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Biomedical Chromatography: BMC

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https://www.readbyqxmd.com/read/28332230/screening-and-identification-of-multiple-constituents-and-their-metabolites-of-zhi-zi-chi-decoction-in-rat-urine-and-bile-by-uplc-q-tof-ms-ms
#1
Wei Feng, Qiuju Dong, Minyan Liu, Si Li, Ting Liu, Xinguo Wang, Liying Niu
Zhi-zi-chi decoction (ZZCD) is a classical formula widely used in Chinese clinical application. In the present study, a novel and efficient strategy has been developed for screening and identification of multiple constituents and their metabolites of ZZCD using ultra high performance liquid chromatography combined with triple TOF mass spectrometry. The novel approach of an on-line data acquisition method dependent on multiple mass defect filter and dynamic background subtraction is combined with multiple data processing techniques...
March 23, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28321891/comparative-pharmacokinetic-study-of-pyranocoumarins-and-khellactone-in-normal-and-acute-lung-injury-rats-after-oral-administration-of-peucedanum-praeruptorum-dunn-extracts-using-a-rapid-and-sensitive-lc-ms-ms-method
#2
An Kang, Tong Xie, Dong Zhu, Yu Dong, Hongmei Wen, Yuqiong Pei, Jinjun Shan, Liuqing Di
Pyranocoumarins are the main constitutes in Peucedanum praeruptorum Dunn, and possess various biological activities. In this article, we developed and validated a rapid and sensitive liquid chromatography (LC) tandem mass spectrometry method for targeted quantification of praeruptorin A, praeruptorin B, praeruptorin E and khellactone, a common metabolite of these pyranocoumarins in rat plasma samples. We then performed a comparative pharmacokinetic study of these pyranocoumarins and khellactone in normal and LPS induced acute lung injury (ALI) rats following oral administration of Peucedanum praeruptorum Dunn extracts...
March 21, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28317135/free-mycophenolic-acid-determination-in-human-plasma-ultrafiltrate-by-a-validated-liquid-chromatography-tandem-mass-spectrometry-method
#3
Paulina Łuszczyńska, Tomasz Pawiński, Paweł K Kunicki, Katarzyna Sikorska, Ryszard Marszałek
OBJECTIVES: The aim of this study was to develop and fully validate LC-MS/MS method for free mycophenolic acid (MPA) concentration measurements in plasma ultrafiltrate that will be reliable and simple in preparation with deuterated MPA (MPA-d3) chosen as an internal standard. METHODS: The chromatographic separation was made with Zorbax Eclipse XDB-C18 column (4.6x150 mm) using a gradient of two solutions as a mobile phase: A) water and B) methanol, each containing 0...
March 20, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28317144/uhplc-ms-ms-method-for-the-determination-of-omarigliptin-in-rat-plasma-and-its-application-to-a-pharmacokinetic-study-in-rats
#4
Meng-Fang Li, Xiao-Xia Hu, Ai-Qun Ma
Omarigliptin is a novel long-acting DPP-4 inhibitor used for the treatment of T2DM. In this work, a sensitive and selective UHPLC-MS/MS method was developed and validated for determination of omarigliptin in rat plasma. Sample preparation was performed by protein precipitation with acetonitrile. Chromatographic separation of analytes was achieved on a RRHD Eclipse Plus C18 column (2.1 × 50 mm, 1.8 µ), using gradient mobile phase (0.1% formic acid-acetonitrile) at a flow rate of 0.4 mL/min. Detection was performed in multiple reaction monitoring mode, with target fragment ions m/z 399...
March 19, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28299812/the-effect-of-tripterygium-glucoside-tablet-on-pharmacokinetics-of-losartan-and-its-metabolite-exp3174-in-rats
#5
Yongsheng Hu, Xuexue Zhou, Hui Shi, Wenyu Shi, Shengjie Ye, Hai Zhang
Losartan and tripterygium glucoside tablet (TGT) are often simultaneously used for reducing urine protein excretion in clinic. However, it was unknown whether there is potential herb-drug interaction between losartan and TGT. The aim of this study was to investigate their potential herb-drug interaction, and clarify the mechanism of the effect of TGT on the pharmacokinetics of losartan and its metabolite EXP3174 in rats. The plasma concentration of losartan and EXP3174 were determined by LC-MS, and the main pharmacokinetic parameters were calculated...
