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Liquid Chromatography tandem mass spectrometry

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https://www.readbyqxmd.com/read/28092104/quantitative-proteomic-analysis-of-gingival-crevicular-fluids-from-deciduous-and-permanent-teeth
#1
Yumi Moriya, Takashi Obama, Toshihiro Aiuchi, Tomomi Sugiyama, Yumiko Endo, Yoko Koide, Emiko Noguchi, Motonori Ishizuka, Mitsuko Inoue, Hiroyuki Itabe, Matsuo Yamamoto
AIM: Gingivitis commonly progresses to periodontitis in permanent dentition but rarely in deciduous teeth. Little is known about the biochemical differences between gingiva of deciduous and permanent teeth. Here we compared the protein profiles of gingival crevicular fluids (GCF) from the gingiva of deciduous and permanent teeth. MATERIALS AND METHODS: Forty children with mixed dentition (Hellman's dental age IIIA) were selected and GCF samples were collected from deciduous cuspids and central incisors in the maxilla...
January 16, 2017: Journal of Clinical Periodontology
https://www.readbyqxmd.com/read/28091797/mass-spectrometric-identification-of-phenol-soluble-modulins-in-the-atcc%C3%A2-43300-standard-strain-of-methicillin-resistant-staphylococcus-aureus-harboring-two-distinct-phenotypes
#2
K S Jang, M Park, J Y Lee, J S Kim
Staphylococcus aureus subsp. aureus Rosenbach (ATCC® 43300™) is a representative methicillin-resistant S. aureus (MRSA) strain that is used as a quality control strain for testing the methicillin susceptibility of clinical isolates. It has been consistently observed that colonies with two different colors (golden yellow and white) grow from the ATCC stock on blood agar plates. In this study, staphylococcal peptide and protein profiling was performed using matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry...
January 14, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28089749/pyroglutamate-5-oxoproline-measured-with-hydrophilic-interaction-chromatography-hilic-tandem-mass-spectrometry-in-acutely-ill-patients
#3
Carel J Pretorius, Michael C Reade, Chris Warnholtz, Brett McWhinney, Meng Mei Phua, Jeffrey Lipman, Jacobus P J Ungerer
BACKGROUND: Pyroglutamic acid (PGA) is challenging to quantify in plasma and is a rare cause of metabolic acidosis that is associated with inherited disorders or acquired after exposure to drugs. METHOD: We developed a hydrophilic interaction liquid chromatography tandem mass spectrometry method with a short analysis time. We established a reference interval and then measured PGA in acutely ill patients to investigate associations with clinical, pharmaceutical and laboratory parameters...
January 12, 2017: Clinica Chimica Acta; International Journal of Clinical Chemistry
https://www.readbyqxmd.com/read/28088283/quantification-of-plasma-sulfatides-by-mass-spectrometry-utility-for-metachromatic-leukodystrophy
#4
Jennifer T Saville, Nicholas J C Smith, Janice M Fletcher, Maria Fuller
Impaired sulfatide catabolism is the primary biochemical insult in patients with the inherited neurodegenerative disease, metachromatic leukodystrophy (MLD), and sulfatide elevation in body fluids is useful in the diagnostic setting. Here we used mass spectrometry to quantify fourteen species of sulfatide, in addition to the deacetylated derivative, lyso-sulfatide, using high pressure liquid chromatography-electrospray ionisation-tandem mass spectrometry in both positive and negative ion mode. A single phase extraction of 0...
February 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28088045/uhplc-ms-ms-method-for-the-quantitation-of-penicillin-g-and-metabolites-in-citrus-fruit-using-internal-standards
#5
Daniele Canzani, Kevin Hsieh, Matthew Standland, Walter Hammack, Fadi Aldeek
Penicillin G has been applied to citrus trees as a potential treatment in the fight against Huanglongbing (HLB). Here, we have developed and validated a method to identify and quantitate penicillin G and two of its metabolites, penillic acid and penilloic acid, in citrus fruit using ultra high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS). This method improves upon a previous method by incorporating isotopically labeled internal standards, namely, penillic acid-D5, and penilloic acid-D5...
