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https://www.readbyqxmd.com/read/29778008/plasma-metabolic-changes-in-chinese-hiv-infected-patients-receiving-lopinavir-ritonavir-based-treatment-implications-for-hiv-precision-therapy
#1
Xiaolin Li, Tong Wu, Yongjun Jiang, Zining Zhang, Xiaoxu Han, Wenqing Geng, Haibo Ding, Jing Kang, Qi Wang, Hong Shang
OBJECTIVES: The goal of this study is to profile the metabolic changes in the plasma of HIV patients receiving lopinavir/ritonavir (LPV/r)-based highly active antiretroviral therapy (HAART) relative to their treatment-naïve phase, aimed to identify precision therapy for HIV for improving prognosis and predicting dyslipidemia caused by LPV/r. METHODS: 38 longitudinal plasma samples were collected from 19 HIV-infected patients both before and after antiretroviral therapy, and 18 samples from healthy individuals were used as controls...
May 16, 2018: Cytokine
https://www.readbyqxmd.com/read/29777984/lc-ms-analysis-to-determine-the-biodistribution-of-a-polymer-coated-ilomastat-ocular-implant
#2
Abeer H A Mohamed-Ahmed, Alastair Lockwood, Hala Fadda, Shivam Madaan, Peng T Khaw, Steve Brocchini, Kersti Karu
Ilomastat is a matrix metalloproteinase inhibitor (MMPi) that has shown the potential to inhibit scarring (fibrosis) by mediating healing after injury or surgery. A long lasting ocular implantable pharmaceutical formulation of ilomastat is being developed to mediate the healing process to prevent scarring after glaucoma filtration surgery. The ilomastat implant was coated with water permeable and biocompatible phosphoryl choline polymer (PC1059) displayed extended slow release of ilomastat in vitro and in vivo...
May 16, 2018: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29777902/chemical-characterization-and-cerebroprotective-effect-of-methanolic-root-extract-of-colebrookea-oppositifolia-in-rats
#3
Gollapalle Lakshminarayanashastry Viswanatha, Marikunte V Venkataranganna, Nunna Bheema Lingeswara Prasad, Shylaja Hanumanthappa
ETHNOPHARMACOLOGICAL RELEVANCE: Colebrookea oppositifolia Smith is one of the extensively used plants to treat neurological conditions such as epilepsy by the various ethnic communities in sub-Himalayan regions of India such as Bhoxa, Tharu and nomadic Gujjars. AIM OF THE STUDY: This study was conducted to evaluate the cerebroprotective effect of C. oppositifolia methanolic root (MeCO) extract in Wistar rats. MATERIALS AND METHODS: The MeCO was characterized for total phenolic content and later subjected for detailed liquid chromatography-mass spectrometry analysis...
May 16, 2018: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/29777634/characterisation-of-the-outer-membrane-proteome-of-francisella-noatunensis-subsp-orientalis
#4
Khalid Shahin, Kim D Thompson, Neil F Inglis, Kevin Mclean, Jose Gustavo Ramirez-Paredes, Sean J Monaghan, Rowena Hoare, Michael Fontaine, Matthijs Metselaar, Alexandra Adams
AIMS: The aims of the current study were to characterise the outer membrane proteins (OMPs) of Francisella noatunensis subsp. orientalis (Fno) STIR-GUS-F2f7, and identify proteins recognised by sera from tilapia, Oreochromis niloticus, (L) that survived experimental challenge with Fno. METHODS AND RESULTS: The composition of the OMPs of a virulent strain of Fno (STIR-GUS- F2f7), isolated from diseased red Nile tilapia in UK, was examined. The sarcosine-insoluble OMP fraction was screened with tilapia hyper-immune sera by western blot analysis following separation of the proteins by 1D SDS-PAGE...
May 19, 2018: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/29777607/optimizing-charge-state-distribution-is-a-prerequisite-for-accurate-protein-biomarker-quantification-with-lc-ms-ms-as-illustrated-by-hepcidin-measurement
#5
Ellen M H Schmitz, Niels M Leijten, Joost L J van Dongen, Maarten A C Broeren, Lech G Milroy, Luc Brunsveld, Volkher Scharnhorst, Daan van de Kerkhof
BACKGROUND: Targeted quantification of protein biomarkers with liquid chromatography-tandem mass spectrometry (LC-MS/MS) has great potential, but is still in its infancy. Therefore, we elucidated the influence of charge state distribution and matrix effects on accurate quantification, illustrated by the peptide hormone hepcidin. METHODS: An LC-MS/MS assay for hepcidin, developed based on existing literature, was improved by using 5 mM ammonium formate buffer as mobile phase A and as an elution solution for solid phase extraction (SPE) to optimize the charge state distribution...
