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431311

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Karunakara A Chandrashekara et al.
Journal of chromatographic science, 52(8), 799-805 (2013-07-31)
A simple and rapid reverse-phase high-performance liquid chromatographic (RP-HPLC) method was developed and validated for the simultaneous separation and estimation of gefitinib (an anti-cancer drug) and its process-related impurities. Five process-related impurities of gefitinib were separated on an Inertsil ODS-3V...
Monique Zangarini et al.
Journal of pharmaceutical and biomedical analysis, 95, 107-112 (2014-03-26)
A rapid, sensitive and specific HPLC-MS/MS method was developed and validated for the quantification of trabectedin in human plasma after using deuterated trabectedin as Internal Standard (IS). After the addition of ammonium sulphate, the analyte was extracted from human plasma...
Eszter Németh et al.
Protein science : a publication of the Protein Society, 23(8), 1113-1122 (2014-06-05)
The nuclease domain of colicin E7 (NColE7) promotes the nonspecific cleavage of nucleic acids at its C-terminal HNH motif. Interestingly, the deletion of four N-terminal residues (446-449 NColE7 = KRNK) resulted in complete loss of the enzyme activity. R447A mutation was reported...
Joan Eilstein et al.
Archives of toxicology, 88(9), 1681-1694 (2014-03-25)
Skin function is not limited to a physical barrier. According to its total surface area, it is also considered as an extra-hepatic metabolizing organ. In vitro engineered human skins have been developed to replace limited ex vivo normal human skin...
Matthew W Vetting et al.
Biochemistry, 54(3), 909-931 (2014-12-30)
The rate at which genome sequencing data is accruing demands enhanced methods for functional annotation and metabolism discovery. Solute binding proteins (SBPs) facilitate the transport of the first reactant in a metabolic pathway, thereby constraining the regions of chemical space...
Sarah K Poznanovic et al.
Mycorrhiza, 25(2), 153-164 (2014-08-06)
Coarse woody debris (CWD) is an important nursery environment for many tree species. Understanding the communities of ectomycorrhizal fungi (ECMF)and the effect of ECMF species on tree seedling condition in CWD will elucidate the potential for ECMF-mediated effects on seedling...
Ana R Ribeiro et al.
Journal of chromatography. A, 1418, 140-149 (2015-10-04)
The fate and removal of organic micropollutants in the environment is a demanding issue evidenced by the recent European policy. This work presents an analytical method for the trace quantification of 37 micropollutants including Priority Substances (Directive 2013/39/EU), substances of...
Arne Trettin et al.
Journal of chromatography. B, Analytical technologies in the biomedical and life sciences, 959, 71-81 (2014-04-29)
Paracetamol (acetaminophen) is a widely used safe analgesic drug when administered at therapeutic doses. Given the chemical reactivity of its phenolic group towards electrophilic species, we assumed that detection of paracetamol metabolites distinctly different from its known phase I metabolite...
Jessica Z Bereszczak et al.
Protein science : a publication of the Protein Society, 23(7), 884-896 (2014-04-10)
Hepatitis B virus core-antigen (capsid protein) and e-antigen (an immune regulator) have almost complete sequence identity, yet the dimeric proteins (termed Cp149d and Cp(-10)149d , respectively) adopt quite distinct quaternary structures. Here we use hydrogen deuterium exchange-mass spectrometry (HDX-MS) to...
Ian S Westley et al.
Therapeutic drug monitoring, 37(6), 821-826 (2015-03-17)
The polymorphic nature of cytochrome P450 2D6 has made therapeutic drug monitoring of the anti-anginal agent perhexiline a compulsory step in reducing adverse events associated with plasma concentrations above the therapeutic range (0.15-0.60 mg/L). The aim of this study was...
Fei Xu et al.
FEMS microbiology letters, 358(1), 98-105 (2014-07-24)
This study investigated inactivation of bacteria with ultraviolet light A irradiation in combination with vitamin K3 as a photosensitizer. Six bacteria including Bacillus cereus, Pseudomonas aeruginosa, Staphylococcus aureus, Staphylococcus epidermidis, Klebsiella pneumoniae, and Escherichia coli suspended in vitamin K3 aqueous...
Ana Freitas et al.
Journal of the science of food and agriculture, 95(1), 44-52 (2014-05-24)
The industrial processing of pineapple generates a high quantity of by-products. To reduce the environmental impact of these by-products and the inherent cost of their treatment, it is important to characterise and valorise these products, converting them into high added...
Francesco De Pascali et al.
Biochemistry, 53(22), 3679-3688 (2014-04-25)
Ischemia-reperfusion injury is accompanied by endothelial hypoxia and reoxygenation that trigger oxidative stress with enhanced superoxide generation and diminished nitric oxide (NO) production leading to endothelial dysfunction. Oxidative depletion of the endothelial NO synthase (eNOS) cofactor tetrahydrobiopterin can trigger eNOS...
Harald Unterweger et al.
International journal of nanomedicine, 10, 6985-6996 (2015-12-10)
Combining the concept of magnetic drug targeting and photodynamic therapy is a promising approach for the treatment of cancer. A high selectivity as well as significant fewer side effects can be achieved by this method, since the therapeutic treatment only...
Claudia Dietze et al.
Analytical and bioanalytical chemistry, 407(29), 8735-8743 (2015-09-24)
A fast and straightforward method to prototype microfluidic chip systems for dead-volume-free hyphenation to electrospray-ionisation mass spectrometry is presented. The developed approach based on liquid-phase lithography provides an inexpensive and reliable access to microfluidic chips for MS coupling which can...
