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https://www.readbyqxmd.com/read/29153999/improving-the-selectivity-and-sensitivity-for-quantifying-8-%C3%AE-hydroxy-mutilin-in-rabbit-tissues-by-using-basic-mobile-phases-and-negative-ionization
#1
Aimin Tan, Guifen Gu, Xuan Gui, Yanxin Wu, Gordon Bolger, Albert Licollari, John C Fanaras
Previously reported LC-MS methods for quantifying 8-α-hydroxy-mutilin (a marker residue of tiamulin) in tissues all used a pseudo MRM transition (from protonated molecular ion to protonated molecular ion, m/z 337→337) due to difficulties in finding a product ion, leading to suboptimal selectivity and sensitivity for detection. By using electrospray negative ionization in a basic medium, we, for the first time, found a highly selective and sensitive true MRM transition for 8-α-hydroxy-mutilin, m/z 335→179...
November 11, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29148792/proteomic-markers-of-the-functional-sperm-population-in-bovines-1-comparison-of-low-and-high-density-spermatozoa-following-cryopreservation
#2
Olivier D'Amours, Gilles Frenette, Sylvie Bourassa, Ezequiel Calvo, Patrick Blondin, Robert Sullivan
Mammalian semen contains a heterogeneous population of sperm cells. This heterogeneity results from variability in the complex processes of cell differentiation in the testis, biochemical modifications undergone by spermatozoa during transit along the male reproductive tract, interactions with secretions from accessory sex glands at ejaculation, and, in the context of reproductive technologies, in the ability of ejaculated spermatozoa to resist damage associated with freeze-thaw procedures. When submitted to density gradient centrifugation, ejaculated spermatozoa distribute themselves into two distinct populations: a low-density population characterized by low motility parameters, and a high-density population with high motility characteristics...
November 17, 2017: Journal of Proteome Research
https://www.readbyqxmd.com/read/29142588/characterization-of-hormonal-receptors-and-human-epidermal-growth-factor-receptor-2-in-tissues-of-women-with-breast-cancer-at-muhimbili-national-hospital-dar-es-salaam-tanzania
#3
Amos Rodger Mwakigonja, Nyanda Elias Lushina, Ally Mwanga
Background: Breast cancer is a leading cause of morbidity and deaths among women worldwide. In Tanzania there is no published data on human epidermal growth receptor-2 (HER2/neu) expression in breast carcinoma. Hormonal receptors and HER2/neu status reportedly influence post-mastectomy adjuvant therapy and predict treatment outcome and prognosis. Here we evaluate hormonal receptors and HER-2 status in biopsies of women with breast cancer at Muhimbili National Hospital (MNH). Methods: A cross-sectional study of female breast post-modified radical mastectomy (MRM)/incisional biopsies confirmed to be carcinoma at the Histopathology Unit (January-December 2013)...
2017: Infectious Agents and Cancer
https://www.readbyqxmd.com/read/29139078/combination-strategy-of-quantitative-proteomics-uncovers-the-related-proteins-of-colorectal-cancer-in-the-interstitial-fluid-of-colonic-tissue-from-the-aom-dss-mouse-model
#4
Guixue Hou, Yang Wang, Xiaomin Lou, Siqi Liu
Quantitative proteome analysis using iTRAQ is an important technique to find disease-related proteins. As an important component of tumor microenvironment, tissue interstitial fluid (TIF) has drawn a great attention for its potential as a source for exploration of the solid tumor biomarkers. On the basis of a mouse model of colorectal cancer (CRC) that was induced by the carcinogenetic reagents, we adopted a quantitative proteome analysis with iTRAQ to discover the CRC-related proteins in the TIFs and with MRM to evaluate the corresponding abundance changes in the individual mouse TIF and serum samples...
November 15, 2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29136849/simultaneous-determination-of-three-estrogens-in-human-saliva-without-derivatization-or-liquid-liquid-extraction-for-routine-testing-via-miniaturized-solid-phase-extraction-with-lc-ms-ms-detection
#5
Xiaoguang Sunny Li, Shu Li, Gottfried Kellermann
Accurate quantitation of estrogens (i.e, estrone (E1), estradiol (E2) and estriol (E3)) is valuable for clinical assessment of human health and disease. Alterations in estrogen levels have been implicated in numerous pathological conditions. However, inadequacies in sensitivity and specificity, cumbersome sample preparation and invasive specimen collection hamper the usability of available methods for clinical applications. Herein, a simple, rapid, highly sensitive and specific LC-MS/MS method was developed and validated for the simultaneous determination of three estrogens in human saliva providing a non-invasive alternative to conventional blood samples...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29132024/a-hilic-uhplc-ms-ms-untargeted-urinary-metabonomics-combined-with-quantitative-analysis-of-five-polar-biomarkers-on-osteoporosis-rats-after-oral-administration-of-gushudan
#6
Xiao Wu, Yue Huang, Jinghan Sun, Yongqing Wen, Feng Qin, Longshan Zhao, Zhili Xiong
A HILIC-UHPLC-MS/MS untargeted urinary metabonomic method combined with quantitative analysis of five potential polar biomarkers in rat urine was developed and validated, to further understand the anti-osteoporosis effect of Gushudan(GSD) and its mechanism on prednisolone-induced osteoporosis(OP) rats in this study. The metabolites were separated and identified on Waters BEH HILIC (2.1mm×100mm, 1.7μm) column using the Waters ACQUITY™ ultra performance liquid chromatography system (Waters Corporation, Milford, USA) coupled with a Micromass Quattro Micro™ API mass spectrometer (Waters Corp, Milford, MA, USA)...
