β-peptide (Aβ) is closely related to the pathology of Alzheimer's disease (AD). In this pathology, the beginning stage is characterized by excessive accumulation of Aβ monomers due to imbalanced Aβ in the process of clearance. The Aβ peptide exists in many forms such as soluble and insoluble Aβ species, both of which coexist during the progression of AD and contribute to AD pathology. Read More

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September 2021

Revealing Ionic Signal Enhancement with Probe Grafting Density on the Outer Surface of Nanochannels.

Anal Chem 2021 Sep 14. Epub 2021 Sep 14.

State Key Laboratory of Biogeology and Environmental Geology, Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, P. R. China.

Probe-modified nanopores/nanochannels are one of the most advanced sensors because the probes interact strongly with ions and targets in nanoconfinement and create a sensitive and selective ionic signal. Recently, ionic signals have been demonstrated to be sensitive to the probe-target interaction on the outer surface of nanopores/nanochannels, which can offer more open space for target recognition and signal conversion than nanoconfined cavities. To enhance the ionic signal, we investigated the effect of grafting density, a critical parameter of the sensing interface, of the probe on the outer surface of nanochannels on the change rate of the ionic signal before and after target recognition (β). Read More

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September 2021

Evaluation of the Drug-Drug Interaction Potential of Treosulfan using a Physiologically-Based Pharmacokinetic Modelling Approach.

Br J Clin Pharmacol 2021 Sep 13. Epub 2021 Sep 13.

medac Gesellschaft für klinische Spezialpräparate mbH, Wedel, Germany.

Aims: The aim of this work is the development of a mechanistic Physiologically Based Pharmacokinetic (PBPK) model using in vitro to in vivo extrapolation (IVIVE) to conduct a DDI (drug-drug interaction) assessment of treosulfan against two cytochrome p450 isoenzymes and P-gp substrates.

Methods: A PBPK model for treosulfan was developed de-novo based on literature and unpublished clinical data. The PBPK DDI analysis was conducted using the FDA DDI index drugs (probe substrates) midazolam, omeprazole, and digoxin for CYP3A4, CYP2C19, and P-gp, respectively. Read More

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September 2021