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Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences

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https://www.readbyqxmd.com/read/27907867/adsorption-characteristics-of-adsorbent-resins-and-antioxidant-capacity-for-enrichment-of-phenolics-from-two-phase-olive-waste
#1
Zhihong Wang, Chengzhang Wang, Jiaojiao Yuan, Changwei Zhang
In this study, the adsorption properties of nine resins including polyamide resin (30-60), polyamide resin (60-100) AB-8, S-8, D-101, NKA-9, NKA-II, XDA-1 and XDA-4 for enrichment phenolics of the olive waste were investigated. XDA-1 and NKA-II were chosen for further study due to their outstanding adsorption and desorption capacity. XDA-1 and NKA-II had similar adsorption and desorption behaviors for phenolics of olive waste. The adsorption mechanism could be better explained by pseudo second-order kinetics model and Freundlich isotherm model, and the adsorption processes were spontaneously and exothermic...
November 24, 2016: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/27907870/immunochromatographic-determination-of-bacopaside-i-in-biological-samples
#2
Sontaya Sookying, Dumrongsak Pekthong, Sarawut Oo-Puthinan, Watoo Phrompittayarat, Waraporn Putalun, Hiroyuki Tanaka, Jie Xing, Zhaoqi Zhan, Nantaka Khorana, Nitra Nuengchamnong, Kornkanok Ingkaninan
We describe a novel immunochromatographic method for qualitative and quantitative analyses of bacopaside I, a bioactive constituent in Bacopa monnieri (L.) Wettst in biological samples. The assay was performed on polyethersulfone membrane using a polyclonal antibody raised against bacopaside I. The finalised method could quantitatively determine bacopaside I in the range of 31.3-1000.0ng and the detection and quantification limits were 1.0 and 31.3ng, respectively. The percentage recoveries of bacopaside I in blood and urine were nearly 100% indicating the accuracy of the extraction...
November 23, 2016: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/27907868/purification-of-high-purity-glycyrrhizin-from-licorice-using-hydrophilic-interaction-solid-phase-extraction-coupled-with-preparative-reversed-phase-liquid-chromatography
#3
Wenyi Yu, Hongli Jin, Aijin Shen, Liang Deng, Jianlian Shi, Xingya Xue, Yadong Guo, Yanfang Liu, Xinmiao Liang
Glycyrrhizin (GA), a major bioactive compound in licorice, has been extensively used throughout the world as a medicine to treat chronic viral hepatitis and allergic dermatitis. In this study, a new method based on hydrophilic interaction solid phase extraction (HILIC-SPE) and preparative reversed-phase liquid chromatography (prep-RPLC) was developed to purify GA with high purity from the complex licorice extract. Via evaluation of retention behavior of GA and flavonoids in different commercially available columns, a hydrophilic column--Click XIon was finally chosen for the purification due to its excellent resolution toward GA and flavonoids under HILIC mode...
November 23, 2016: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/27898364/liquid-chromatography-tandem-mass-spectrometry-assay-for-the-quantification-of-niraparib-and-its-metabolite-m1-in-human-plasma-and-urine
#4
L van Andel, Z Zhang, S Lu, V Kansra, S Agarwal, L Hughes, M M Tibben, A Gebretensae, H Rosing, J H M Schellens, J H Beijnen
Niraparib (MK-4827) is a novel poly(ADP-Ribose) polymerase (PARP) inhibitor currently investigated in phase III clinical trials to treat cancers. The development of a new drug includes the characterisation of absorption, metabolism and excretion (AME) of the compound. AME studies are a requirement of regulatory agencies and for this purpose bioanalytical assays are essential. This article describes the development and validation of a bioanalytical assay for niraparib and its carboxylic acid metabolite M1 in human plasma and urine using liquid chromatography-tandem mass spectrometry (LC-MS/MS)...