March 16, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28299804/simultaneous-determination-of-piperaquine-and-its-n-oxidated-metabolite-in-rat-plasma-using-lc-ms-ms
#6
Huixiang Liu, Meitong Zang, Aijuan Yang, Jianbo Ji, Jie Xing
A sensitive and efficient liquid chromatography tandem mass spectrometry method was firstly developed and validated for the simultaneous determination of piperaquine (PQ) and its N-oxidated metabolite (PQ-M) in plasma. A simple protein precipitation procedure was used for sample preparation. Adequate chromatographic retention was achieved on a C18 column under gradient elution with acetonitrile and 2 mM aqueous ammonium acetate containing 0.15% formic acid and 0.05% trifluoroacetic acid. A triple-quadrupole mass spectrometer equipped with an electrospray source was set up in the positive ion mode and multiple reaction monitoring mode...
March 16, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28295437/a-novel-assay-to-determine-acetylcholinesterase-activity-the-application-potential-for-screening-of-drugs-against-alzheimer-s-disease
#7
Liang Peng, Zhengxing Rong, Hao Wang, Biyun Shao, Lei Kang, Hong Qi, Hongzhuan Chen
Acetycholinesterase (AChE) that regulates hydrolysis of acetylcholine (ACh) in the brain, is an important target for treatment of Alzheimer's disease (AD) featured by ACh deficiency. However, the methods to precisely determine AChE activity are still under development. Here, we created a new method to exploit acetylcholine-d4 (ACh-d4 ) as a surrogate substrate of ACh and measure product choline-d4 (Ch-d4 ) via liquid chromatography-tandem mass spectrometry (LC-MS/MS). This assay detected activity of AChE present in the normal mouse brain, which is consistent with the standard Ellman assay that determines products spectrophotometrically...
March 10, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28294369/a-simple-and-cost-effective-hplc-uv-method-for-the-detection-of-levetiracetam-in-plasma-serum-of-patients-with-epilepsy
#8
REVIEW
Lynette Engelbrecht, C J Grobler, Malie Rheeders
A simple, fast and cost-effective method was developed and validated for the determination of levetiracetam (LEV) in plasma/serum of patients using high performance liquid chromatography (HPLC) with ultra violet detection. The stability of LEV plasma/serum samples over time and in different blood collection tubes was evaluated. Serum/plasma samples were deproteinised by methanol spiked with the internal standard, gabapentin. HPLC was carried out on a Venusil XBP C18, 250 x 4.6 mm, 5 µm column, flow rate of 1...
March 10, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28294360/development-of-a-lc-ms-ms-method-for-quantification-of-two-pairs-of-isomeric-flavonoid-glycosides-and-other-ones-in-rat-plasma-application-to-pharmacokinetic-studies
#9
Sixi Zhang, Yang Xie, Jing Wang, Yanmei Geng, Yu Zhou, Chengxin Sun, Guangshu Wang
An liquid chromatography-tandem mass spectrometry (LC-MS/MS) method was developed and validated for simultaneous determination of six flavonoid glycosides including isoorientin (1), orientin (2), 2″-O-β-D-xylopyranosyl isoorientin (3), 2″-O-β-D-xylopyranosyl isovitexin (4), 6-C-L-α-arabipyranosyl vitexin (5), and vitexin (6) in rat plasma using isoquercitrin as the internal standard (IS). Plasma samples were prepared by a one-step protein precipitation with acetonitrile. Chromatographic analysis was carried out on a 25-cm C18 column with a gradient mobile phase consisting of acetonitrile and 0...
March 10, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28273367/lc-ms-ms-method-for-simultaneous-determination-of-flavonoids-and-physalins-in-rat-plasma-application-to-pharmacokinetic-study-after-oral-administration-of-physalis-alkekengi-var-franchetii-chinese-lantern-extract
#10
Yaqing Guo, Hongxia Liu, Liqin Ding, Mahmood Oppong, Guixiang Pan, Feng Qiu
A rapid and sensitive liquid chromatography with tandem mass spectrometry (LC-MS/MS) method was developed and validated for the simultaneous determination of luteolin, luteolin-7-O-glucopyranoside, physalin A, physalin D and physalin L in rat plasma. Scutellarein and dexamethasone were used as the internal standards (IS). Plasma samples were prepared by liquid-liquid extraction with ethyl acetate. The five constituents were separated on an Acquity UPLC BEH C18 column (100 mm × 2.1 mm, 1.7 µm). A gradient elution procedure was used with acetonitrile(A) - 0...