October 6, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29131234/the-role-of-triangular-vertebral-canal-shape-in-surgical-management-of-patients-with-lumbar-spinal-stenosis-a-cross-sectional-study
#7
Huseyin Bozkurt, İsmail Kaya, Bilge Oztoprak
AIM: We assessed the role of triangular vertebral canal shape (VCS) in pain severity, pain-related findings, and postoperative satisfaction in patients with lumbar spinal stenosis (LSS) who had undergone decompressive surgery. MATERIAL AND METHODS: This cross-sectional study conducted at a single center included 61 consecutive patients who had undergone surgical treatment for LSS. By comparing pre- and postoperative data, the role of triangular VCS in pain severity [assessed using a visual analog scale (VAS)], pain-related findings, and postoperative satisfaction of patients was examined...
October 18, 2017: Turkish Neurosurgery
https://www.readbyqxmd.com/read/29129604/simultaneous-determination-of-nine-kinds-of-dominating-bile-acids-in-various-snake-bile-by-ultrahigh-performance-liquid-chromatography-with-triple-quadrupole-linear-iontrap-mass-spectrometry
#8
Jie Zhang, Yeqin Fan, Yajun Gong, Xiaoyong Chen, Luosheng Wan, Chenggao Zhou, Jiewen Zhou, Shuangcheng Ma, Feng Wei, Jiachun Chen, Jing Nie
Snake bile is one of the most expensive traditional Chinese medicines (TCMs). However, due to the complicated constitutes of snake bile and the poor ultraviolet absorbance of some trace bile acids (BAs), effective analysis methods for snake bile acids were still unavailable, making it difficult to solve adulteration problems. In present study, ultrahigh-performance liquid chromatography with triple quadrupole linear ion trap mass spectrometry (UHPLC-QqQ-MS/MS) was applied to conduct a quantitative analysis on snake BAs...
November 9, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29128277/a-fast-sensitive-and-high-throughput-method-for-the-determination-of-esomeprazole-in-dog-plasma-by-uhplc-ms-ms-application-to-formulation-development-of-the-compound-preparation-of-esomeprazole
#9
Ran Liu, Pei Li, Jie Xiao, Yidi Yin, Zheng Sun, Kaishun Bi, Qing Li
To investigate deeply into the preclinical pharmacokinetics and prescription design of esomeprazole, a sensitive, high throughput and robust UHPLC-MS/MS method had been developed and fully validated for the analysis of esomeprazole in dog plasma. Esomeprazole and diazepam (IS) were fast extracted from plasma by alkalified organic solvent, and separated on MP-C18 column with methanol and 0.1% formic acid. The quantification of esomeprazole and IS had been achieved using fragmentation transitions of m/z 346.1→198...
November 4, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29127845/highly-sensitive-determination-of-alendronate-in-human-plasma-and-dialysate-using-metal-free-hplc-ms-ms
#10
Miho Yamada, Xiao-Pen Lee, Masaya Fujishiro, Ken Iseri, Makoto Watanabe, Hiroshi Sakamaki, Naoki Uchida, Takaaki Matsuyama, Takeshi Kumazawa, Haruo Takahashi, Akira Ishii, Keizo Sato
A highly sensitive method was developed for the analysis of alendronate in human plasma and dialysate using MonoSpin™ SAX(®) extraction and metal-free high-performance liquid chromatography (HPLC)-tandem mass spectrometry (MS/MS) following methylation with trimethylsilyldiazomethane. The chromatographic separation of the derivatives for alendronate and alendronate-d6 was achieved on an L-column2 ODS metal-free column (50 mm  ×  2 mm i.d., particle size 3 µm) with a linear gradient elution system composed of 10 mM ammonium acetate (pH 6...
