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https://www.readbyqxmd.com/read/29352525/an-mrm-based-cytokeratin-marker-assay-as-a-tool-for-cancer-studies-application-to-lung-cancer-pleural-effusions
#1
Anna Perzanowska, Agnieszka Fatalska, Grzegorz Wojtas, Andrzej Lewandowicz, Agata Michalak, Grzegorz Krasowski, Christoph H Borchers, Michal Dadlez, Dominik Domanski
PURPOSE: The goal of this work was to develop an LC-MRM assay for the quantitative analysis of a set of established and diagnostically important cytokeratin (CK) markers used in cancer diagnosis, prognosis and therapy monitoring. Secondly, the potential of this assay in lung cancer diagnosis through pleural effusion (PE) analysis was examined. EXPERIMENTAL DESIGN: A multiplexed MRM assay was developed for 17 CKs and their select caspase-cleaved fragments. Isotope-labeled standard peptides were used for high assay specificity and absolute peptide quantitation; with robust standard-flow LC coupled to a latest-generation triple-quadrupole instrument for high sensitivity...
January 19, 2018: Proteomics. Clinical Applications
https://www.readbyqxmd.com/read/29351798/comparative-salivary-proteomics-analysis-of-children-with-and-without-dental-caries-using-the-itraq-mrm-approach
#2
Kun Wang, Yufei Wang, Xiuqing Wang, Qian Ren, Sili Han, Longjiang Ding, Zhongcheng Li, Xuedong Zhou, Wei Li, Linglin Zhang
BACKGROUND: Dental caries is a major worldwide oral disease afflicting a large proportion of children. As an important host factor of caries susceptibility, saliva plays a significant role in the occurrence and development of caries. The aim of the present study was to characterize the healthy and cariogenic salivary proteome and determine the changes in salivary protein expression of children with varying degrees of active caries, also to establish salivary proteome profiles with a potential therapeutic use against dental caries...
January 19, 2018: Journal of Translational Medicine
https://www.readbyqxmd.com/read/29350471/variability-assessment-of-90-salivary-proteins-in-intra-day-and-inter-day-samples-from-healthy-donors-by-multiple-reaction-monitoring-mass-spectrometry
#3
Yung-Chin Hsiao, Lichieh Julie Chu, Yi-Ting Chen, Lang-Ming Chi, Kun-Yi Chien, Wei-Fan Chiang, Ya-Ting Chang, Szu-Fan Chen, Wei-Shun Wang, Yao-Ning Chuang, Shih-Yu Lin, Chih-Yen Chien, Kai-Ping Chang, Yu-Sun Chang, Jau-Song Yu
PURPOSE: Saliva is an attractive sample source for the biomarker-based testing of several diseases, especially oral cancer. Here, we sought to apply multiplexed LC-MRM-MS to precisely quantify 90 disease-related proteins and assess their intra- and inter-individual variability in saliva samples from healthy donors. EXPERIMENTAL DESIGN: We developed two multiplexed LC-MRM-MS assays for 122 surrogate peptides representing a set of disease-related proteins. Saliva samples were collected from 10 healthy volunteers at three different time points (Day 1 morning and afternoon, and Day 2 morning)...
January 19, 2018: Proteomics. Clinical Applications
https://www.readbyqxmd.com/read/29350257/a-new-approach-for-the-extraction-of-tetracyclines-from-soil-matrices-application-of-the-microwave-extraction-technique
#4
Paulina Łukaszewicz, Anna Białk-Bielińska, Joanna Dołżonek, Jolanta Kumirska, Magda Caban, Piotr Stepnowski
The widespread use of tetracyclines (TCs) in animal husbandry is associated with their constant penetration into the environment and the threat they might pose to living organisms. While the literature data on the analysis of these substances in such matrices as food, tissues, or wastewater are quite extensive, there are still only a few methods presented for the determination of these compounds in soil samples. Moreover, among the literature methods for the extraction of TCs from soil samples, microwave-assisted solvent extraction (MAE) was used only once and in combination with liquid chromatography with spectrophotometric detection (LC-UV)...