May 19, 2018: Clinical Chemistry and Laboratory Medicine: CCLM
https://www.readbyqxmd.com/read/29777494/residue-behavior-and-risk-assessment-of-thifluzamide-in-the-maize-field-ecosystem
#6
Cong Ma, Zhongdong Liu, Yan Qi, Shanshan Wang, Xiaolin Cao, Jing Wang, Yongxin She, Yong Shao, Jitai Shen, Chao Zhang, Zejun Jiang
In the present work, the dissipation kinetics and final residue levels of thifluzamide in the maize field ecosystem were investigated. Using a modified quick, easy, cheap, effective, rugged, and safe (QuEChERS) extraction combined with liquid chromatography-tandem mass spectrometric detection (LC-MS/MS), a rapid, sensitive, efficient, and reliable method for extraction and quantitative analysis of thifluzamide residues in maize grain, maize plant, and soil was developed. Satisfactory recoveries of 78.7-97.0% were achieved with relative standard deviations (RSDs) in the range of 1...
May 18, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29776996/effects-of-chronic-exposure-to-12%C3%A2-saltwater-on-the-endocrine-physiology-of-juvenile-american-alligator-alligator-mississippiensis
#7
P C Faulkner, M L Burleson, L Simonitis, C Marshall, D Hala, L H Petersen
American alligator ( Alligator mississippiensis , Linnaeus) habitats are prone to saltwater intrusion following major storms, hurricanes or droughts. Anthropogenic impacts affecting hydrology of freshwater systems may exacerbate saltwater intrusion into freshwater habitats. The endocrine system of alligators is susceptible to changes in the environment but it is currently not known how the crocodilian physiological system responds to environmental stressors such as salinity. Juvenile alligators were exposed to 12‰ saltwater for 5 weeks to determine effects of chronic exposure to saline environments...
May 18, 2018: Journal of Experimental Biology
https://www.readbyqxmd.com/read/29776454/determination-of-three-chromium-textile-azo-dyes-in-wastewater-by-spe-lc-esi-ms-ms
#8
Florina-Maria Copaciu, Dorina Simedru, Maria-Virginia Coman
In the present work, a procedure to determine three textile azo dyes, chromium-complexes [Nylosan Dark Brown (NDB), Lanasyn Dark Brown (LDB), and Lanasyn Red (LR)], from wastewater using solid-phase extraction (SPE) followed by LC-electrospray ionization negative mode tandem mass spectrometry (LC-ESI(-)-MS/MS) has been developed. The extraction/concentration and recovery degree of these dyes from liquid matrices were done on Strata WAX/NH₂ cartridges. The chromatographic separation was performed using a Luna C18 (2) 100Å column by isocratic elution with a methanol-acetonitrile-water (0...
May 18, 2018: Journal of AOAC International
https://www.readbyqxmd.com/read/29776453/dye-residue-analysis-in-raw-and-processed-aquaculture-products-matrix-extension-of-aoac-international-official-method-%C3%A2-2012-25
#9
Wendy C Andersen, Christine R Casey, Tara J Nickel, Susan L Young, Sherri B Turnipseed
Background : Triphenylmethane dyes and metabolites are known or suspected mutagens and areprohibited in animals intended for human consumption. Despite toxicity, triphenylmethane dyes are used illegally as inexpensive treatments for fungal and parasite infections in aquatic animals. Objective: AOAC INTERNTIONAL Official Method ℠ 2012.25 for the LC-MS/MS determination of malachite green, crystal violet, brilliant green, and metabolites leucomalachite green and leucocrystal violet in seafood products was previously validated for finfish (trout, salmon, catfish, and tilapia) and shrimp, but had not been fully validated for other types of aquacultured products such as eel, molluscan shellfish, or frog or for processed seafoods...
May 18, 2018: Journal of AOAC International
https://www.readbyqxmd.com/read/29775923/determination-of-hydroxy-metabolites-of-cocaine-from-hair-samples-and-comparison-with-street-cocaine-samples
#10
Thomas Franz, Frank Scheufler, Klaus Stein, Michael Uhl, Torsten Dame, Gerlinde Schwarz, Hans Sachs, Gisela Skopp, Frank Musshoff
Drugs which are commonly smoked or sniffed (e.g. cocaine), can contaminate hair through smoke or dust; therefore testing for metabolites, especially hydroxy metabolites, is highly recommended. The presence of hydroxy metabolites in street-cocaine (COC) has been discussed. To check if detection of hydroxy metabolites definitely proves ingestion, the presence of these metabolites in street COC samples has to be checked. It is expected that the more hydrophilic hydroxy metabolites of COC are incorporated into the hair-matrix to a lesser extent...
