keyword
MENU ▼
Read by QxMD icon Read
search

Mrm

keyword
https://www.readbyqxmd.com/read/28427148/in-depth-proteomic-profiling-of-left-ventricular-tissues-in-human-end-stage-dilated-cardiomyopathy
#1
Shanshan Liu, Yan Xia, Xiaohui Liu, Yi Wang, Zhangwei Chen, Juanjuan Xie, Juying Qian, Huali Shen, Pengyuan Yang
Dilated cardiomyopathy (DCM) is caused by reduced left ventricular (LV) myocardial function, which is one of the most common causes of heart failure (HF). We performed iTRAQ-coupled 2D-LC-MS/MS to profile the cardiac proteome of LV tissues from healthy controls and patients with end-stage DCM. We identified 4263 proteins, of which 125 were differentially expressed in DCM tissues compared to LV controls. The majority of these were membrane proteins related to cellular junctions and neuronal metabolism. In addition, these proteins were involved in membrane organization, mitochondrial organization, translation, protein transport, and cell death process...
February 25, 2017: Oncotarget
https://www.readbyqxmd.com/read/28423018/comprehensive-analysis-of-phospholipids-and-glycolipids-in-the-opportunistic-pathogen-enterococcus-faecalis
#2
Rafi Rashid, Amaury Cazenave-Gassiot, Iris H Gao, Zeus J Nair, Jaspal K Kumar, Liang Gao, Kimberly A Kline, Markus R Wenk
Enterococcus faecalis is a Gram-positive, opportunistic, pathogenic bacterium that causes a significant number of antibiotic-resistant infections in hospitalized patients. The development of antibiotic resistance in hospital-associated pathogens is a formidable public health threat. In E. faecalis and other Gram-positive pathogens, correlations exist between lipid composition and antibiotic resistance. Resistance to the last-resort antibiotic daptomycin is accompanied by a decrease in phosphatidylglycerol (PG) levels, whereas multiple peptide resistance factor (MprF) converts anionic PG into cationic lysyl-PG via a trans-esterification reaction, providing resistance to cationic antimicrobial peptides...
2017: PloS One
https://www.readbyqxmd.com/read/28420860/comparison-of-the-docetaxel-concentration-in-human-plasma-measured-with-liquid-chromatography-tandem-mass-spectrometry-lc-ms-ms-and-a-nanoparticle-immunoassay-and-clinical-applications-of-that-assay
#3
Chunmei Geng, Pingli Li, Xuwang Chen, Guiyan Yuan, Nan Guo, Huanjun Liu, Rui Zhang, Ruichen Guo
To determine the feasibility of using a nanoparticle immunoassay for clinical therapeutic drug monitoring (TDM) of docetaxel concentrations, a sensitive and simple method of liquid chromatography-tandem mass spectrometry (LC-MS/MS) was established to measure the docetaxel concentration in human plasma and the results of LC-MS/MS and the immunoassay were compared. Docetaxel and paclitaxel (the internal standard, or IS) in human plasma were extracted through protein precipitation, separated on a Diamonsil C18 column (150 mm × 4...
April 17, 2017: Bioscience Trends
https://www.readbyqxmd.com/read/28419438/dinosaur-tail-sign-a-useful-spinal-mri-finding-indicative-of-cerebrospinal-fluid-leakage
#4
Keita Sakurai, Masafumi Kanoto, Motoo Nakagawa, Masashi Shimohira, Aya M Tokumaru, Masashi Kameyama, Keigo Shimoji, Satoru Morimoto, Noriyuki Matsukawa, Minoru Nishio, Yuta Shibamoto
OBJECTIVE: To evaluate the imaging characteristics and diagnostic utility of the "Dinosaur tail sign" in the diagnosis of cerebrospinal fluid (CSF) leakage. BACKGROUND: The authors propose the "Dinosaur tail sign," defined as a combination of the dorsal epidural hyperintensities, fat tissue, spinal cord, and cauda equine on lumbosacral sagittal fat-suppressed T2-weighted image (FST2WI), as a sensitive indicator for diagnosing CSF leakage. METHODS: Imaging characteristics of the "Dinosaur tail sign" was evaluated in seven spontaneous intracranial hypotension (SIH) and 23 iatrogenic CSF leakage (ICSFL) patients...