January 19, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29349861/validated-uplc-ms-ms-method-for-quantification-of-seven-compounds-in-rat-plasma-and-tissues-application-to-pharmacokinetic-and-tissue-distribution-studies-in-rats-after-oral-administration-of-extract-of-eclipta-prostrata-l
#5
Guangyan Du, Lingling Fu, Jun Jia, Xu Pang, Haiyang Yu, Youcai Zhang, Guanwei Fan, Xiumei Gao, Lifeng Han
A rapid, sensitive and specific ultra high performance liquid chromatography coupled with tandem mass spectrometry (UPLC-MS/MS) method was developed to investigate the pharmacokinetics and tissue distribution of Eclipta prostrata extract. Rats were orally administrated the 70% ethanol extract of E. prostrata, and their plasma as well as various organs were collected. The concentrations of seven main compounds, including ecliptasaponin IV, ecliptasaponin A, apigenin, 3'-hydroxybiochanin A, luteolin, luteolin-7-O-glucoside, and wedelolactone, were quantified by UPLC-MS/MS through multiple reactions monitoring (MRM) method...
January 19, 2018: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29334125/determination-of-isoorientin-levels-in-rat-plasma-after-oral-administration-of-vaccinum-bracteatum-thunb-methanol-extract-by-high-performance-liquid-chromatography-tandem-mass-spectrometry
#6
Min-Ji Kim, Seung-Hwan Kwon, Choon-Gon Jang, Han-Joo Maeng
A simple, sensitive and rapid liquid chromatography tandem mass spectrometry method (LC-MS/MS) was developed and validated for the determination of plasma isoorientin levels in rats. After simple protein precipitation using methanol, chromatographic analysis was performed using a Synergi 4μ polar-RP 80A column (150 mm × 2.0 mm, 4 μm) under isocratic conditions and a mobile phase consisting of 0.1% formic acid in water and methanol (80:20, v/v) at a flow rate of 0.2 mL/min. In positive electrospray ionization mode, the protonated precursor and product ion transitions of isoorientin (m/z 449...
January 15, 2018: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29331795/development-and-validation-of-an-uhplc-ms-ms-approach-for-simultaneous-quantification-of-five-bioactive-saponins-in-rat-plasma-application-to-a-comparative-pharmacokinetic-study-of-aqueous-extracts-of-raw-and-salt-processed-achyranthes-bidentata
#7
Yi Tao, Yingshan Du, Weidong Li, Baochang Cai
A simple, accurate and sensitive ultra high-performance liquid chromatography-tandem mass spectrometry approach was established for the simultaneous determination of β-ecdysterone, 25S-inokosterone, ginsenoside Ro, chikusetsusaponin IV and chikusetsusaponin IVa in rat plasma after oral administration of raw and salt-processed Achyranthes bidentata extract. The saponins were completely separated on a Waters BEH C18 UHPLC column by using acetonitrile/0.1% formic acid-water as mobile phases. The mass analysis was performed in a triple quadrupole mass spectrometer using multiple reaction monitoring (MRM) with negative scan mode...
January 9, 2018: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29329091/determination-of-imm-h004-and-its-active-glucuronide-metabolite-in-rat-plasma-and-ringer-s-solution-by-ultra-performance-liquid-chromatography-tandem-mass-spectrometry
#8
Jianwei Jiang, Ziqian Zhang, Xiaowen Zou, Rui Wang, Jie Bai, Shengyu Zhao, Xiaoqing Fan, Li Sheng, Yan Li
IMM-H004 is a novel neuroprotective agent and its glucuronide metabolite IMM-H004G has similar protective effects against cerebral ischemic injury in vivo and in vitro. A specific and sensitive ultra-performance liquid chromatography-tandem mass spectrometry method was established and validated for determination of IMM-H004 and IMM-H004G simultaneously in rat plasma and Ringer's solution. Plasma samples containing IMM-H004, IMM-H004G and internal standard propranolol were prepared by direct protein precipitation in a sample-to-solvent ratio of 1:2:6 (plasma: water: acetonitrile), whereas no protein precipitation was required for Ringer's solution samples...
