Determination of benzopyrene in red clover extract by high performance liquid chromatography with spectrofluorescence detector / 中国中药杂志

<p><b>OBJECTIVE</b>To establish a high performance liquid chromatography method with spectrofluorescence detector for the quantitative analysis of benzopyrene in red clover extract.</p><p><b>METHOD</b>Analysis was performed on Hypersil C18 column (4. 6 mm x 200 mm, 5 microm) with acetonitrile and water (70: 30) as mobile phase; The excitation wavelength and emission wavelengh were 368 nm and 405 nm, respectively; Flow rate was 1.0 mL x min(-1).</p><p><b>RESULT</b>The linear range was 0.93-37.2 ng x mL(-1), and r = 0.9992 (n = 5). The average recovery of benzopyrene was 85.2% (n = 9).</p><p><b>CONCLUSION</b>The method was convenient and accurate with good recovery.</p>

Simultaneous determination of resveratrol, emodin, chrysophanol, physcion, in root of Polygonam cuspidatum and its extract by HPLC / 中国中药杂志

<p><b>OBJECTIVE</b>To establish a HPLC method for simultaneous determination of resveratrol, emodin, chrysophanol, physcion in root of Polygonum cuspidatum and its extract.</p><p><b>METHOD</b>The separation was performed in a Hypersil ODS C18 column with a mobile phase of Acetonitrile-1%HAc. The flow rate was 1.0 mL x min(-1) and detection wavelength was at 287 nm.</p><p><b>RESULT</b>The mean recovery and RSD of resveratrol, emodin, chrysophanol, physcion was 101.8%, RSD 1.7%; 96.2%, RSD 1.4%; 99.7%, RSD 1.0%; 98.60%, RSD 0.97% respectively.</p><p><b>CONCLUSION</b>The method is accurate, simple and reliable. It can be used for quality control of P. cuspidatum and its extract.</p>