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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
#1
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/29329092/effect-of-aspirin-on-the-pharmacokinetics-and-absorption-of-panax-notoginseng-saponins
#2
Zhihao Tian, Huanhuan Pang, Qiang Zhang, Shouying Du, Yang Lu, Lin Zhang, Jie Bai, Pengyue Li, Danqi Li, Mengdi Zhao, Xiaonan Chen
BACKGROUND: Panax notoginseng saponins, a traditional Chinese medicine extraction, and aspirin are both widely used to treat cerebral infarction in China. Good results in clinical practice have been achieved, when Panax notoginseng saponins was taken together with aspirin. METHODS: To investigate the interaction of the two drugs in vivo, the concentration of notoginsenoside R1, ginsenoside Rg1, Rb1, Re and Rd. in blood were simultaneously measured by UPLC/MS/MS...
January 2, 2018: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29325818/simultaneous-determination-of-voriconazole-posaconazole-itraconazole-and-hydroxy-itraconazole-in-human-plasma-using-lcms-ms
#3
Nicole Jenkins, Marion Black, Hans G Schneider
INTRODUCTION: Invasive fungal infections are an increasing cause of mortality and morbidity in high risk patient populations such as those on immunosuppressive therapy. Triazole antifungals are recommended for the prevention and treatment of such infections. The aim of this study was to develop and validate a simple, sensitive and robust LCMS/MS method for the simultaneous analysis in human plasma of three frequently used antifungal drugs: voriconazole, posaconazole, and itraconazole...
January 8, 2018: Clinical Biochemistry
https://www.readbyqxmd.com/read/29314156/simultaneous-quantification-of-t4-t3-rt3-3-5-t2-and-3-3-t2-in-larval-zebrafish-danio-rerio-as-a-model-to-study-exposure-to-polychlorinated-biphenyls
#4
Xiaopeng Chen, Kyla M Walter, Galen W Miller, Pamela J Lein, Birgit Puschner
Environmental toxicants that interfere with thyroid hormone (TH) signaling can impact growth and development in animals and humans. Zebrafish represent a model to study chemically-induced TH disruption, prompting the need for sensitive detection of THs. Simultaneous quantification of 3,3',5-triiodo-L-thyronine (T3), thyroxine (T4), 3,3',5'-triiodo-L-thyronine (rT3), 3,5-diiodo-L-thyronine (3,5-T2), and 3,3'-diiodo-L-thyronine (3,3'-T2) in zebrafish larvae was achieved by ultra-performance liquid chromatography-tandem mass spectrometry in positive ion mode...
January 3, 2018: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29314089/a-validated-lc-ms-ms-method-for-the-determination-of-senkyunolide-i-in-dog-plasma-and-its-application-to-a-pharmacokinetic-and-bioavailability-studies
#5
Jin-Qi Li, Jia-Feng Wang, Jie Li, Shu-Han Zhang, Dan He, Rong-Sheng Tong, Shu-Ya She
Senkyunolide I is one of the major bioactive components in herb medicine Ligusticum chuanxiong. The aim of this study was to develop and validate a fast, simple and sensitive LC-MS/MS method for the determination of senkyunolide I in dog plasma. The plasma samples were processed with acetonitrile and separated on a Waters ACQUITY UPLC BEH C18 column (50 × 2.1 mm, 1.7 μm). A mobile phase consisted of 0.1% formic acid aqueous and acetonitrile was delivered at a flow rate of 0.3 mL·min-1 . The detection was achieved in the positive selected reaction monitoring (SRM) mode with precursor-to-product transitions at m/z 225...
