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Bioanalysis

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https://www.readbyqxmd.com/read/28207286/lc-ms-ms-simultaneous-analysis-of-allopregnanolone-epiallopregnanolone-pregnanolone-dehydroepiandrosterone-and-dehydroepiandrosterone-3-sulfate-in-human-plasma
#1
Luana Lionetto, Fernando De Andrés, Matilde Capi, Martina Curto, Donata Sabato, Maurizio Simmaco, Paola Bossù, Eleonora Sacchinelli, Maria Donata Orfei, Federica Piras, Nerisa Banaj, Gianfranco Spalletta
AIM: Several neuropsychopharmacological properties have been attributed to the 3α-reduced pregnane steroids, allopregnanolone and pregnanolone, as well as to dehydroepiandrosterone sulfate because of their ability to modulate γ-aminobutyric acid (GABAA) receptors in the CNS. In order to understand better their role in several mechanisms in CNS, a new methodology is proposed to monitor these compounds in human plasma. Methodology & results: The analytes were first derivatized with 2-hydrazinopyridine and extracted from plasma using SPE...
February 16, 2017: Bioanalysis
https://www.readbyqxmd.com/read/28207284/characterization-and-qc-of-biopharmaceuticals-by-ms-based-multi-attribute-method-advantages-and-challenges
#2
Yun Zhang, Jingzhong Guo
No abstract text is available yet for this article.
February 16, 2017: Bioanalysis
https://www.readbyqxmd.com/read/28176545/rapid-quantification-of-free-and-glucuronidated-thccooh-in-urine-using-coated-well-plates-and-lc-ms-ms-analysis
#3
Marianne Hädener, Wolfgang Weinmann, Dave R van Staveren, Stefan König
AIM: Generally, urine drug testing for cannabis abuse involves measuring total concentrations of 11-nor-9-carboxy-Δ(9)-tetrahydrocannabinol (THCCOOH) obtained by enzymatic and/or alkaline hydrolysis of THCCOOH-glucuronide. As hydrolysis can be inconsistent and incomplete, direct measurement of the two metabolites is preferable. Methodology & results: We developed a high-throughput LC-MS/MS method for simultaneous quantification of free and glucuronidated THCCOOH in urine using coated 96-well plates for analyte extraction and column-switching chromatography...
February 8, 2017: Bioanalysis
https://www.readbyqxmd.com/read/28176533/simultaneous-assay-of-multiple-antibiotics-in-human-plasma-by-lc-ms-ms-importance-of-optimizing-formic-acid-concentration
#4
Feng Chen, Zhe-Yi Hu, S Casey Laizure, Joanna Q Hudson
AIM: Optimal dosing of antibiotics in critically ill patients is complicated by the development of resistant organisms requiring treatment with multiple antibiotics and alterations in systemic exposure due to diseases and extracorporeal drug removal. Developing guidelines for optimal antibiotic dosing is an important therapeutic goal requiring robust analytical methods to simultaneously measure multiple antibiotics. METHODS: An LC-MS/MS assay using protein precipitation for cleanup followed by a 6-min gradient separation was developed to simultaneously determine five antibiotics in human plasma...
February 8, 2017: Bioanalysis
https://www.readbyqxmd.com/read/28176532/interview-with-jana-zemenov%C3%A3
#5
Jana Zemenova
Jana Zemenová talks to Sankeetha Nadarajah, Commissioning Editor: Jana is a PhD student of analytical chemistry in her final year at the University of Chemistry and Technology, Prague. She also works at the Institute of Organic Chemistry and Biochemistry of Czech Academy of Sciences, in the group led by Lenka Maletínská. She has obtained her MSc in Analysis of Drugs and continues working at UCT Prague under the supervision of David Sýkora.