November 19, 2016: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/27898365/capillary-electrophoresis-with-online-stacking-in-combination-with-agnps-mcm-41-reinforced-hollow-fiber-solid-liquid-phase-microextraction-for-quantitative-analysis-of-capecitabine-and-its-main-metabolite-5-fluorouracil-in-plasma-samples-isolated-from-cancer
#5
Mehrdad Forough, Khalil Farhadi, Rahim Molaei, Hedayat Khalili, Ramin Shakeri, Asghar Zamani, Amir Abbas Matin
The purpose of this study is the development and validation of a simple, novel, selective and fast off-line microextraction technique combining capillary electrophoresis with in-column field-amplified sample injection (FASI) for the simultaneous determination of capecitabine (CAP) and its active metabolite, 5-Fluorouracil (5-FU), in human plasma. At the moment, there is a lack of using cost-effective CE tool combined with novel miniaturized sample clean-up techniques for analysis of these important anti-cancer agents in plasma samples...
November 18, 2016: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/27889515/quality-assessment-of-traditional-chinese-medicine-using-hplc-pad-combined-with-tchebichef-image-moments
#6
Xue Wang, Bao Qiong Li, Min Li Xu, Jin Jin Liu, Hong Lin Zhai
Traditional Chinese medicines have gotten growing attention and the product quality also became uneven. In this paper, Tchebichef image moments coupled with high performance liquid chromatography with photodiode array detector were proposed to the similarity analysis of the fourteen batches of Pudilan Xiaoyan tablets (Chinese medicine complex), which were based on the grayscale images of three dimensional (3D) fingerprint spectra. Hierarchical cluster analysis was used for displaying the classification results...
November 18, 2016: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/27907869/is-a-deuterated-internal-standard-appropriate-for-the-reliable-determination-of-olmesartan-in-human-plasma
#7
Edyta Piórkowska, Jacek Musijowski, Katarzyna Buś-Kwaśnik, Piotr J Rudzki
A right choice of the internal standard is one of the most challenging tasks during bioanalytical method development. Surprisingly, among the HPLC-MS methods for the determination of a cardiovascular drug olmesartan in plasma only structural analogues or similar compounds were used as internal standards. We have tried to answer the question whether the stable isotope labelled (deuterated) internal standard, as recommended by regulatory agencies, can be used for the reliable determination of olmesartan in human plasma...
November 16, 2016: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/27912158/direct-detection-of-phenylephrine-3-o-sulfate-in-ls180-human-intestinal-cells-using-a-novel-hydrophilic-interaction-liquid-chromatography-hilic-assay
#8
Heta N Shah, Matthew T Halquist, Phillip M Gerk
The efficacy of phenylephrine (PE) is controversial due to its extensive pre-systemic metabolism through sulfation to form phenylephrine-3-O-sulfate (PES). Hence quantitation of PES is important in order to study the metabolism of PE. There are no published methods available for direction detection of PES. We have developed and validated a hydrophilic interaction liquid chromatography (HILIC) method for the direct detection of PES and simultaneous detection of PE to study the enzyme kinetics and metabolism of PE to enable approaches to reduce the presystemic metabolism of PE...
November 13, 2016: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/27880928/determination-of-red-blood-cell-fatty-acid-profiles-rapid-and-high-confident-analysis-by-chemical-ionization-gas-chromatography-tandem-mass-spectrometry
#9
Yvonne Schober, Hans Günther Wahl, Harald Renz, Wolfgang Andreas Nockher
Cellular fatty acid (FA) profiles have been acknowledged as biomarkers in various human diseases. Nevertheless, common FA analysis by gas chromatography mass spectrometry (GC-MS) requires long analysis time. Hence, there is a need for feasible methods for high throughput analysis in clinical studies. FA was extracted from red blood cells (RBC) and derivatized to fatty acid methyl esters (FAME). A method using gas chromatography tandem mass spectrometry (GC-MS/MS) with ammonia-induced chemical ionization (CI) was developed for the analysis of FA profiles in human RBC...
November 13, 2016: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/27866845/untargeted-serum-metabolomics-reveals-fu-zhu-jiang-tang-tablet-and-its-optimal-combination-improve-an-impaired-glucose-and-lipid-metabolism-in-type-ii-diabetic-rats
#10
Yi Tao, Xi Chen, Hao Cai, Weidong Li, Baochang Cai, Chuan Chai, Liuqing Di, Liyun Shi, Lihong Hu
Fu-Zhu-Jiang-Tang tablet, a six-herb preparation, was proved to show beneficial effects on type II diabetes patients in clinical. This study aims to optimize the component proportion of the six-herb preparation and explore the serum metabolic signatures of type II diabetes rats after treatment with Fu-Zhu-Jiang-Tang tablet and its optimal combination. The component proportion of the preparation was optimized using uniform experimental design and machine learning techniques. Untargeted GC-MS metabolomic experiments were carried out with serum samples from model group and treatment groups...