April 16, 2017: Headache
https://www.readbyqxmd.com/read/28418637/development-and-application-of-an-msall-based-approach-for-the-quantitative-analysis-of-linear-polyethylene-glycols-in-rat-plasma-by-liquid-chromatography-triple-quadrupole-time-of-flight-mass-spectrometry
#5
Xiaotong Zhou, Xiangjun Meng, Longmei Cheng, Chong Su, Yantong Sun, Lingxia Sun, Zhaohui Tang, John Paul Fawcett, Yan Yang, Jingkai Gu
Polyethylene glycols (PEGs) are synthetic polymers composed of repeating ethylene oxide subunits. They display excellent biocompatibility and are widely used as pharmaceutical excipients. To fully understand the biological fate of PEGs requires accurate and sensitive analytical methods for their quantitation. Application of conventional liquid chromatography-tandem mass spectrometry (LC-MS/MS) is difficult because PEGs have polydisperse molecular weights (MWs) and tend to produce multicharged ions in-source resulting in innumerable precursor ions...
April 18, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28415014/determination-and-quantification-of-intracellular-fludarabine-triphosphate-cladribine-triphosphate-and-clofarabine-triphosphate-by-lc-ms-ms-in-human-cancer-cells
#6
Jean-Yves Puy, Lars Petter Jordheim, Emeline Cros-Perrial, Charles Dumontet, Suzanne Peyrottes, Isabelle Lefebvre-Tournier
Purine nucleoside analogues are widely used in the treatment of haematological malignancies, and their biological activity is dependent on the intracellular accumulation of their triphosphorylated metabolites. In this context, we developed and validated a liquid chromatography tandem mass spectrometry (LC-MS/MS) method to study the formation of 5'-triphosphorylated derivatives of cladribine, fludarabine, clofarabine and 2'-deoxyadenosine in human cancer cells. Br-ATP was used as internal standard. Separation was achieved on a hypercarb column...
March 24, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28414972/an-lc-ms-ms-method-for-quantification-of-ac0010-a-novel-mutant-selective-epidermal-growth-factor-receptor-egfr-inhibitor-and-its-metabolites-in-human-plasma-and-the-application-to-a-pharmacokinetic-study
#7
Lu Wang, Xin Zheng, Weicong Wang, Pei Hu, Ji Jiang
AC0010 is an irreversible, mutant-selective EGFR inhibitor that effectively inhibits EGFR active and T790M resistance mutations in non-small cell lung cancer (NSCLC). A sensitive ultra-performance liquid chromatography - tandem mass spectrometry (UPLC-MS/MS) method was developed and fully validated for determining AC0010 and its metabolites in human plasma. The samples were purified by solid-phase extraction (SPE) columns and separated on a BEH C18 column. Electrospray ionization (ESI) in positive ion mode and multiple reaction monitoring (MRM) were used to monitor the ion transitions of AC0010 (m/z 488→257) and its metabolites M1 (m/z 474→403), M2 (m/z 504→487), M4 (m/z 434→377), M7 (m/z 490→405), MII-1 (m/z 651→434) and MII-2 (m/z 609→434)...
March 28, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28409868/validated-uhplc-ms-ms-assay-for-quantitative-determination-of-etoposide-gemcitabine-vinorelbine-and-their-metabolites-in-lung-cancer-patients
#8
Xiaobin Gong, Le Yang, Feng Zhang, Youtian Liang, Shouhong Gao, Ke Liu, Wansheng Chen
A fully valid ultra-high performance liquid chromatography coupled with mass spectrometry (UHPLC- MS/MS) method was developed for the determination of etoposide, gemcitabine, vinorelbine and their metabolites (etoposide catechol, 2',2'-difluorodeoxyuridine and 4-O-deacetylvinorelbine) in human plasma. Multiple reaction monitoring (MRM) mode was performed with an electrospray ionization (ESI) interface operating in both the positive and negative ion modes per compound. The method required only 100 μL plasma with a one-step simple de-proteinization procedure, and a short run time of 7...
April 13, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28408426/staffas-a-burgos-da-silva-m-van-den-brink-mrm-the-intestinal-microbiota-in-allogeneic-hematopoietic-cell-transplant-and-graft-versus-host-disease-blood-2017-129-8-927-933
#9
https://www.readbyqxmd.com/read/28407889/reductive-amination-derivatization-for-the-quantification-of-garlic-components-by-isotope-dilution-analysis
#10
Yi-Reng Lin, Mei-Fang Huang, You-Ying Wu, Meng-Chieh Liu, Jing-Heng Huang, Ziyu Chen, Yow-Ling Shiue, Chia-En Wu, Shih-Shin Liang
In this work, we synthesized internal standards for four garlic organosulfur compounds (OSCs) by reductive amination with (13)C, D2-formaldehyde, and developed an isotope dilution analysis method to quantitate these organosulfur components in garlic samples. Internal standards were synthesized for internal absolute quantification of S-allylcysteine (SAC), S-allylcysteine sulfoxide (alliin), S-methylcysteine (SMC), and S-ethylcysteine (SEC). We used a multiple reaction monitoring (MRM) to detect (13)C, D2-formaldehyde-modified OSCs by ultrahigh-performance liquid phase chromatography coupled with tandem mass spectrometry (UHPLC-MS/MS) and obtained MS spectra showing different ratios of (13)C, D2-formaldehyde-modified and H2-formaldehyde-modified compounds...