January 10, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28088025/residues-of-2-hydroxy-3-phenylpyrazine-a-degradation-product-of-some-%C3%AE-lactam-antibiotics-in-environmental-water-in-vietnam
#6
Nguyen Van Sy, Kazuo Harada, Megumi Asayama, Minae Warisaya, Le Hong Dung, Yoshinori Sumimura, Khong Thi Diep, Le Viet Ha, Nguyen Nam Thang, Tran Thi Tuyet Hoa, Tran Minh Phu, Pham Ngoc Khai, Nguyen Thanh Phuong, Le Danh Tuyen, Yoshimasa Yamamoto, Kazumasa Hirata
Antibiotic-resistant bacteria have become a serious problem worldwide, caused in part by the excessive use and discharge of antibiotics into the environment. Ampicillin (ABPC) is a widely used antibiotic. However, this chemical rapidly decomposes in water containing divalent cations like Ca(2+) and Mg(2+), thus, detection of ABPC in environmental water is difficult. This study was carried out to evaluate the presence of 2-hydroxy-3-phenylpyrazine (HPP), one of the degradation products of ABPC and β-lactam antibiotics with an ABPC substructure, in environmental water...
January 2, 2017: Chemosphere
https://www.readbyqxmd.com/read/28087463/effect-of-22-cyp2d6-variants-found-in-the-chinese-population-on-tolterodine-metabolism-in-vitro
#7
Hao Wang, Da-Peng Dai, Peng Sun, Li-Ping Xu, Bing-Qing Liang, Jian-Ping Cai, Guo-Xin Hu
Cytochrome P450 2D6 (CYP2D6) is an important member of the cytochrome P450 enzyme superfamily. We recently identified 22 novel variants in the Chinese population using PCR and bidirectional sequencing methods. The aim of this study is to characterize the enzymatic activity of these variants and their effects on the metabolism of the antimuscarinic drug tolterodine in vitro. A baculovirus-mediated expression system was used to express wild-type CYP2D6 and 24 variants (CYP2D6*2, CYP2D6*10, and 22 novel CYP2D6 variants) at high levels...
January 10, 2017: Chemico-biological Interactions
https://www.readbyqxmd.com/read/28087279/alpha-2-macroglobulin-and-heparin-cofactor-ii-and-the-vulnerability-of-carotid-atherosclerotic-plaques-an-itraq-based-analysis
#8
Jinmao Li, Xi Liu, Ying Xiang, Xueying Ding, Teng Wang, Ying Liu, Maojia Yin, Changhong Tan, Fen Deng, Lifen Chen
Rupture of carotid atherosclerotic plaque may cause stroke, while few biomarker in clinic can evaluate carotid plaque vulnerability. In this study, we divided the recruited participants into no plaque, stable plaque, and vulnerable plaque group according to carotid ultrasonography, and screened the differentially expressed proteins in plasma of these participants using isobaric tags for relative and absolute quantitation labeling coupled with liquid chromatography-tandem mass spectrometry. 28 proteins were identified differentially expressed, among which alpha-2-macroglobulin (α2M) and heparin cofactor II (HCII) were found to be at hub position in the interactions of these proteins by STRING analysis and were selected for enzyme-linked immunosorbent assay measurement to assess their relevance with carotid plaques vulnerability and diagnostic efficiency...
January 10, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28087055/graft-modification-of-cotton-with-phosphate-group-and-its-application-to-the-enrichment-of-phosphopeptides
#9
Xiao-Mei He, Xi Chen, Bi-Feng Yuan, Yu-Qi Feng
Grafting copolymerization, especially "grafting from" approach, has attracted a great attention for the preparation of cellulose-based materials with various functionalities. In this study, a novel phosphate group-containing cotton fiber-based material, CF-NH2-AZO-p(VPA-x), was successfully synthesized by a "grafting from" radical polymerization approach using vinyl phosphonic acid (VPA) as monomer. The phosphate group content of CF-NH2-AZO-p(VPA-x) could be easily regulated by adjusting the concentration of VPA monomer...
January 9, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28086912/wwl70-attenuates-pge2-production-derived-from-2-arachidonoylglycerol-in-microglia-by-abhd6-independent-mechanism
#10
Mikiei Tanaka, Sean Moran, Jie Wen, Kwame Affram, Tinghua Chen, Aviva J Symes, Yumin Zhang
BACKGROUND: α/β-Hydrolase domain 6 (ABHD6) is one of the major enzymes for endocannabinoid 2-arachidonoylglycerol (2-AG) hydrolysis in microglia cells. Our recent studies have shown that a selective ABHD6 inhibitor WWL70 has anti-inflammatory and neuroprotective effects in animal models of traumatic brain injury and multiple sclerosis. However, the role of ABHD6 in the neuroinflammatory response and the mechanisms by which WWL70 suppresses inflammation has not yet been elucidated in reactive microglia...