November 13, 2016: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/27856196/a-fabric-phase-sorptive-extraction-high-performance-liquid-chromatography-photo-diode-array-detection-method-for-the-determination-of-twelve-azole-antimicrobial-drug-residues-in-human-plasma-and-urine
#11
Marcello Locatelli, Abuzar Kabir, Denise Innosa, Teresa Lopatriello, Kenneth G Furton
This paper reports a novel fabric phase sorptive extraction-high performance liquid chromatography-photodiode array detection (FPSE-HPLC-PDA) method for the simultaneous extraction and analysis of twelve azole antimicrobial drug residues that include ketoconazole, terconazole, voriconazole, bifonazole, clotrimazole, tioconazole, econazole, butoconazole, miconazole, posaconazole, ravuconazole, and itraconazole in human plasma and urine samples. The selected azole antimicrobial drugs were well resolved by using a Luna C18 column (250mm×4...
November 11, 2016: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/27884570/a-gc-ms-method-for-the-detection-and-quantitation-of-ten-major-drugs-of-abuse-in-human-hair-samples
#12
A Orfanidis, O Mastrogianni, A Koukou, G Psarros, H Gika, G Theodoridis, N Raikos
A sensitive analytical method has been developed in order to identify and quantify major drugs of abuse (DOA), namely morphine, codeine, 6-monoacetylmorphine, cocaine, ecgonine methyl ester, benzoylecgonine, amphetamine, methamphetamine, methylenedioxymethamphetamine and methylenedioxyamphetamine in human hair. Samples of hair were extracted with methanol under ultrasonication at 50°C after a three step rinsing process to remove external contamination and dirt hair. Derivatization with BSTFA was selected in order to increase detection sensitivity of GC/MS analysis...
November 10, 2016: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/27866847/detection-of-trans-fatty-acids-by-high-performance-liquid-chromatography-coupled-with-in-tube-solid-phase-microextraction-using-hydrophobic-polymeric-monolith
#13
Fangling Wu, Jiabin Wang, Qi Zhao, Nan Jiang, Xucong Lin, Zenghong Xie, Jianhua Li, Qiqing Zhang
Based on in-tube solid-phase microextraction (in-tube SPME) using a hydrophobic poly (octadecyl methacrylate-co-ethylene dimethacrylate) [poly (OMA-co-EDMA)] monolith, a simple high performance liquid chromatography (HPLC) method has been developed for detection of trans-fatty acids (TFAs) as their fatty acid methyl esters (FAMEs). The poly (OMA-co-EDMA) monolithic column with high hydrophobicity was specially prepared for simultaneous microextraction, pre-separation and purification for the analytes. The pre-separation selectivity, the extraction efficiency, and the purification effect for FAMEs were investigated respectively...
November 10, 2016: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/27866846/determination-of-enantiomeric-vigabatrin-by-derivatization-with-diacetyl-l-tartaric-anhydride-followed-by-ultra-high-performance-liquid-chromatography-quadrupole-time-of-flight-mass-spectrometry
#14
Jing Zhao, Yujin Shin, Yan Jin, Kyung Min Jeong, Jeongmi Lee
Vigabatrin, one of the most widely used antiepileptic drugs, is marketed and administered as a racemic mixture, while only S-enantiomer is therapeutically effective. In the present study, diacetyl-l-tartaric acid anhydride was used as an inexpensive and effective chiral derivatization reagent to produce tartaric acid monoester derivatives of vigabatrin enantiomers that could be readily resolved by reversed phase chromatography. Derivatization conditions were statistically optimized by response surface methodology, resulting in an optimal reaction temperature of 44°C and an optimal reaction time of 30min...