January 3, 2018: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29313215/association-of-mitochondrial-dna-content-in-peripheral-blood-with-cancer-related-fatigue-and-chemotherapy-related-cognitive-impairment-in-early-stage-breast-cancer-patients-a-prospective-cohort-study
#6
Jung-Woo Chae, Peh Siang Chua, Terence Ng, Angie Hui Ling Yeo, Maung Shwe, Yan Xiang Gan, Sreemanee Dorajoo, Koon Mian Foo, Kiley Wei-Jen Loh, Si-Lin Koo, Wen Yee Chay, Tira Jing Ying Tan, Sok Yuen Beh, Elaine Hsuen Lim, Guek Eng Lee, Rebecca Dent, Yoon Sim Yap, Raymond Ng, Han Kiat Ho, Alexandre Chan
PURPOSE: Cancer-related fatigue (CRF) and chemotherapy-related cognitive impairment (CRCI) are reported to be associated with mitochondrial dysfunction. Hence, mitochondrial DNA (mtDNA) content, a biomarker of mitochondrial dysfunction, is hypothesized to correlate with the onset of CRF and CRCI. This study aims to evaluate the association between peripheral blood mtDNA content reduction and severity of CRF and CRCI in patients receiving chemotherapy. METHODS: This was a prospective cohort study...
January 8, 2018: Breast Cancer Research and Treatment
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
#7
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/29300835/simultaneous-determination-of-impurities-of-atazanavir-and-ritonavir-in-tablet-dosage-form-by-using-reversed-phase-ultra-performance-liquid-chromatographic-method
#8
Murali Krishna V V N Mantripragada, Sumathi V Rao, Venugopal V S Nutulapati, Bhaskara P V Mantena
A simple, rapid, selective and stability indicating reversed phase-ultra performance liquid chromatography method was developed and validated for the simultaneous quantification of process related and degradation impurities present in Atazanavir and Ritonavir tablets. The two proposed drug components and their respective impurities were separated using Acquity BEH C18 (100 mm × 2.1 mm), 1.7 μ column at a flow rate of 0.4 mL/min. Buffer used as Mobile phase-A which consists of 0.01 M monobasic potassium hydrogen phosphate adjusted the pH to 3...
December 29, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/29294557/-determination-of-phenylglyoxylic-acid-and-mandelic-acid-in-urine-by-high-performance-liquid-chromatography-method
#9
S W Cui, X F Pan, H F Yan
Objective: To revise the standard method for the determination of phenylglyoxylic acid(PGA)and mandelic acid(MA) in urine by ultra-performance liquid chromatography. Methods: The original standard method was evaluated by experiment, and the chromatographic column, the detection limit,quantitation limit and stabilityof the method were studied. Results: The samples were separated by BEH Phenyl(50mm×2.1mm×1.7μm)column and the internal standard working curve method was used. The regression equations were y=3...
October 20, 2017: Chinese Journal of Industrial Hygiene and Occupational Diseases
https://www.readbyqxmd.com/read/29248770/development-and-validation-of-an-uhplc-esi-qtof-ms-method-for-quantification-of-the-highly-hydrophilic-amyloid-%C3%AE-oligomer-eliminating-all-d-enantiomeric-peptide-rd2-in-mouse-plasma
#10
Michelle Hupert, Anne Elfgen, Elena Schartmann, Sarah Schemmert, Brigitte Buscher, Janine Kutzsche, Dieter Willbold, Beatrix Santiago-Schübel
During preclinical drug development, a method for quantification of unlabeled compounds in blood plasma samples from treatment or pharmacokinetic studies in mice is required. In the current work, a rapid, specific, sensitive and validated liquid chromatography mass-spectrometric UHPLC-ESI-QTOF-MS method was developed for the quantification of the therapeutic compound RD2 in mouse plasma. RD2 is an all-D-enantiomeric peptide developed for the treatment of Alzheimer's disease, a progressive neurodegenerative disease finally leading to dementia...
December 8, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29222834/effects-of-a-music-creation-programme-on%C3%A2-the-anxiety-self-esteem-and-quality-of-life-of%C3%A2-people-with-severe-mental-illness-a-quasi-experimental-design
#11
Beh-Huan Chang, Bo-Wei Chen, Jason W Beckstead, Chiu-Yueh Yang
Many studies have shown that music therapy improves patients' symptoms. However, interventions using music creation as their core await further development for patients with severe mental illness (SMI). The current study investigated the effect of a music-creation programme on the anxiety, self-esteem, and quality of life of patients with SMI. A quasi-experimental design using convenience sampling was adopted to recruit patients with SMI from a psychiatric day care centre. Participants were grouped based on their willingness to undergo an intervention (26 patients in the experimental group and 23 patients in the control group)...
