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771.
Priyanka A. Shah Pranav S. Shrivastav Jaivik V. Shah Archana George 《Biomedical chromatography : BMC》2019,33(4)
A single LC–MS/MS assay has been developed and validated for the simultaneous determination of metformin and dapagliflozin in human plasma using ion‐pair solid‐phase extraction. Chromatographic separation of the analytes and their internal standards was carried out on a reversed‐phase ACE 5CN (150 × 4.6 mm, 5 μm) column using acetonitrile–15 mm ammonium acetate, pH 4.5 (70:30, v/v) as the mobile phase. To achieve higher sensitivity and selectivity for the analytes, mass spectrometric analysis was performed using a polarity switching approach. Ion transitions studied using multiple reaction monitoring mode were m/z 130.1 [M + H]+/60.1 for metformin and m/z 467.1 [M + CH3COO]?/329.1 for dapagliflozin in the positive and negative modes, respectively. The linear calibration range of the assay was established from 1.00 to 2000 ng/mL for metformin and from 0.10 to 200 ng/mL for dapagliflozin to achieve a better assessment of the pharmacokinetics of the drugs. The limit of detection and limit of quantitation for the analytes were 0.39 and 1.0 ng/mL for metformin and 0.03 and 0.1 ng/mL for dapagliflozin, respectively. There was no interference of plasma matrix obtained from different sources, including hemolyzed and lipemic plasma. The method was successfully applied to study the effect of food on the pharmacokinetics of metformin and dapagliflozin in healthy subjects. 相似文献
772.
Youdong Cheng Sai Kishore Ravi Yuxiang Wang Jifang Tao Yuandong Gu Swee Ching Tan Dan Zhao 《中国化学快报》2018,29(6):869-872
Four chemically stable covalent organic nanosheets are successfully synthesized at the air-water interface with large later size and tunable hydrophobicity, with potential applications as functional coating and membrane materials. 相似文献
773.
Sunitha V. Kumar A. Kishore Lincoln Ch. Abraham Jalapathi P. Reddy V. Gopal 《Russian Journal of General Chemistry》2018,88(12):2669-2674
Russian Journal of General Chemistry - A series of novel benzofuran-isoxazole 7a–7j hybrid heterocyclic molecules are synthesized. The structures of compounds 7a–7j are assessed by IR,... 相似文献
774.
Kishore K. Madapu N. R. Ku S. Dhara C. P. Liu A. K. Tyagi 《Journal of Raman spectroscopy : JRS》2013,44(5):791-794
We report the vibrational properties of vertical and oblique InN nanorods (NRs) grown by molecular beam epitaxy (MBE). Surface optical (SO) Raman mode at 561 cm−1, belonging to E1 symmetry [SO(E1)], is identified along with symmetry allowed Raman modes of E2(low), E2(high), and E1(LO) at 87, 489, and 589 cm−1, respectively, corresponding to wurtzite InN phase. Usually, SO phonon modes arise due to breakdown of translational symmetry of surface potential at surface defects, which are attributed by the surface roughness. Intensity distribution of E1(LO) and SO(E1) phonon modes over a specified area have been analysed using Raman area mapping with an optical resolution of 400 nm. Imaging with E1(LO) phonon mode, originating from the bulk of the sample, distinguishes the vertical NRs alone. We are able to resolve NR morphologies in both vertical and oblique cases with additional Raman mapping analysis of SO(E1) phonon mode, emerging from the surface irregularities, which are confined to the tip of MBE grown NRs. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献