November 10, 2016: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/27856195/detection-of-dexmedetomidine-in-human-breast-milk-using-liquid-chromatography-tandem-mass-spectrometry-application-to-a-study-of-drug-safety-in-breastfeeding-after-cesarean-section
#15
Rika Nakanishi, Manabu Yoshimura, Manabu Suno, Kento Yamamoto, Haruka Ito, Yohei Uchimine, Takashi Toriumi, Atsushi Kurosawa, Ami Sugawara, Takayuki Kunisawa
Several analytical methods for dexmedetomidine (DEX) in human plasma have been published, but quantification of DEX in human breast milk has not been described. In this article, we describe a high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) method suitable for quantification of DEX in human breast milk. DEX and an internal standard were extracted in a single liquid-liquid extraction step with diethyl ether from 200μL of human breast milk. HPLC was performed on a TSK-gel ODS-100V column with isocratic elution at a flow rate of 0...
November 10, 2016: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/27856194/determination-of-%C3%AE-hydroxy-%C3%AE-methylbutyrate-concentration-and-enrichment-in-human-plasma-using-chemical-ionization-gas-chromatography-tandem-mass-spectrometry
#16
Dillon K Walker, John J Thaden, Agata Wierzchowska-McNew, Marielle P K J Engelen, Nicolaas E P Deutz
Our objective was to develop a quick and simplified method for the determination of β-Hydroxy-β-methylbutyrate (HMB) and ɑ-ketoisocaproic acid (KIC) concentrations and enrichments by GC/MS/MS to determine the turnover rate of HMB in humans. In experiment 1, we provided a pulse of L-[5,5,5-(2)H3]leucine to younger adults in the postabsorptive state then collected blood samples over a 4h time period. In experiment 2, we provided a pulse of [3,4,methyl-(13)C3]HMB to older adults in the postabsorptive state then collected blood samples over a 3h time period...
November 9, 2016: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/27855313/characterization-of-the-clostridium-difficile-volatile-metabolome-using-comprehensive-two-dimensional-gas-chromatography-time-of-flight-mass-spectrometry
#17
Christiaan A Rees, Aimee Shen, Jane E Hill
Clostridium difficile is a bacterial pathogen capable of causing life-threatening infections of the gastrointestinal tract characterized by severe diarrhea. Exposure to certain classes of antibiotics, advanced age, and prolonged hospitalizations are known risk factors for infection by this organism. Anecdotally, healthcare providers have reported that they can smell C. difficile infections in their patients, and several studies have suggested that there may indeed be an olfactory signal associated with C. difficile-associated diarrhea...
November 9, 2016: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/27847150/hormonal-profiling-development-of-a-simple-method-to-extract-and-quantify-phytohormones-in-complex-matrices-by-uhplc-ms-ms
#18
Carolina Delatorre, Ana Rodríguez, Lucía Rodríguez, Juan P Majada, Ricardo J Ordás, Isabel Feito
Plant growth regulators (PGRs) are very different chemical compounds that play essential roles in plant development and the regulation of physiological processes. They exert their functions by a mechanism called cross-talk (involving either synergistic or antagonistic actions) thus; it is for great interest to study as many PGRs as possible to obtain accurate information about plant status. Much effort has been applied to develop methods capable of analyze large numbers of these compounds but frequently excluding some chemical families or important PGRs within each family...
November 9, 2016: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/27846433/validated-quantification-method-for-five-ephedrines-in-dietary-supplements-using-lc-ms-ms-application-to-503-cases
#19
Jianli Zhang, Yinong Zhang, Yan Wang
Ephedrines in dietary supplements can arise from herbs or illegal adulteration so a liquid chromatography tandem mass spectrometry (LC-MS/MS) method was developed for separation and quantification of ephedrine, pseudoephedrine, norephedrine, norepseudoephedrine, and methyl-ephedrine, some of which are isomer pairs of pseudo-structures. This method includes liquid-liquid extraction of ephedrines from three typical dietary supplement matrices-solid, liquid, and oil-as well as liquid chromatographic separation...
November 9, 2016: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/27838180/corrigendum-to-simultaneous-measurement-of-etravirine-maraviroc-and-raltegravir-in-pigtail-macaque-plasma-vaginal-secretions-and-vaginal-tissue-using-a-lc-ms-ms-assay-j-chromatogr-b-1025-2016-110-118
#20
Anna K Blakney, Yonghou Jiang, Dale Whittington, Kim A Woodrow
No abstract text is available yet for this article.
November 9, 2016: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
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