February 8, 2017: Bioanalysis
https://www.readbyqxmd.com/read/28176531/37th-british-mass-spectrometry-society-annual-meeting
#6
Patricia Wright, Christine Eckers
The 37th British Mass Spectrometry Society (BMSS) annual meeting took place over a brilliantly sunny 3 days by the sea in the historic Eastbourne Winter Gardens on the south coast of England. It was held between 13 and 15 September 2016. Two-hundred attendees enjoyed a conference covering all aspects of MS with speakers drawn from across Europe and North America. The BMSS is particularly proud of the encouragement it offers students and early career scientists, both financially in the form of travel grants and also in terms of opportunities to present at an international level in a supportive atmosphere...
February 8, 2017: Bioanalysis
https://www.readbyqxmd.com/read/28176528/lc-ms-ms-determination-of-alectinib-and-its-major-human-metabolite-m4-in-human-urine-prevention-of-nonspecific-binding
#7
Katja Heinig, Denis Herzog, Luca Ferrari, Daniela Fraier, Kazuhiro Miya, Peter N Morcos
AIM: Alectinib (Alecensa(®)) is an anaplastic lymphoma kinase inhibitor for the treatment of anaplastic lymphoma kinase positive non-small-cell lung cancer, and M4 is its major pharmacologically active metabolite. To characterize the pharmacokinetics and excretion of alectinib and M4 in human urine, a bioanalytical method was required. RESULTS: An LC-MS/MS method using supported liquid extraction was developed for the determination of alectinib and M4 in human urine over the concentration range 0...
February 8, 2017: Bioanalysis
https://www.readbyqxmd.com/read/28134563/zenit-ra-evaluation-a-solid-phase-chemiluminescence-immunoassay-for-detection-of-anti-cellular-antibodies
#8
Enrique Melguizo Madrid, Concepción González-Rodríguez, María de Gracia Ávila-García, Teresa Arrobas-Velilla, Patricia Fernández-Riejos
AIM: The objective was to compare Zenit RA chemiluminescent immunoassay (CLIA) from Menarini Diagnostics and ELISA from INOVA Diagnostics for the presence of specific anti-Ro/SS-A, anti-La/SS-B, anti-U1snRNP, anti-Sm, anti-Scl-70, anti-Jo-1 antibodies. Results/methodology: We studied 501 samples (178 connective autoimmune disease, 150 other autoimmune or inflammatory disease and 173 other disease or healthy). All samples were analyzed using CLIA and ELISA. The Kappa agreement was excellent for anti-SSA/Ro (0...
January 30, 2017: Bioanalysis
https://www.readbyqxmd.com/read/28106476/quantification-of-hepcidin-25-in-human-cerebrospinal-fluid-using-lc-ms-ms
#9
Constance Delaby, Pauline Bros, Jérôme Vialaret, Amandine Moulinier, Vincent Delatour, Audrey Gabelle, Sylvain Lehmann, Christophe Hirtz
AIM: Hepcidin, the main iron metabolism regulator, can be detected in various biological fluids. Here, we describe a quantitative method of LC-MS/MS to quantify the 25 amino acid isoform of hepcidin (hepcidin-25) in human cerebrospinal fluid (CSF). Results & methodology: Samples were prepared through protein precipitation followed by solid phase extraction (SPE) and injected into a triple-quadrupole mass spectrometer. Validation of our method included determination of LOQ (0.1 ng/ml), repeatability, intermediate precision, recovery and linearity (up to 25 ng/ml)...
January 20, 2017: Bioanalysis
https://www.readbyqxmd.com/read/28103697/3-4-hydroxyphenyl-propionic-acid-the-forgotten-detection-substrate-for-ligand-binding-assay-based-bioanalysis
#10
Gregor Jordan, Kay-Gunnar Stubenrauch, Julia Heinrich, Roland F Staack
Ligand-binding assays are ideal for routine bioanalysis, but we reason that the straightforward replacement of the conventional chromogenic horseradish peroxidase substrate, 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid, of a routinely used preclinical immunoassay to detect hIgG, with the fluorogenic 3-(4-hydroxyphenyl)propionic acid would broaden the narrow dynamic range. The replacement leads to a sensitivity of 0.47 (minimum required dilution [MRD] 10) and 1.02 (MRD 50) ng/ml, and dynamic ranges of 3...