April 12, 2018: Forensic Science International
https://www.readbyqxmd.com/read/29775840/development-of-a-lc-ms-method-for-simultaneous-determination-of-amoxicillin-and-metronidazole-in-human-serum-using-hydrophilic-interaction-chromatography-hilic
#11
Udani L Kathriarachchi, Sagar S Vidhate, Naser Al-Tannak, Alison H Thomson, Michael J J da Silva Neto, David G Watson
A method was developed for the determination of amoxicillin and metronidazole in human serum. The procedure used was hydrophilic interaction chromatography (HILIC) followed by mass spectrometric (MS) detection. Chromatographic separation was achieved on a ZIC-HILIC column and the mobile phase consisted of a mixture of 0.1% (v/v) formic acid in water and 0.1% (v/v) formic acid in acetonitrile. The method was validated with regard to selectivity, accuracy, precision, calibration, lower limit of quantification (LOQ), extraction recovery and matrix effect...
May 15, 2018: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29775811/determination-of-docetaxel-in-dried-blood-spots-by-lc-ms-ms-method-development-validation-and-clinical-application
#12
S Raymundo, V V Muller, N B Andriguetti, M Tegner, A C Artmann, H M Kluck, M A Franzoi, R M M Vilela, G Schwartsmann, R Linden, M V Antunes
In this study, a LC-MS/MS method for the measurement of docetaxel in Dried Blood Spots (DBS) samples was developed and validated. Docetaxel was extracted from 8 mm DBS punch with a mixture of methanol and acetonitrile (9:1, v/v). The chromatographic separation occurred in an Acquity® C18 column (150 × 2.1 mm, 1.7 μm) eluted with a mixture of water and acetonitrile plus 0.1% formic acid (45:55, v/v). Total analytical run time was 7 min. The method was linear from 50 to 3000 ng ml-1 . Precision assays showed CV% < 9...
May 15, 2018: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29775427/determination-of-fipronil-and-its-metabolites-in-chicken-egg-muscle-and-cake-by-a-modified-quechers-method-coupled-with-lc-ms-ms
#13
Qiaozhen Guo, Shan Zhao, Jing Zhang, Kailun Qi, Zhenxia Du, Bing Shao
An easy-to-use method for determining the levels of fipronil and its metabolites (fipronil-desulfinyl, fipronil-sulfone and fipronil-sulfide) in chicken egg, muscle and cake was developed and validated using a modified quick, easy, cheap, effective, rugged, and safe (QuEChERS) approach coupled with liquid chromatography-tandem mass spectrometry (LC-MS/MS) analysis. The samples were extracted using acetonitrile, salted out with sodium chloride at -20 °C, and then purified by combined PSA and C18 phases and anhydrous magnesium sulfate...
May 18, 2018: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/29775069/simultaneous-release-and-labelling-of-o-and-n-glycans-allowing-for-rapid-glycomic-analysis-by-online-lc-uv-esi-ms-ms
#14
Chengjian Wang, Yu Lu, Jianli Han, Wanjun Jin, Lingmei Li, Ying Zhang, Xuezheng Song, Linjuan Huang, Zhongfu Wang
Most glycoproteins and biological protein samples undergo both O- and N-glycosylation, making characterization of their structures very complicated and time-consuming. Nevertheless, to fully understand the biological functions of glycosylation, both the glycosylation forms need to be analyzed. Herein we report a versatile, convenient one-pot method in which O- and N-glycans are simultaneously released from glycoproteins and chromogenically labelled in situ and thus available for further characterization. In this procedure, glycoproteins are incubated with 1-phenyl-3-methyl-5-pyrazolone (PMP) in aqueous ammonium hydroxide, making O-glycans released from protein backbones by beta-elimination and N-glycans liberated by alkaline hydrolysis...
May 18, 2018: Journal of Proteome Research
https://www.readbyqxmd.com/read/29773836/novel-pathway-of-3-hydroxyanthranilic-acid-formation-in-limazepine-biosynthesis-reveals-evolutionary-relation-between-phenazines-and-pyrrolobenzodiazepines
#15
Magdalena Pavlikova, Zdenek Kamenik, Jiri Janata, Stanislav Kadlcik, Marek Kuzma, Lucie Najmanova
Natural pyrrolobenzodiazepines (PBDs) form a large and structurally diverse group of antitumour microbial metabolites produced through complex pathways, which are encoded within biosynthetic gene clusters. We sequenced the gene cluster of limazepines and proposed their biosynthetic pathway based on comparison with five available gene clusters for the biosynthesis of other PBDs. Furthermore, we tested two recombinant proteins from limazepine biosynthesis, Lim5 and Lim6, with the expected substrates in vitro...