December 29, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29328967/mycotoxin-production-of-alternaria-strains-isolated-from-korean-barley-grains-determined-by-lc-ms-ms
#9
Thuong T T Nguyen, Jueun Kim, Sun Jeong Jeon, Chul Won Lee, Naresh Magan, Hyang Burm Lee
Twenty-four Alternaria strains were isolated from barley grain samples. These strains were screened for the production of mycotoxins on rice medium using thin layer chromatography. All 24 strains produced at least one of the five mycotoxins (ALT, AOH, ATX-I, AME, and TeA). Three representative strains, namely EML-BLDF1-4, EML-BLDF1-14, and EML-BLDF1-18, were further analyzed using a new LC-MS/MS-based mycotoxin quantification method. This method was used to detect and quantify Alternaria mycotoxins. We used positive ion electrospray mass spectrometry with multiple reaction mode (MRM) for the simultaneous quantification of various Alternaria mycotoxins produced by these strains...
January 3, 2018: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/29328498/an-uplc-ms-ms-method-for-simultaneous-determination-of-five-flavonoids-from-stellerachamaejasme-l-in-rat-plasma-and-its-application-to-a-pharmacokinetic-study
#10
Yun-Qing Li, Cheng-Jian Li, Lei Lv, Qing-Qing Cao, Xian Qian, Si Wei Li, Hui Wang, Liang Zhao
Stellerachamaejasme L. has been used as a Traditional Chinese Medicine for the treatment of scabies, tinea, stubborn skin ulcers, chronic tracheitis, cancer and tuberculosis. A sensitive and selective ultra-high liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) method was developed and validated for the simultaneous determination of five flavonoids (stelleranol, chamaechromone, neochamaejasmin A, chamaejasmine and isochamaejasmin) of Stellerachamaejasme L. in rat plasma. Chromatographic separation was accomplished on an Agilent Poroshell 120 EC-C18 column (2...
January 12, 2018: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29322563/microfluidics-based-lc-ms-mrm-approach-for-the-relative-quantification-of-burkholderia-cenocepacia-secreted-virulence-factors
#11
Sofie Depluverez, Simon Daled, Stijn De Waele, Sören Planckaert, Jolien Schoovaerts, Dieter Deforce, Bart Devreese
Burkholderia cenocepacia is an opportunistic pathogen that is commonly isolated from patients with cystic fibrosis (CF). Several virulence factors have been identified, including extracellular enzymes that are secreted by type II and type VI secretion systems. The activity of these secretion systems is modulated by quorum sensing. Apart from the classical acylhomoserine lactone quorum sensing, B. cenocepacia also uses the diffusible signal factor system (DSF) i.e. 2-undecenoic acid derivatives that are recognized by specific receptors resulting in changes in biofilm formation, motility and virulence...
January 11, 2018: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/29315974/microdialysis-sampling-combined-with-ultra-high-performance-liquid-chromatography-tandem-mass-spectrometry-for-the-determination-of-geniposide-in-dialysate-of-joint-cavities-in-adjuvant-arthritis-rats
#12
Wen-Yu Wang, Wei Wang, Hong Wu, Shu-Ping Li, Rong Wang, Li Dai, Zheng-Rong Zhang, Jun Fu, Ran Deng, Feng Li
RATIONALE: Microdialysis has been used to detect the concentrations of drugs in tissues. Geniposide (GE), an iridoid glycoside compound, is the main bioactive component of Gardenia jasminoides Ellis fruit. We previously demonstrated that GE could control the activity of cytokines and reduce levels of inflammation in adjuvant arthritis (AA) rats, but the topic of concentration changes over time in the joint synovia of AA is scarcely studied. METHODS: In this study, microdialysis technique combined with ultra-high-performance liquid chromatography-electrospray ionization coupled with tandem mass spectrometry (UHPLC-ESI-MS/MS) was set up and confirmed to assay GE in the dialysate of the joint cavity in AA rats...