January 10, 2017: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/28081507/occurrence-fate-and-environmental-risk-of-linear-alkylbenzene-sulfonate-in-the-langat-and-selangor-river-basins-malaysia
#11
Nobumitsu Sakai, Junichi Shirasaka, Yasuto Matsui, Mohd Redzuan Ramli, Kousuke Yoshida, Mustafa Ali Mohd, Minoru Yoneda
Five homologs (C10-C14) of linear alkylbenzene sulfonate (LAS) were quantitated in surface water collected in the Langat and Selangor River basins using liquid chromatography-tandem mass spectrometry (LC-MS/MS). A geographic information system (GIS) was used to spatially analyze the occurrence of LAS in both river basins, and the LAS contamination associated with the population was elucidated by spatial analysis at a sub-basin level. The LAS concentrations in the dissolved phase (<0.45 μm) and 4 fractions separated by particle size (<0...
December 31, 2016: Chemosphere
https://www.readbyqxmd.com/read/28081498/enhancing-analysis-throughput-sensitivity-and-specificity-in-lc-esi-ms-ms-assay-of-plasma-25-hydroxyvitamin-d3-by-derivatization-with-triplex-4-4-dimethylaminophenyl-1-2-4-triazoline-3-5-dione-daptad-isotopologues
#12
Shoujiro Ogawa, Hiroki Kittaka, Akiho Nakata, Kenji Komatsu, Takahiro Sugiura, Mamoru Satoh, Fumio Nomura, Tatsuya Higashi
The plasma/serum concentration of 25-hydroxyvitamin D3 [25(OH)D3] is a diagnostic index for vitamin D deficiency/insufficiency, which is associated with a wide range of diseases, such as rickets, cancer and diabetes. We have reported that the derivatization with 4-(4-dimethylaminophenyl)-1,2,4-triazoline-3,5-dione (DAPTAD) works well in the liquid chromatography/electrospray ionization-tandem mass spectrometry (LC/ESI-MS/MS) assay of the serum/plasma 25(OH)D3 for enhancing the sensitivity and the separation from a potent interfering metabolite, 3-epi-25-hydroxyvitamin D3 [3-epi-25(OH)D3]...
November 17, 2016: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28080998/determination-of-oxycodone-and-its-major-metabolites-noroxycodone-and-oxymorphone-by-ultra-high-performance-liquid-chromatography-tandem-mass-spectrometry-in-plasma-and-urine-application-to-real-cases
#13
Flaminia Pantano, Stefano Brauneis, Alexandre Forneris, Roberta Pacifici, Enrico Marinelli, Chrystalla Kyriakou, Simona Pichini, Francesco Paolo Busardò
BACKGROUND: Oxycodone is a narcotic drug widely used to alleviate moderate and severe acute and chronic pain. Variability in analgesic efficacy could be explained by inter-subject variations in plasma concentrations of parent drug and its active metabolite, oxymorphone. To evaluate patient compliance and to set up therapeutic drug monitoring (TDM), an ultra-high-performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) assay was developed and validated for the parent drug and its major metabolites noroxycodone and oxymorphone...
January 12, 2017: Clinical Chemistry and Laboratory Medicine: CCLM
https://www.readbyqxmd.com/read/28077380/metabolomic-profiles-as-reliable-biomarkers-of-dietary-composition
#14
Tõnu Esko, Joel N Hirschhorn, Henry A Feldman, Yu-Han H Hsu, Amy A Deik, Clary B Clish, Cara B Ebbeling, David S Ludwig
BACKGROUND: Clinical nutrition research often lacks robust markers of compliance, complicating the interpretation of clinical trials and observational studies of free-living subjects. OBJECTIVE: We aimed to examine metabolomics profiles in response to 3 diets that differed widely in macronutrient composition during a controlled feeding protocol. DESIGN: Twenty-one adults with a high body mass index (in kg/m(2); mean ± SD: 34.4 ± 4.9) were given hypocaloric diets to promote weight loss corresponding to 10-15% of initial body weight...
January 11, 2017: American Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28077236/high-resolution-ultrahigh-pressure-long-column-reversed-phase-liquid-chromatography-for-top-down-proteomics
#15
Yufeng Shen, Nikola Tolić, Paul D Piehowski, Anil K Shukla, Sangtae Kim, Rui Zhao, Yi Qu, Errol Robinson, Richard D Smith, Ljiljana Paša-Tolić
Separation of proteoforms for global intact protein analysis (i.e. top-down proteomics) has lagged well behind what is achievable for peptides in traditional bottom-up proteomic approach and is becoming a true bottle neck for top-down proteomics. Herein, we report use of long (≥1M) columns containing short alkyl (C1-C4) bonded phases to achieve high-resolution RPLC for separation of proteoforms. At a specific operation pressure limit (i.e., 96.5MPa or 14Kpsi used in this work), column length was found to be the most important factor for achieving maximal resolution separation of proteins when 1...