March 8, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28266722/development-and-validation-of-a-hplc-uv-method-for-the-simultaneous-determination-of-the-antipsychotics-clozapine-olanzapine-and-quetiapine-several-beta-blockers-and-their-metabolites
#11
Margarete Silva Gracia, Alexandra Köppl, Sandra Unholzer, Ekkehard Haen
A simple, accurate and selective column-switching high performance liquid chromatography (HPLC) method was developed and validated for simultaneous quantification of six beta-blockers (metoprolol MET, timolol TIM, bisoprolol BIS, propranolol PRO, carvedilol CAR and nebivolol NEB), three of their metabolites (α-hydroxy metoprolol α-HMET, N-desisopropyl propranolol DIPRO and 4'-hydroxy carvedilol 4-HCAR), three antipsychotics (olanzapine OLA, clozapine CLO and quetiapine QUE) and three of their metabolites (N-desmethyl olanzapine DMOLA, N-desmethyl clozapine DMCLO and N-desalkyl quetiapine DAQUE) in human serum...
March 7, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28261841/a-sensitive-quantitative-assay-for-the-determination-of-propafenone-and-two-metabolites-5-hydroxypropafenone-and-n-depropylpropafenone-in-human-k2edta-plasma-using-lc-ms-ms-with-esi-operated-in-a-positive-mode
#12
Harilal Patel, Ashok Ghoghari, Chandrakant Bhatt, Shaival Shah, Anilkumar Jha, Nirmal Desai, Nuggehally R Srinivas
Propafenone is a potent antiarrhythmic agent; clinically propafenone has been used for a number of cardiac arrhythmias because it possesses multiple modes of action, via beta adrenergic receptor blockade and calcium antagonistic activity. Propafenone (PPF) exhibits extensive saturable presystemic biotransformation (first pass effect) resulting into two active metabolites; 5- hydroxypropafenone (5-OH PPF) formed by CYP2D6 and N-depropylpropafenone (NDP) formed by both CYP3A4 and CYP1A2 enzymes. A specific and sensitive LC-MS/MS method was developed and validated for quantitation of PPF, 5-OH PPF and NDP using turboion spray in a positive ion mode...
March 6, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28236316/simultaneous-determination-of-wogonin-oroxylin-a-schisandrin-paeoniflorin-and-emodin-in-rat-serum-by-hplc-ms-ms-and-application-to-the-pharmacokinetic-studies
#13
Minting Chen, Suying Wei, Chaohua Luo, Feilong Chen, Shuai Song, Qun Shen, Zhixian Mo, Fenghuan Wei
Wogonin and oroxylin A in Scutellariae Radix, schisandrin in Chinensis fructus, paeoniflorin in Moutan Cortex and emodin in Polygoni Cuspidate Rhizome et Radix are anti-inflammatory active compounds. A method for simultaneous determination of the five compounds in rat was developed and validated using high performance liquid chromatography with tandem mass spectrometry (HPLC-MS/MS). The separation was performed on a Symmetry C18 column (4.6 × 50 mm, 3.5 µm) with acetonitrile and 0.1% formic acid aqueous solution as the mobile phases...
February 24, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28233340/dissipation-kinetics-and-pre-harvest-residue-limit-of-pyriofenone-in-oriental-melon-cucumis-melo-var-makuwa-grown-under-regulated-climatic-conditions
#14
Hyung Suk Chung, Md Humayun Kabir, A M Abd El-Aty, Han Sol Lee, Md Musfiqur Rahman, Byung-Joon Chang, Ho-Chul Shin, Jae-Han Shim
A high-performance liquid chromatography-ultraviolet detection was used to estimate the disappearance rates as well as the pre-harvest residue limits (PHRLs) of pyriofenone in oriental melon (Cucumis melo var. makuwa) grown under greenhouse conditions in two different locations (A and B) in Seongju, Republic of Korea. The identity of the compound in standard solution and representative field incurred samples was confirmed using liquid chromatography-tandem mass spectrometry (LC-MS/MS). The method was validated in terms of linearity, limits of detection and quantification, accuracy (expressed as recovery %), and precision (expressed as relative standard deviation %) for accurate and precise quantitation...