September 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28406923/model-selection-with-multiple-regression-on-distance-matrices-leads-to-incorrect-inferences
#11
Ryan P Franckowiak, Michael Panasci, Karl J Jarvis, Ian S Acuña-Rodriguez, Erin L Landguth, Marie-Josée Fortin, Helene H Wagner
In landscape genetics, model selection procedures based on Information Theoretic and Bayesian principles have been used with multiple regression on distance matrices (MRM) to test the relationship between multiple vectors of pairwise genetic, geographic, and environmental distance. Using Monte Carlo simulations, we examined the ability of model selection criteria based on Akaike's information criterion (AIC), its small-sample correction (AICc), and the Bayesian information criterion (BIC) to reliably rank candidate models when applied with MRM while varying the sample size...
2017: PloS One
https://www.readbyqxmd.com/read/28403574/determination-of-artemisitene-in-rat-plasma-by-uplc-ms-ms-and-its-application-in-pharmacokinetics
#12
Lilan Wu, Yunshan Wu, Weiying Chen, Wen Zhou, Lipeng Tang, Ben Li, Bo Liu
RATIONALE: Artemisitene showed a wide variety of pharmacological activities, such as antioxidant protection in vitro and in vivo. It has been identified as a novel Nrf2 inducer. However, there is no report on an UPLC-MS/MS method to quantitate artemisitene in rat plasma and its application on pharmacokinetic profile study. METHODS: An ACQUITY UPLC(TM) BEH Symmetry ShieldRP18 column (1.7 µm, 2.1 mm × 100 mm) was used with a flow rate of 0.3 mL · min(-1) ...
April 12, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28403069/using-a-pedicle-pectoralis-major-musculocutaneous-flap-in-head-and-neck-reconstruction-after-modified-radical-mastectomy-a-case-report
#13
Jen-Wu Huang, Nai-Yuan Wu, Yi-Ying Lin
RATIONALE: A pedicle pectoralis major musculocutaneous (PMMC) flap is one of the strategies for head and neck reconstruction. Seldom studies reported the case in which the skin area of previous modified radical mastectomy (MRM) had been used as a PMMC flap in head and neck reconstruction. PATIENT CONCERNS: An 84-year-old female who had suffered from left breast cancer and undergone a left modified radical mastectomy (MRM) more than 20 years earlier. DIAGNOSES: She had squamous cell carcinoma of the tongue and had undergone partial glossection and left modified radial neck dissection...
April 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28393405/determination-of-irinotecan-sn-38-and-sn-38-glucuronide-using-hplc-ms-ms-application-in-a-clinical-pharmacokinetic-and-personalized-medicine-in-colorectal-cancer-patients
#14
Chalirmporn Atasilp, Pichai Chansriwong, Ekapob Sirachainan, Thanyanan Reungwetwattana, Apichaya Puangpetch, Santirhat Prommas, Suwannee Sirilerttrakul, Budsaba Rerkarmnuaychoke, Sansanee Wongwaisayawan, Chonlaphat Sukasem
BACKGROUND: Irinotecan (CPT-11) is chemotherapy used mainly in the metastatic colorectal cancer. The purpose of this study was to develop and validate the LC-MS/MS for the simultaneous determination of CPT-11, SN-38, and SN-38G. METHODS: A 100 μL of plasma was prepared after protein precipitation and analyzed on a C18 column using 0.1% acetic acid in water and 0.1% acetic acid in acetonitrile as mobile phases. The mass spectrometer worked with multiple reaction monitoring (MRM) in positive scan mode...
April 10, 2017: Journal of Clinical Laboratory Analysis
https://www.readbyqxmd.com/read/28390484/profiling-of-carbonyl-compounds-in-serum-by-stable-isotope-labeling-double-precursor-ion-scan-mass-spectrometry-analysis
#15
Ning Guo, Chun-Yan Peng, Quan-Fei Zhu, Bi-Feng Yuan, Yu-Qi Feng
Carbonyl compounds are considered as the potential biomarkers for oxidative stress and many types of diseases; therefore their determination may serve as indicator for early clinical diagnosis. Here we developed a strategy based on isotope labeling combined with liquid chromatography-double precursor ion scan-mass spectrometry (IL-LC-DPIS-MS) analysis for comprehensive profiling and relative quantitation of carbonyl compounds in human serum. First, we chose labeling reagents (2-(2-hydrazinyl-2-oxoethyl)isoquinolin-2-ium bromide, HIQB; N,N,N-triethyl-2-hydrazinyl-2-oxoethanaminium bromide, THB; Girard reagent T, GT; Girard reagent P, GP), all of which contain reactive group, isotopically labeled moiety and ionizable group to selectively label carbonyl compounds...