November 6, 2017: Legal Medicine
https://www.readbyqxmd.com/read/29125749/lc-ms-ms-identification-of-species-specific-muscle-peptides-in-processed-animal-proteins
#11
Daniela Marchis, Alessandra Altomare, Marilena Gili, Federica Ostorero, Amina Khadjavi, Cristiano Corona, Giuseppe Ru, Benedetta Cappelletti, Silvia Gianelli, Francesca Amadeo, Cristiano Rumio, Marina Carini, Giancarlo Aldini, Cristina Casalone
An innovative analytical strategy has been applied to identify signature peptides able to distinguish among processed animal proteins (PAPs) derived from bovine, pig, fish and milk products. Proteomics was first used to elucidate the proteome of each source. Starting from the identified proteins and using a funnel based approach, a set of abundant and well characterized peptides with suitable physical-chemical properties (signature peptides) and specific for each source were selected. An on-target LC-ESI-MS/MS method (MRM mode) was set-up using standard peptides and was then applied to selectively identify the PAP source and also to distinguish proteins from bovine carcass and milk proteins...
November 10, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29125575/an-optimized-and-sensitive-pharmacokinetic-quantitative-method-of-investigating-gastrodin-parishin-and-parishin-b-c-and-e-in-beagle-dog-plasma-using-lc-ms-ms-after-intragastric-administration-of-tall-gastrodia-capsules
#12
Junqiu Liu, Sha Chen, Jintang Cheng, Jun Zhang, Yuesheng Wang, An Liu
Gastrodia elata Blume, called Tianma in China, has been widely used to treat headaches, convulsions and epilepsy for thousands of years. In the present study, a series of optimizations were employed to develop a rapid, sensitive, and reliable high-performance liquid chromatography-triple quadrupole mass spectrometry method, which was then used for the simultaneous determination of gastrodin, parishin, parishin B, parishin C and parishin E in beagle dog plasma after intragastric administration of tall Gastrodia capsules (Tianma brand)...
November 10, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29124775/capillary-hplc-with-tandem-mass-spectrometry-in-analysis-of-alkaloid-dyestuffs-a-new-approach
#13
Damian Dąbrowski, Katarzyna Lech, Maciej Jarosz
Development of the identification method of alkaloid compounds in Amur cork tree as well as not examined so far Oregon grape and European Barberry shrubs is presented. The novel approach to separation of alkaloids was applied and the capillary-high-performance liquid chromatography (capillary-HPLC) system was used, which has never previously been reported for alkaloid-based dyestuffs analysis. Its optimization was conducted with three different stationary phases (unmodified octadecylsilane-bonded silica, octadecylsilane modified with polar groups and silica-bonded pentaflourophenyls) as well as with different solvent buffers...
November 10, 2017: Electrophoresis
https://www.readbyqxmd.com/read/29123261/a-new-panel-of-pancreatic-cancer-biomarkers-discovered-using-a-mass-spectrometry-based-pipeline
#14
Xiaohui Liu, Weimin Zheng, Wansheng Wang, Huali Shen, Linxiao Liu, Wenhui Lou, Xiaolin Wang, Pengyuan Yang
BACKGROUND: Pancreatic carcinoma (PC) is an aggressive malignancy that lacks strategies for early detection. This study aimed to develop a coherent, high-throughput and non-discriminatory pipeline for the novel clinical biomarker discovery of PC. METHODS: We combined mass spectrometry (MS)-intensive methods such as isobaric tags for relative and absolute quantitation with two-dimensional liquid chromatography-tandem mass spectrometry (iTRAQ-2DLC-MS/MS), 1D-targeted LC-MS/MS, prime MRM (P-MRM) and stable isotope dilution-based MRM (SID-MRM) to analyse serum samples from healthy people (normal control, NC), patients with benign diseases (BD) and PC patients to identify novel biomarkers of PC...
November 9, 2017: British Journal of Cancer
https://www.readbyqxmd.com/read/29121571/high-throughput-%C3%AE-spe-based-elution-coupled-with-uplc-ms-ms-for-determination-of-eluxadoline-in-plasma-sample-application-in-pharmacokinetic-characterization-of-plga-nanoparticle-formulations-in-rats
#15
Muzaffar Iqbal, Essam Ezzeldin, Khalid A Al-Rashood, Ramadan Al-Shdefat, Md Khalid Anwer
Eluxadoline is a novel μ- and κ-opioid receptor (OR) agonist and δ-OR antagonist, recently approved as a first line therapy for the treatment of irritable bowel syndrome. Due to abuse potential, poor bioavailability and high intersubject variability, a sensitive and reliable assay is prerequisite for its determination in biological samples. This work first time report the development and validation of UPLC-MS/MS assay for determination of eluxadoline in rat plasma sample using risperidone as an internal standard (IS)...