May 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29773674/deep-sequencing-of-complex-proteoglycans-a-novel-strategy-for-high-coverage-and-site-specific-identification-of-glycosaminoglycan-linked-peptides
#16
Joshua A Klein, Le Meng, Joseph Zaia
Proteoglycans are distributed in all animal tissues and play critical, multifaceted, physiological roles.  Expressed in a spatially- and temporally-regulated manner, these molecules regulate interactions among growth factors and cell surface receptors and play key roles in basement membranes and other extracellular matrices.  Due to the high degree of glycosylation by glycosaminoglycan (GAG), N-glycan and mucin-type O-glycan classes, the peptide sequence coverage of complex proteoglycans is revealed poorly by standard mass spectrometry-based proteomics methods...
May 17, 2018: Molecular & Cellular Proteomics: MCP
https://www.readbyqxmd.com/read/29773468/determination-of-vitamin-b-12-in-equine-urine-by-liquid-chromatography-inductively-coupled-plasma-mass-spectrometry
#17
Ross Wenzel, Derek Major, Karly Hesp, Philip Doble
Regulating authorities in the racing industry have restricted the administration of potentially performance enhancing cobalt salts to horses. There are severe penalties for trainers presenting horses with elevated urine cobalt concentrations, and compliance is ensured via analysis of total urinary cobalt at thresholds of 100 μg/L. When cobalt is present as part of the cobalamin molecule it is not considered performance enhancing. This paper demonstrates that a horse can excrete a significant proportion of a commercially available vitamin B12 injection in urine without metabolic modification...
May 9, 2018: Journal of Trace Elements in Medicine and Biology
https://www.readbyqxmd.com/read/29773341/a-full-solution-for-multi-component-quantification-oriented-quality-assessment-of-herbal-medicines-chinese-agarwood-as-a-case
#18
Huixia Huo, Yao Liu, Wenjing Liu, Jing Sun, Qian Zhang, Yunfang Zhao, Jiao Zheng, Pengfei Tu, Yuelin Song, Jun Li
The quality of herbal medicines (HMs) is the prerequisite for their pronounced therapeutic outcomes in clinic, and multi-component (also known as quality markers, Q-markers) quantification has been widely emphasized as a viable means for quality evaluation. Because of the chemical diversity, the quality control practices are extensively dampened by four principal technical bottlenecks, including the lack of authentic compounds, large polarity span, extensive concentration range, and signal misrecognition for those potential Q-markers...
May 9, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29773339/quantitation-of-isoprenoids-for-natural-rubber-biosynthesis-in-natural-rubber-latex-by-liquid-chromatography-with-tandem-mass-spectrometry
#19
Xi Zhang, Tianyang Guo, Tong Xiang, Yiyang Dong, Jichuan Zhang, Liqun Zhang
The natural rubber molecule is one of the end products of isoprenoids metabolism in the plant. Dimethylallyl diphosphate (DMAPP) and farnesyl pyrophosphate (FPP) are two typical isoprenoids which control the rate of biosynthesis and the molecular weight of natural rubber. A rapid, nonradioactive method for quantitation of DMAPP and FPP in natural rubber latex by liquid chromatography tandem with mass spectrometry (LC-MS/MS) was reported. DMAPP and FPP were determined in the multiple reaction monitoring mode(MRM)followed by separation with a silica-based C18 column...
May 3, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29772427/the-dif2ferent-behaviors-of-glyphosate-and-ampa-in-compost-amended-soil
#20
Tomas Erban, Martin Stehlik, Bruno Sopko, Martin Markovic, Marcela Seifrtova, Tatana Halesova, Pavel Kovaricek
The broad-spectrum herbicide glyphosate is one of the most widely used pesticides. Both glyphosate and its major metabolite, aminomethylphosphonic acid (AMPA), persist in waters; thus, their environmental fates are of interest. We investigated the influence of compost dose, sampling depth, moisture and saturated hydraulic conductivity (Ks ) on the persistence of these substances. The amounts of AMPA quantified by triple quadrupole liquid chromatography-mass spectrometry (LC-QqQ-MS/MS) using isotopically labeled extraction standards were higher than those of glyphosate and differed among the samples...
May 4, 2018: Chemosphere
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