May 15, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28384605/simultaneous-quantification-of-11-active-constituents-in-shexiang-baoxin-pill-by-ultraperformance-convergence-chromatography-combined-with-tandem-mass-spectrometry
#16
Chao Lv, Liqing Chen, Peng Fu, Niao Yang, Qun Liu, Yongwei Xu, Qinglong Sun, Rui Li, Changsen Zhan, Weidong Zhang, Runhui Liu
On account of the complexity of chemical constituents of Shexiang Baoxin Pill (SBP), a famous traditional Chinese medicine (TCM) formula, a novel and effective UPC(2)-MS/MS method was developed to simultaneously determine the content of 11 active compounds of SBP with outstanding separation ability. Eleven components in SBP, including 2 ginsenosides, 2 bile acids, 3 bufadienolides and 4 volatiles were detected by electrospray ionization tandem mass spectrometry in positive and negative ion modes with multiple reaction monitor (MRM)...
March 31, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28373472/prognostic-value-of-prepectoral-edema-in-mr-mammography
#17
Clemens G Kaiser, Michael Herold, Julia Krammer, Pascal Baltzer, Mieczyslaw Gajda, Oumar Camara, Stefan Schoenberg, Werner A Kaiser, Matthias Dietzel
BACKGROUND/AIM: Previous studies have indicated a highly significant correlation between invasive tumors and accompanying prepectoral edema (PE) in MR-mammography (MRM). The aim of the present study was to identify prognostic factors associated with PE as a diagnostic sign. MATERIALS AND METHODS: A total of 1,109 consecutive MRM exams were included in this study. Exclusion criteria were previous operation, biopsy, intervention, chemotherapy, hormone replacement therapy (HRT) or previous mastitis...
April 2017: Anticancer Research
https://www.readbyqxmd.com/read/28372838/development-and-validation-of-a-liquid-chromatography-tandem-mass-spectrometry-method-for-the-determination-of-cannabinoids-and-phase-i-and-ii-metabolites-in-meconium
#18
Pablo Prego-Meleiro, Elena Lendoiro, Marta Concheiro, Angelines Cruz, Manuel López-Rivadulla, Ana de Castro
A liquid chromatography-tandem mass spectrometry (LC-MSMS) method was developed and fully validated for the determination of Δ(9)-tetrahydrocannabinol (THC), 11-hydroxyTHC (OHTHC), 11-nor-9-carboxyTHC (THCCOOH), 8-β-11-dihydroxyTHC (diOHTHC), cannabinol, cannabidiol, and THC and THCCOOH glucuronides in 0.25±0.02g meconium. Samples were homogenized in methanol and subjected to cation exchange solid-phase extraction. Chromatographic separation was performed on a Kinetex C18 column (50 mm×2.1mm, 2.6μm) at 35°C, with a gradient of 0...
March 25, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28372256/lc-ms-phenolic-profiling-combined-with-multivariate-analysis-as-an-approach-for-the-characterization-of-extra-virgin-olive-oils-of-four-rare-tunisian-cultivars-during-ripening
#19
Samia Ben Brahim, Hasim Kelebek, Sonda Ammar, Mounir Abichou, Mohamed Bouaziz
In this work, the phenolic composition of four rare cultivars grown under the same agronomical and environmental conditions was studied. This is to test the effects of cultivars and ripening index essentially on phenolic composition in olive oils as well as tocopherols composition, organoleptic profiling and oxidative properties. Furthermore, some agronomical traits were determined in which a general increase in the size of the fruit and oil contents were recorded for all cultivars. The phenolic fractions were identified and quantified using liquid chromatography coupled to diode array detection and electrospray ionization tandem mass spectrometry (LC-DAD-ESI-MS/MS) in multiple reaction monitoring mode (MRM)...
August 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28372185/rapid-assay-of-resveratrol-in-red-wine-by-paper-spray-tandem-mass-spectrometry-and-isotope-dilution
#20
Leonardo Di Donna, Domenico Taverna, Serena Indelicato, Anna Napoli, Giovanni Sindona, Fabio Mazzotti
A rapid analytical approach for the assay of resveratrol in red wines, based on Paper Spray Mass Spectrometry (PS-MS) and Multiple Reaction Monitoring (MRM) is described. The assay involves the use of the stable isotope dilution method. The analytical parameters calculated analyzing fortified samples confirm the reliability of the proposed approach, with accuracy values about 100%, and LOD and LOQ values calculated at 0.5 and 0.8μg/mL, respectively. Furthermore, both the recovery, which was quantitative for the analyte, and the reproducibility (RSD%), checked on different days on the same wine, always below 7%, highlighted the consistency of the methodology...
August 15, 2017: Food Chemistry
keyword
keyword
21211
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"