January 5, 2018: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/29315954/development-and-validation-of-an-assay-to-analyze-atazanavir-in-human-hair-via-liquid-chromatography-tandem-mass-spectrometry-lc-ms-ms
#13
Nhi Phung, Karen Kuncze, Hideaki Okochi, Alexander Louie, Leslie Z Benet, Igho Ofokotun, David W Haas, Judith S Currier, Tariro D Chawana, Anandi N Sheth, Peter Bacchetti, Monica Gandhi, Howard Horng
Assays to quantify antiretrovirals in hair samples are increasingly used to monitor adherence and exposure in both HIV prevention and treatment studies. Atazanavir (ATV) is a protease inhibitor used in combination antiretroviral therapy (ART). We developed and validated a liquid chromatography tandem mass spectrometry (LC-MS/MS)-based method to quantify ATV in human hair, per the NIH Division of AIDS' Clinical Pharmacology Quality Assurance (CPQA) program and the FDA bioanalytical method validation guidelines...
January 9, 2018: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/29315691/validation-of-a-chiral-lc-ms-ms-esi-method-for-the-simultaneous-quantification-of-darolutamide-diastereomers-in-mice-plasma-and-its-application-to-a-stereoselective-pharmacokinetic-study-in-mice
#14
Narayan Balaji, Suresh P Sulochana, Neeraj Kumar Saini, A Siva Kumar, Ramesh Mullangi
A simple, selective and reliable LC-MS/MS method was validated for simultaneous quantitation of darolutamide diastereomers in 50 μL mice plasma using warfarin as an internal standard (IS) as per regulatory guidelines. Plasma samples were extracted by liquid-liquid extraction and the chromatographic separation was achieved on a Chiralpak IA column with an isocratic mobile phase 5 mM ammonium acetate:absolute alcohol (20:80, v/v) at a flow rate of 1.0 mL/min. Detection and quantitation was done by MRM mode following the transitions: m/z 397 → 202 and 307 → 250 for darolutamide diastereomers and the IS, respectively in the negative ionization mode...
January 8, 2018: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29314157/determination-of-cycloserine-in-microdialysis-samples-using-liquid-chromatography-tandem-mass-spectrometry-with-benzoyl-chloride-derivatization
#15
Wenjing Zhang, Sihui Wan, Lizhi Chen, Xuebing Wang, Zhuo Wang, Yi Huang
A new method for the analysis of cycloserine (4-amino-3-isoxazolidinone, CYC) in rat microdialysis samples has been developed. This method consists of derivatizing the CYC with benzoyl chloride, which transforms primary amines into highly stable derivatives. An attractive feature of this method was that the derivatization reaction is straightforward and can be completed within 10 min. The formed derivative, in contrast to the non-derivatized analyte, exhibited increased chromatographic retention and decreased matrix effects resulting from the co-elution of other components using reversed-phase liquid chromatography and on-line switching...
January 4, 2018: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29314090/development-and-validation-of-lc-ms-ms-method-for-simultaneous-determination-of-sofosbuvir-and-daclatasvir-in-human-plasma-application-to-pharmacokinetic-study
#16
Ola M Abdallah, Ahmed M Abdel-Megied, Amira S Gouda
The first simple and highly sensitive Liquid chromatography-tandem mass spectrometry (LC-MS/MS) bioanalytical method was developed and fully validated for the simultaneous determination of newly discovered antiviral drugs namely, Sofosbuvir (SOF) and Daclatasvir (DAC) in human plasma. Tadalafil (TAD) was used as internal standard (IS). SOF, DAC and TAD (IS) were extracted from plasma using liquid-liquid extraction technique with methyl tert-butyl ether. The chromatographic separation was carried out using ZorbaxSB-C18 column (4...