December 8, 2017: International Journal of Mental Health Nursing
https://www.readbyqxmd.com/read/29218942/-analysis-of-alcohol-extract-and-water-extract-of-polygonum-capitatum-by-uplc-q-tof-ms
#12
Wen Zhou, Li-Yan Zhang, Li-Min Xie, Li-Fang Qiu, Jing-Rong Wang, Si-Bu Ma, Zhi-Hong Jiang, Jing-Wen Tang
In this study, we used Ultra Performance Liquid Chromatography-Time-of-Flight Mass Spectrometry(UPLC-TOF-MS)to identify the chemical constituents in both ethanol and water extract of Polygonum capitatum. A Waters ACQUITY UPLC BEH C₁₈ column(2.1 mm×100 mm,1.7 μm) was used for separation. The mobile phase was consisted of(A) 0.10% formic acid in water and(B)0.10% formic acid in acetonitrile, and the flow rate was 0.35 mL•min⁻¹. ESI source in negative ion mode was used for MS detection. Structural identification was carried out according to the accurate mass and matching with database...
September 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/29218217/gastric-band-tubing-related-complication-during-pregnancy
#13
Yuni F Ongso, Han N Beh
In the past few decades, laparoscopic adjustable gastric banding is one of the most common bariatric procedures performed to treat morbid obesity. Device-related complication such as connection-tubing problem is rare. Here we present a case of gastric band tubing complication during pregnancy. This case illustrates the need to maintain high index of suspicion of gastric band device-related complication during pregnancy and early referral for bariatric surgical assessment is recommended.
November 2017: Journal of Surgical Case Reports
https://www.readbyqxmd.com/read/29216468/determination-of-legacy-and-novel-brominated-flame-retardants-in-dust-from-end-of-life-office-equipment-and-furniture-from-pretoria-south-africa
#14
Sylvia N Nkabinde, Jonathan O Okonkwo, Olubiyi I Olukunle, Adegbenro P Daso
Indoor dust is known to be a source of human exposure to brominated flame retardants (BFRs) and these consists of the legacy polybrominated diphenyl ethers (PBDEs), total hexabromocyclododecane (T-HBCDD) and the "Novel or alternate" Brominated flame retardants (NBFRs). In this study, x-ray fluorescence (XRF) analyser was employed to measure elemental bromine contents in office furniture and electronics as the first indication of the possible presence of BFRs. To investigate the possible BFRs present, a total of 21 dust samples were collected from surfaces of electronic equipment and office furniture and were analysed using gas chromatography-mass spectrometry (GC-MS)...
December 4, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29206914/simultaneous-determination-of-vinpocetine-and-its-major-active-metabolite-apovincaminic-acid-in-rats-by-uplc-ms-ms-and-its-application-to-the-brain-tissue-distribution-study
#15
Manman Wang, Lijuan Wang, Jinghan Sun, Lili Zhang, Longshan Zhao, Zhili Xiong
A specific, rapid and sensitive ultra-performance liquid chromatography-tandem mass spectrometric (UPLC-MS/MS) method was developed for simultaneous determination of vinpocetine (VP) and its active metabolite, apovincaminic acid (AVA) in rat brain regions, such as hypothalamus, striatum, cortex, cerebellum and hippocampus. Phenacetin was used as internal standard (IS). Brain tissue samples were precipitated protein by using 500 μL methanol. The separation was achieved on a Waters ACQUITY UPLC BEH C18 column (100 mm × 2...
December 1, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/29205055/determination-of-olopatadine-in-human-tears-by-hydrophilic-interaction-liquid-chromatography-ms-ms-method
#16
Jelena Maksić, Ana Stajić, Miroslav Knežević, Bojana Dačić, Krnjaja Biljana Jančić-Stojanović, Mirjana Medenica
AIM: The objective of the study was development of hydrophilic interaction liquid chromatography-ESI/MS/MS method for the determination of olopatadine in tear matrix. MATERIALS & METHODS: Separation was performed on Acquity BEH amide column (2.1 mm × 100 mm, 1.7 μm). The mobile phase was consisted of 0.1% formic acid in water and acetonitrile. Mianserin hydrochloride was implemented as an internal standard. The artificial tear fluid was used as matrix. The tear samples were collected using Schirmer test strips...
