Simultaneous determination of 8 bioactive isoflavonoids in Astragali Radix by UHPLC equipped with core-shell column / 中国中药杂志

This research aims to develop an UHPLC method, based on core-shell column(i.e. superficially porous particles), for simultaneous determination of eight isoflavonoids including formononetin,(6αR,11αR)-3-hydroxy-9,10-dimethoxypterocarpan, calycosin-7-O-β-D-glucopyranoside,(3R)-7,2-dihydroxy-3,4-dimethoxyisoflavone, calycosin, ononin,(6αR,11αR)-9,10-dimethoxypterocarpan-3-O-β-D-glucopyranoside, and(3R)-7,2-dihydroxy-3,4-dimethoxyisoflavan-7-O-β-D-glucopyranoside in Astragali Radix. The analysis was performed on an Agilent Poroshell EC-C_(18 )column(2.1 mm×100 mm, 2.7 μm) with 0.2% formic acid solution(A)-acetonitrile(B) as mobile phase for gradient elution. The flow rate was 0.5 mL·min~(-1), with column temperature of 40 ℃ and the wavelengths were set at 260 and 280 nm. According to the results, all calibration curves showed good linearity(R~2>0.999 8) within the tested concentration ranges. Both the intra-and inter-day precisions for 8 isoflavonoids were less than 0.80%, with the mean recovery at the range of 94.71%-104.6%. Thus, the newly developed UHPLC method using core-shell column owned the advantages in terms of rapid analysis, low column pressure and less solvent consumption, thus enabling the usage of conventional HPLC systems. Meanwhile, quantitative evaluation was carried out for 22 batches of commercial Astragali Radix. It has been found that great variations occurred for the content of the individual isoflavonoids among different batches; in contrast, the total content of total 8 isoflavonoids(>0.1%) was stable in most samples, indicating that it was reasonable to involve all isoflavonoids as the chemical markers for the quality control of Astragali Radix.

Validated, Ultra High Efficiency RP-HPLC and Stability Indicating Method for Determination of Tranylcypromines Sulphate in Bulk and in Tablet Dosage Forms.

Simple, sensitive, rapid and stability indicating ultra high efficiency RP-HPLC method was developed and validated for analysis of Tranylcypromine sulphate in bulk drug and in tablet dosage forms. Well- resolved peaks of target analyte and its degradation products were achieved on a Kinetex® column (75 mm x 4.6 mm ID) 2.6 μm at 30 °C, using simple isocratic mobile phase of acetonitrile - orthophosphoric acid 0.1 % (10: 90, v/v). The flow rate was 1.0 mL/min and the detection was performed at 220 nm. The retention time of the drug was 2 min while for the reported method was 6.7 min. The method was validated according to International Conference on Harmonization (ICH) guidelines. Tranylcypromine was subjected to the stress conditions of hydrolytic acidic, basic, oxidative, and photolytic degradation. The assay was linear over the concentration range of 3-150 μg mL-1 and the correlation coefficient was 1. The RSD% of inter and intraday precision was less than 1 %. The % recoveries were found to be 100.58 % proved that the proposed method is sufficiently accurate and precise. The method distinctly separates the drug from its degradation products within 2 min and total run time of 8 min.