January 3, 2018: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29310052/simultaneous-determination-of-tpn729-and-its-five-metabolites-in-human-plasma-and-urine-by-liquid-chromatography-coupled-to-tandem-mass-spectrometry
#17
Yang Liu, Shuguang Shao, Hanlin Song, Xueting Yao, Jie Liu, Hongzhong Liu, Ling Song, Ji Jiang, Dongyang Liu, Pei Hu
A specific and sensitive method was firstly developed using high performance liquid chromatography coupled with tandem mass spectrometry (HPLC-MS/MS) to simultaneously quantify TPN729 and its metabolites (TPN729-D1, TPN729-D2, TPN729M15-3 and TPN729M3) in human plasma and (TPN729-D1, TPN729-D2, TPN729M15-3 and TPN729M14) in human urine. Protein precipitation and direct dilution were used to extract TPN729 and its metabolites from plasma and urine, respectively. Ionization of TPN729, TPN729-D1, TPN729-D2, TPN729M15-3, TPN729M3, TPN729M14 and sildenafil (internal standard, IS) was performed using an electrospray ionization (ESI) source in positive mode and detection was carried out with multiple reaction monitoring (MRM) mode...
December 30, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29304410/simultaneous-quantitative-determination-of-bioactive-terpene-indole-alkaloids-in-ethanolic-extracts-of-catharanthus-roseus-l-g-don-by-ultra-high-performance-liquid-chromatography-tandem-mass-spectrometry
#18
Sunil Kumar, Awantika Singh, Brijesh Kumar, Bikarma Singh, Lal Bahadur, Mohan Lal
A rapid, sensitive and reproducible method using ultra-high-performance liquid chromatography coupled with electrospray ionization hybrid triple quadrupole-linear ion trap mass spectrometry (UHPLC-ESI-QqQLIT-MS/MS) in multiple reaction monitoring (MRM) mode was developed and validated for simultaneous quantitation of anticancer (vincristine, vinblastine, vindesine), antihypertensive (ajmaline, ajmalicine, reserpine), aphrodisiac (yohimbine), sedative (serpentine) agents, dietary supplement (vinpocetine, yohimbine) and precursor of vinblastine (vindoline) from crude extracts of Catharanthus roseus...
December 25, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29300153/bifidobacterium-catulorum-sp-nov-a-novel-taxon-from-the-faeces-of-the-baby-common-marmoset-callithrix-jacchus
#19
Monica Modesto, Samanta Michelini, Kaihei Oki, Bruno Biavati, Koichi Watanabe, Paola Mattarelli
In our previous study based on hsp60 PCR-restriction fragment length polymorphism and 16S rRNA gene sequencing, we stated that the bifidobacterial strains isolated from the individual faecal samples of five baby common marmosets constituted different phylogenetically isolated groups of the genus Bifidobacterium. In that study, we also proposed that these isolated groups potentially represented novel species of the genus Bifidobacterium. Out of them, Bifidobacterium aesculapii, Bifidobacterium myosotis, Bifidobacterium tissieri and Bifidobacterium hapali, have been described recently...
January 4, 2018: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/29296750/multiplexed-targeted-proteomic-assay-to-assess-coagulation-factor-concentrations-and-thrombosis-associated-cancer
#20
Yassene Mohammed, Bart J van Vlijmen, Juncong Yang, Andrew J Percy, Magnus Palmblad, Christoph H Borchers, Frits R Rosendaal
The plasma levels of pro- and anticoagulant proteins are important markers for venous thrombosis (VT) risk and can be affected by both genetic and acquired factors, including cancer. Generally, these markers are measured using activity- or antibody-based assays. Targeted proteomics with stable-isotope-labeled internal standards has proven adept at the rapid, multiplex, and precise quantification of proteins in complex biological samples such as plasma. We used liquid chromatography coupled to multiple reaction monitoring (MRM) mass spectrometry to evaluate the concentrations of 31 coagulation- and fibrinolysis-related proteins in plasma from 25 healthy controls, 25 patients with VT, and 25 patients with VT who were also diagnosed with cancer...
June 27, 2017: Blood Advances
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