December 5, 2017: Bioanalysis
https://www.readbyqxmd.com/read/29202363/quantification-of-glycocholic-acid-in-human-serum-by-stable-isotope-dilution-ultra-performance-liquid-chromatography-electrospray-ionization-tandem-mass-spectrometry
#17
Cheng Guo, Cong Xie, Peili Ding, Guangming Qin, Weimin Mo, Xiaoji Cao, Shu Zheng
A rapid, accurate and sensitive stable isotope dilution ultra performance liquidchromatography electrospray ionization tandem mass spectrometry (ID-UPLC-ESI-MS/MS) method for the determination of glycocholic acid (GCA) in human serum was developed and validated. Serum samples were spiked with D5-glycocholic acid and then pretreated with protein precipitation. The analysis was performed on a Waters BEH C18 column (100 mm×2.1mm, 1.7μm), followed by ESI-MS/MS detection in negative ion mode under multiple reaction monitoring mode...
December 1, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29200714/simultaneous-determination-of-ten-constituents-in-chaiqin-qingning-capsule-by-high-performance-liquid-chromatography-coupled-with-triple-quadrupole-mass-spectrometry
#18
Ting Yu Li, Xiao Kui Huo, Lu Zheng, Chao Wang, Hai Jian Cong, Ting Xiang, Lin Zhang, Bao Jing Zhang, Shan Shan Huang, Bin Wu, Xin Yu Li
Background: Chaiqin Qingning Capsule (CQQNC) was a prescription of Traditional Chinese Medicine with the effects of clearing away heat and removing toxin, harmonizing the exterior and interior, it was widely used in Asian, for example, China and Japan, different batches of the raws materials and different processing time may be the vital factor which raised a challenge to control the quality of the CQQNC. Experimental Methods: In this experiment, a high-performance liquid chromatography-mass spectrometry/MS (HPLC-MS/MS) method was developed to simultaneously determine ten bioactive components for the quality control of CQQNC...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29182997/bioanalytical-methods-for-the-quantification-of-hydromorphone-fentanyl-norfentanyl-morphine-morphine-3%C3%A3-glucuronide-and-morphine-6%C3%A3-glucuronide-in-human-plasma
#19
Peter de Bruijn, Evelien J M Kuip, Mei-Ho Lam, Ron H J Mathijssen, Stijn L W Koolen
The aim of this study was to develop an assay for the quantification of hydromorphone, morphine, fentanyl and the metabolites norfentanyl, morphine-3ß-glucuronide and morphine-6ß-glucuronide in human plasma to support pharmacokinetic studies investigating the large interpatient variability in response to opioid treatment. For the quantitation of hydromorphone, morphine, fentanyl and its metabolite norfentanyl aliquots of 200μL human potassium EDTA plasma were deproteinized with deuterated internal standards in a mixture of acetonitrile and acetone, followed by a liquid-liquid extraction with 4% ammonium hydroxide and ethyl acetate...
November 17, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29175697/in-vivo-study-of-erysolin-metabolic-profile-by-ultra-high-performance-liquid-chromatography-coupleded-to-fourier-transform-ion-cyclotron-resonance-mass-spectrometry
#20
Binglong Li, Hui Zhou, Guochun Yang, Fei Han, Yanting Li, Yongfeng Gao, Jinwei Gao, Feng Zhang, Lixin Sun
An ultra high performance liquid chromatography coupled to Fourier transform ion cyclotron resonance mass spectrometry (UHPLC-FT-ICR-MS) method was developed for the first time to study the in vivo metabolism of erysolin, a compound derived from cruciferous plants which has a definite effect of anti-tumor and anti-nerve injury. In this research, the chromatographic separation was performed on an ACQUITY UPLC® BEH C18 column (2.1 mm×100mm, 1.7μm, Waters, USA) and eluted by a gradient program, the identification work was achieved on a Bruker ultra-high resolution spectrometer in positive ion mode...
November 16, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
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