Nancy D Epsky et al.
Journal of economic entomology, 105(2), 471-479 (2012-05-23)
Tests were conducted that evaluated efficacy of wax matrix bait stations for Ceratitis capitata (Wiedemann) adults in Guatemala. Bait stations were exposed to outdoor conditions to determine effect of weathering on longevity as indicated by bait station age. Results of...
Ewa Sitkiewicz et al.
PloS one, 9(6), e100200-e100200 (2014-06-20)
Oligomeric forms of Aβ peptide are most likely the main synaptotoxic and neurotoxic agent in Alzheimer's disease. Toxicity of various Aβ oligomeric forms has been confirmed in vivo and also in vitro. However, in vitro preparations were found to be...
Yan Gao et al.
Environmental pollution (Barking, Essex : 1987), 194, 60-68 (2014-08-06)
In this study, 166 surface sediments and 3 sediment cores from the Bohai Sea (BS), Yellow Sea (YS) and East China Sea (ECS) in China were collected to investigate the spatial and temporal distributions and the transport of PFASs. PFASs...
Jadwiga Lyczko et al.
Journal of mass spectrometry : JMS, 50(3), 463-469 (2015-03-25)
Common calibration standards for mass spectrometry can be a source of many problems including instrument contamination, ionization suppression and formation of unidentified ions during subsequent analysis. In this article, we present a new approach for the calibration of mass analyzers...
Xianzhi Peng et al.
Journal of chromatography. A, 1384, 97-106 (2015-02-01)
A sensitive and reliable method was developed for multi-target determination of 13 most widely used organic ultraviolet (UV) absorbents (including UV filters and UV stabilizers) in aquatic organism tissues. The organic UV absorbents were extracted using ultrasonic-assisted extraction, purified via...
Jace W Jones et al.
Health physics, 106(1), 106-119 (2013-11-28)
Biomarker identification and validation for radiation exposure is a rapidly expanding field encompassing the need for well defined animal models and advanced analytical techniques. The resources within the consortium, Medical Countermeasures Against Radiological Threats (MCART), provide a unique opportunity for...
Caifen Wang et al.
Journal of chromatography. A, 1359, 287-295 (2014-07-30)
The kinetics of the dissociation is fundamental to the formation and the in vivo performance of cyclodextrin supramolecules. The individual determination of the apparent dissociation rate constant (kd,app) using high performance affinity chromatography (HPAC) is a tedious process requiring numerous...
Ugo Bussy et al.
Environmental science & technology, 49(7), 4450-4457 (2015-03-03)
This is the first study to use electrochemistry to generate a nitro reduction metabolite as a standard for a liquid chromatography-mass spectrometry-based quantitative assay. This approach is further used to quantify 3-trifluoromethyl-4-nitrophenol (TFM) reductive metabolism. TFM is a widely used...
Emmanuelle Vulliet et al.
Environmental science and pollution research international, 21(12), 7512-7521 (2014-03-07)
To collect a complete dataset regarding the occurrence of organic substances in groundwater, this study presents the examination of 66 organic contaminants in the groundwater of overseas departments, including pesticides, pharmaceutical compounds, hormones and some industrial substances. The selective and...
Min Shen et al.
Journal of chromatography. B, Analytical technologies in the biomedical and life sciences, 967, 84-89 (2014-08-03)
6-Monoacetylmorphine in keratinized matrices can be used to discriminate between heroin users and individuals exposed to other sources of morphine alkaloids. Frozen pulverization is effective in preventing 6-monoacetylmorphine hydrolysis. The main aim of this study was to develop an LC-MS/MS...
Apinya Wisutiamonkul et al.
Food chemistry, 180, 301-305 (2015-03-15)
Durian (Durio zibethinus) cvs. Chanee and Monthong fruit were severed from the tree during 14 day intervals, from 10 weeks after anthesis until commercial maturity. We determined the pulp (i.e. aril; fruit flesh) carotenoid composition, together with pulp firmness, color...
Ana Rita Ribeiro et al.
Journal of chromatography. A, 1363, 226-235 (2014-07-23)
The interest for environmental fate assessment of chiral pharmaceuticals is increasing and enantioselective analytical methods are mandatory. This study presents an enantioselective analytical method for the quantification of seven pairs of enantiomers of pharmaceuticals and a pair of a metabolite....
Meng-Yang Chang et al.
Organic letters, 14(15), 3936-3939 (2012-07-24)
A facile two-step synthetic route for preparing the novel tetracyclic skeleton of benzofused 2,6-diaryl-1-azahomoisotwistanes 2 had been developed. The route was carried out by a one-pot tandem cross-coupling reaction of o-allylbenzaldehydes 1 with aryl methyl ketones 3, and NH(4)OAc mediated...
Estela Giménez et al.
Analytica chimica acta, 866, 59-68 (2015-03-04)
In this work we demonstrate the potential of glycan reductive isotope labeling (GRIL) using [(12)C]- and [(13)C]-coded aniline and zwitterionic hydrophilic interaction capillary liquid chromatography electrospray mass spectrometry (μZIC-HILIC-ESI-MS) for relative quantitation of glycosylation variants in selected glycoproteins present in...
Siwei Li et al.
Journal of mass spectrometry : JMS, 49(11), 1191-1198 (2014-11-15)
Recently, we developed a method for modified ribonucleic acid (RNA) analysis based on the comparative analysis of RNA digests (CARD). Within this CARD approach, sequence or modification differences between two samples are identified through differential isotopic labeling of two samples....
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