January 20, 2017: Bioanalysis
https://www.readbyqxmd.com/read/28102710/development-and-validation-of-a-uplc-ms-ms-method-for-simultaneous-determination-of-fotagliptin-and-its-two-major-metabolites-in-human-plasma-and-urine
#11
Zhenlei Wang, Ji Jiang, Pei Hu, Qian Zhao
AIM: Fotagliptin is a novel dipeptidyl peptidase IV inhibitor under clinical development for the treatment of Type II diabetes mellitus. The objective of this study was to develop and validate a specific and sensitive ultra-performance liquid chromatography (UPLC)-MS/MS method for simultaneous determination of fotagliptin and its two major metabolites in human plasma and urine. Methodology & results: After being pretreated using an automatized procedure, the plasma and urine samples were separated and detected using a UPLC-ESI-MS/MS method, which was validated following the international guidelines...
January 19, 2017: Bioanalysis
https://www.readbyqxmd.com/read/28102703/glyoxal-and-methylglyoxal-determination-in-urine-by-surfactant-assisted-dispersive-liquid-liquid-microextraction-and-lc
#12
Natalia Campillo, Pilar Viñas, Javier Marín, Manuel Hernández-Córdoba
AIM: Two important markers of oxidative stress, glyoxal and methylglyoxal, are preconcentrated from human urine by surfactant-assisted dispersive liquid-liquid microextraction and separated by LC-fluorescence. METHODS/RESULTS: Derivatization was carried out overnight with 0.8 mM 2,3-diaminonaphthalene at 4°C. For surfactant-assisted dispersive liquid-liquid microextraction, 500 µl buffer solution (pH 10.5) and 25 µl 0.03 M Triton X-114 were added to 2.5 ml of the sample and the mixture was made up to 10 ml before the rapid injection of 75 µl 1-undecanol (extractant solvent) and 0...
January 19, 2017: Bioanalysis
https://www.readbyqxmd.com/read/28102698/an-overview-of-the-china-bioanalytical-forum-interview-with-daniel-tang
#13
Daniel Tang
Daniel Tang talks to Sankeetha Nadarajah, Commissioning Editor-(Bioanalysis), regarding the China Bioanalysis Forum (CBF), in which Daniel was one of the co-founders and remains as its co-chair. Daniel is currently the CEO of UP Pharma, a biologics focused bioanalytical CRO in China.
January 19, 2017: Bioanalysis
https://www.readbyqxmd.com/read/28102694/evaluation-of-sample-extraction-methods-for-minimizing-hematocrit-effect-on-whole-blood-analysis-with-volumetric-absorptive-microsampling
#14
Zhengqi Ye, Hong Gao
AIM: Volumetric absorptive microsampler (VAMS) was designed to sample a fixed volume of blood regardless of the hematocrit (HCT) levels. Model compounds with a wide range of hydrophobicity were evaluated for their extraction recoveries from VAMS dried blood samples. RESULTS: For the highly hydrophobic compounds, recoveries with methanol or methanol/acetonitrile extraction were higher compared with using the aqueous mixture of methanol or acetonitrile. Extraction with methanol/acetonitrile (1:1) yielded more consistent recovery across the HCT range of 20-70% than using methanol alone, with good linearity, accuracy and precision achieved from 1 to 2000 ng/ml...
January 19, 2017: Bioanalysis
https://www.readbyqxmd.com/read/28074669/implementation-of-a-novel-ultra-fast-metabolic-stability-analysis-method-using-exact-mass-tof-ms
#15
Joseph D Manna, Samantha J Richardson, Mehran F Moghaddam
AIM: Increasing numbers of compounds requiring stability data means highly optimized methods capable of rapid turnaround are desirable during early discovery. Materials and methods/results: An advanced, generic analytical workflow for metabolic stability has been developed that utilizing ballistic gradient LC (sub 1 min run times), exact mass TOF-MS (Waters Xevo-G2-XS Q-TOF) and automated data processing (Waters UNIFI software) allowed for rapid integration and interpretation of all data produced, eliminating the need for method development and manual processing...