January 5, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28076309/activation-of-the-tryptophan-serotonin-pathway-is-associated-with-severity-and-predicts-outcomes-in-pneumonia-results-of-a-long-term-cohort-study
#16
Marc A Meier, Manuel Ottiger, Alaadin Vögeli, Christian Steuer, Luca Bernasconi, Robert Thomann, Mirjam Christ-Crain, Christoph Henzen, Claus Hoess, Werner Zimmerli, Andreas Huber, Beat Mueller, Philipp Schuetz
BACKGROUND: As part of the immune defense during infection, an increase in enzyme activity of indoleamine 2,3-dioxygenase (IDO) leads to a breakdown of tryptophan to kynurenine. In previous animal studies, therapeutic antagonism of IDO resulted in reduced sepsis mortality. We investigated the prognostic ability of tryptophan, serotonin, kynurenine and IDO (represented by the ratio of kynurenine/tryptophan) to predict adverse clinical outcomes in patients with community-acquired pneumonia (CAP)...
January 11, 2017: Clinical Chemistry and Laboratory Medicine: CCLM
https://www.readbyqxmd.com/read/28076306/parallel-diurnal-fluctuation-of-testosterone-androstenedione-dehydroepiandrosterone-and-17ohprogesterone-as-assessed-in-serum-and-saliva-validation-of-a-novel-liquid-chromatography-tandem-mass-spectrometry-method-for-salivary-steroid-profiling
#17
Marco Mezzullo, Alessia Fazzini, Alessandra Gambineri, Guido Di Dalmazi, Roberta Mazza, Carla Pelusi, Valentina Vicennati, Renato Pasquali, Uberto Pagotto, Flaminia Fanelli
BACKGROUND: Salivary androgen testing represents a valuable source of biological information. However, the proper measurement of such low levels is challenging for direct immunoassays, lacking adequate accuracy. In the last few years, many conflicting findings reporting low correlation with the serum counterparts have hampered the clinical application of salivary androgen testing. Liquid chromatography-tandem mass spectrometry (LC-MS/MS) makes it possible to overcome previous analytical limits, providing new insights in endocrinology practice...
January 11, 2017: Clinical Chemistry and Laboratory Medicine: CCLM
https://www.readbyqxmd.com/read/28076304/the-use-of-liquid-chromatography-tandem-mass-spectrometry-for-therapeutic-drug-monitoring-of-antibiotics-in-cancer-patients
#18
Nahed El-Najjar, Jonathan Jantsch, André Gessner
Cancer remains a leading cause of mortality and morbidity worldwide. In addition to organ failure, the most frequent reasons for admission of cancer patients to intensive care units (ICU) are: infections and sepsis. As critically ill, the complexity of the health situation of cancer patients renders the standard antimicrobial regimen more complex and even inadequate which results in increased mortality rates. This is due to pathophysiological changes in the volume of distribution, increased clearance, as well as to organ dysfunction...
January 11, 2017: Clinical Chemistry and Laboratory Medicine: CCLM
https://www.readbyqxmd.com/read/28075189/11-analytically-confirmed-cases-of-mexedrone-use-among-polydrug-users
#19
Liam Roberts, Loretta Ford, Neel Patel, J Allister Vale, Sally M Bradberry
INTRODUCTION: Mexedrone, 3-methoxy-2-(methylamino)-1-(4-methylphenyl)propan-1-one, is the alpha-methoxy-derivative of mephedrone (4-methyl-N-methyl cathinone). Mexedrone inhibits the re-uptake of serotonin and dopamine in a dose-dependent manner and has affinity for serotonin and dopamine membrane transporters and receptors (5-HT2 and D2 receptors), producing sympathomimetic effects similar to amfetamines. To date there are no published clinical reports on mexedrone use that are analytically confirmed...
January 11, 2017: Clinical Toxicology
https://www.readbyqxmd.com/read/28073982/urinary-triclosan-concentrations-and-early-outcomes-of-in-vitro-fertilization-embryo-transfer
#20
Rui Hua, Yao Zhou, Biao Wu, Zhongwei Huang, Yongtong Zhu, Yali Song, Yanhong Yu, Hong Li, Song Quan
Triclosan (TCS) exists ubiquitously in the environment. Several in vitro and in vivo studies have demonstrated that TCS exerts endocrine disruptive effects on reproduction, but data from human populations are limited and conflicting. The objective of our study was to investigate whether high urinary TCS concentration is adversely associated with early reproductive outcomes in women undergoing in vitro fertilization-embryo transfer (IVF-ET). This prospective cohort study was conducted from September 2015 to June 2016, including 156 infertile women undergoing their first IVF-ET cycle...
March 2017: Reproduction: the Official Journal of the Society for the Study of Fertility
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