October 28, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29121291/pectoral-nerve-block1-versus-modified-pectoral-nerve-block2-for-postoperative-pain-relief-in-patients-undergoing-modified-radical-mastectomy-a-randomized-clinical-trial
#16
S Goswami, P Kundra, J Bhattacharyya
Background: Pectoral nerve block1 (PEC1) given between pectoralis major and minor, and modified pectoral nerve block2 (mPEC2) performed between pectoralis minor and serratus anterior, can provide continuous analgesia after modified radical mastectomy (MRM) when catheters are placed before skin closure. This study was designed to compare PEC1 and mPEC2 block for providing postoperative pain relief after MRM. Methods: Sixty-two physically fit patients undergoing MRM were assigned into two groups (Group PEC1, n=31 and Group mPEC2, n=31)...
October 1, 2017: British Journal of Anaesthesia
https://www.readbyqxmd.com/read/29120359/simultaneous-determination-of-seven-components-in-rat-plasma-by-the-uplc-ms-ms-method-and-application-of-pharmacokinetic-studies-to-simiaoyong-an-decoction
#17
Yuanyan Liu, Sensen Chi, Weihua Wang, Lei Su, Bin Liu
SimiaoYong'an Decoction (SYD) is a classical traditional Chinese prescription that is used for the treatment of gangrene, heat-clearing, detoxification and pain alleviation. We developed a sensitive ultra-performance liquid chromatography-tandem mass spectrum (UPLC-MS/MS) method for the simultaneous determination of seven major active ingredients of SYD extract (i.e., harpagide, chlorogenic acid, sweroside, loganin, liquiritin, angoroside C and harpagoside) in rat plasma. The preliminary steps in the plasma analysis were the addition of an internal standard such as linarin, followed by protein precipitation with methanol...
November 9, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29109100/high-resolution-proteomic-analysis-of-the-cervical-cancer-cell-lines-secretome-documents-deregulation-of-multiple-proteases
#18
REVIEW
Kalliopi I Pappa, Georgia Kontostathi, Manousos Makridakis, Vasiliki Lygirou, Jerome Zoidakis, George Daskalakis, Nicholas P Anagnou
BACKGROUND: Oncogenic infection by HPV, eventually leads to cervical carcinogenesis, associated by deregulation of specific pathways and protein expression at the intracellular and secretome level. Thus, secretome analysis can elucidate the biological mechanisms contributing to cervical cancer. In the present study we systematically analyzed its constitution in four cervical cell lines employing a highly sensitive proteomic technology coupled with bioinformatics analysis. MATERIALS AND METHODS: LC/MS-MS proteomics and bioinformatics analysis were performed in the secretome of four informative cervical cell lines SiHa (HPV16(+)), HeLa (HPV18(+)), C33A (HPV(-)) and HCK1T (normal)...
November 2017: Cancer Genomics & Proteomics
https://www.readbyqxmd.com/read/29102244/an-uhplc-ms-ms-method-for-simultaneous-quantification-of-human-amyloid-beta-peptides-a%C3%AE-1-38-a%C3%AE-1-40-and-a%C3%AE-1-42-in-cerebrospinal-fluid-using-micro-elution-solid-phase-extraction
#19
Ping-Ping Lin, Wei-Li Chen, Fei Yuan, Lei Sheng, Yu-Jia Wu, Wei-Wei Zhang, Guo-Qing Li, Hong-Rong Xu, Xue-Ning Li
Amyloid beta (Aβ) peptides in cerebrospinal fluid are extensively estimated for identification of Alzheimer's disease (AD) as diagnostic biomarkers. Unfortunately, their pervasive application is hampered by interference from Aβ propensity of self-aggregation, nonspecifically bind to surfaces and matrix proteins, and by lack of quantitive standardization. Here we report on an alternative Ultra-high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) method for simultaneous measurement of human amyloid beta peptides Aβ1-38, Aβ1-40 and Aβ1-42 in cerebrospinal fluid (CSF) using micro-elution solid phase extraction (SPE)...
October 23, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29100757/an-uplc-ms-ms-method-for-quantifying-tetrandrine-and-its-metabolite-berbamine-in-human-blood-application-to-a-human-pharmacokinetic-study
#20
Guangyi Yang, Chenning Zhang, Pei Hu, Meiling Zhu, Ming Hu, Song Gao
Tetrandrine (TET) was approved by the China Food and Drug Administration (CFDA) for the treatment of silicosis. However, patients can't use this effective drug chronically due to side effects such as hypersomnia, asthenia, etc. The purpose of this study is to develop an UPLC-MS/MS method to quantify TET and its major metabolite and apply the method in a single dose human pharmacokinetic study. A Restek UItra BiPh column (100×2.1mm, 5μm) was used with acetonitrile and 0.1% formic acid in water as the mobile phases...
October 26, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
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