February 23, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28214376/sensitive-quantification-of-coixol-a-potent-insulin-secretagogue-in-scoparia-dulcis-extract-using-high-performance-liquid-chromatography-combined-with-tandem-mass-spectrometry-and-uv-detection
#15
Arslan Ali, Faraz Ul Haq, Qamar Ul Arfeen, Khaga Raj Sharma, Achyut Adhikari, Syed Ghulam Musharraf
Diabetes is a major global health problem which requires new studies for its prevention and control. Scoparia dulcis, an herbal product, is widely used for treatment of diabetes. Recent studies demonstrate coixol as a potent and non-toxic insulin secretagogue from S. dulcis. This study focuses on developing two quantitative methods of coixol in Scoparia dulcis methanol-based extracts. Quantification of coixol was performed using high performance liquid chromatography-tandem mass spectrometry (method 1) and high performance liquid chromatography-ultraviolet detection (method 2) with limit of detection of 0...
February 18, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28214354/long-chain-unsaturated-fatty-acids-as-possible-important-metabolites-for-primary-angle-closure-glaucoma-based-on-targeted-metabolomic-analysis
#16
Shengzhong Rong, Yang Li, Yue Guan, Lili Zhu, Qiang Zhou, Mucong Gao, Hongzhi Pan, Lina Zou, Dong Chang
Primary angle-closure glaucoma (PACG) is a severe chronic neurodegenerative disease in Asia. Identification of important metabolites associated with PACG is crucial for early intervention and advancing knowledge of the disease mechanism. We applied gas chromatography-mass spectrometry (GC-MS) for targeted metabolomic analysis on serum samples from thirty-eight newly diagnosed PACG patients and forty-eight controls. Palmitoleic acid (PA), linoleic acid (LA), gamma-linolenic acid (GLA) and arachidonic acid (ARA) were identified as important metabolites associated with PACG...
February 18, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28212467/comparison-of-6-mercaptopurine-with-6-thioguanine-for-the-analysis-of-thiopurine-s-methyltransferase-activity-in-human-erythrocyte-by-lc-ms-ms
#17
Shenghui Mei, Xindi Li, Xiaoqing Gong, Xiaoyi Zhang, Xingang Li, Li Yang, Leting Zhu, Heng Zhou, Yonghong Liu, Anna Zhou, Xinghu Zhang, Zhigang Zhao
Thiopurines (TPDs) are first-line drugs in treating neuromyelitis optica spectrum disorders (NMOSD). Thiopurine S-methyltransferase activity (TPMT), a major determinant of TPDs toxicity, was suggested to be evaluated before TPDs treatment by using 6-mercaptopurine (6-MP) and 6-thioguanine (6-TG) as substrate. However, the equivalent of the two substrates in TPMT activity evaluation was unknown, and alternative substrate was required in TPMT activity evaluation in patients who were already taking 6-MP or 6-TG...
February 17, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28211075/preclinical-pharmacokinetics-of-novel-trioxane-antimalarial-drug-99-411-several-unanswered-questions-and-development-perspectives
#18
LETTER
Nuggehally R Srinivas
No abstract text is available yet for this article.
February 16, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28205294/simultaneous-determination-of-the-bioactive-components-in-rat-plasma-by-uplc-ms-ms-and-application-in-pharmacokinetic-studies-after-oral-administration-of-radix-scutellariae-extract
#19
Jin-Hua Tao, Jun Xu, Shu Jiang, Yong Ling, Dong-Geng Wang
A highly sensitive and rapid ultraperformance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) method has been developed and validated for simultaneous quantification of the four main bioactive compounds, i.e. baicalin, baicalein, wogonoside and wogonin, in rat plasma after oral administration of Radix Scutellariae extract. Clarithromycin was used as an internal standard (IS). Plasma samples were processed by protein precipitation with methanol. The separation was performed on an Acquity BEH C18 column (100 × 2...
February 16, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28205258/simultaneous-quantification-of-antofloxacin-and-its-major-metabolite-in-human-urine-by-hplc-ms-ms-and-its-application-to-a-pharmacokinetic-study
#20
Yunsu Ma, Qianru Wang, Hongwen Zhang, Lijun Xie, Juan Chen, Mao Huang, Yun Liu, Yuanyuan Wang, Libin Wang, Luning Sun, Ning Ou
This study presents a high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) method for the simultaneous determination of antofloxacinin and its main metabolite-N-demethylated metabolite (N-DM) in human urine, ornidazole was used as the internal standard (IS). This was a clinical urine recovery study, in which 10 healthy Chinese volunteers were intravenously administered a single 200 mg antofloxacin hydrochloride. Compounds were extracted by albumen precipitation, after which, samples were isocratic eluted by a Poroshell 120 SB-C18 column, and were analysed using HPLC-MS/MS under electronic spray ionization (ESI) positive ion mode...
February 16, 2017: Biomedical Chromatography: BMC
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