January 11, 2017: Bioanalysis
https://www.readbyqxmd.com/read/28071134/rapid-prototyping-using-3d-printing-in-bioanalytical-research
#16
Chengsen Zhang, Brandon J Bills, Nicholas E Manicke
No abstract text is available yet for this article.
January 10, 2017: Bioanalysis
https://www.readbyqxmd.com/read/28220712/a-novel-quantitative-method-for-recovering-precipitated-uric-acid-in-urine-and-analysis-by-lc-ms-ms
#17
Lifang Sun, Dongmei Zhou, David M Wilson
AIM: Precipitation of uric acid (UA) in human urine had caused poor recovery and underestimation of UA in study samples. RESULTS: A UA recovery method was developed for analyzing frozen urine samples that potentially contain precipitated UA. Samples were treated with 3% v/v of a solution containing 8 M potassium hydroxide and 20% v/v of ammonium thioglycolate. The high pH enables rapid dissolution of UA crystals, while the thioglycolate protects UA from oxidation at high pH...
March 2017: Bioanalysis
https://www.readbyqxmd.com/read/28220711/comparison-of-hba1c-detection-in-whole-blood-and-dried-blood-spots-using-an-automated-ion-exchange-hplc-system
#18
Aleksandra Maleska, Christophe Hirtz, Elise Casteleyn, Orianne Villard, Jacques Ducos, Antoine Avignon, Ariane Sultan, Sylvain Lehmann
AIM: Hemoglobin A1c (HbA1c) is a widely recognized analyte for diagnosing and monitoring diabetes. Dried blood spot (DBS) constitutes a useful alternative to blood collection by venipuncture. Analytical and clinical validation of DBS use is, however, necessary before implementation. Results/methodology: HbA1c levels from whole blood or DBS from a cohort patients with diabetes were compared. DBS specimens were stable at ambient temperature. HbA1c detection on DBS was accurate, robust, and the correlation and agreement with whole blood values was excellent...
March 2017: Bioanalysis
https://www.readbyqxmd.com/read/28111963/development-and-validation-of-lc-ms-ms-with-in-source-collision-induced-dissociation-for-the-quantification-of-pegcantratinib-in-human-skin-tumors
#19
Monique Zangarini, Neil Rajan, Marina Danilenko, Philip Berry, Silvio Traversa, Gareth J Veal
AIM: Pegcantratinib is a mini-PEGylated K252a derivative, under clinical evaluation as an anticancer agent acting through inhibition of the tropomyosin receptor kinase. A method for quantifying pegcantratinib in skin tumor biopsies of patients was required to determine tumor drug penetration. METHODS & RESULTS: A sensitive and PEGylated molecule specific HPLC-MS/MS method coupled with in-source collision-induced dissociation was developed. The method exhibited excellent precision (coefficient of variation ≤8...
February 2017: Bioanalysis
https://www.readbyqxmd.com/read/28111961/an-ultra-sensitive-lc-ms-ms-method-to-determine-midazolam-levels-in-human-plasma-development-validation-and-application-to-a-clinical-study
#20
Mu Chen, Wenzhe Lu, Yang Lu, Lijuan Kang, Harry Zhao, Zhongping John Lin, Weimin Wang, Daniela Fraier, Giorgio Ottaviani
AIM: Midazolam is a commonly used marker substrate for the in vivo assessment of CYP3A activity. Reliable pharmacokinetic assessment at sub-pharmacological doses of midazolam requires an ultra-sensitive analytical method. METHODS: A new, ultra-sensitive LC-MS/MS method for the determination of midazolam in human plasma using SPE was developed and fully validated. The lowest limit of quantitation is 0.1 pg/ml with a sample volume of 500 μl. RESULTS/CONCLUSION: The following parameters were validated: sensitivity, assay accuracy and precision, linearity, selectivity, and stability of midazolam at pertinent analytical and storage conditions...
February 2017: Bioanalysis
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