Objective To establish HPLC method for determination of (R,S)-epigoitrin in Banlangen granules and discuss the content limitation. Methods The samples were separated on SHIMADZU VP-ODS (150 mm×4. 6 mm, 5 μm) and the mobile phase consisted of methol-0. 02% phosphoric acid solution (7:93) at a flow rate of 1. 0 mL. min-1 . The detection wavelength was set at 245 nm and the injection volume (in automatic sampler) was 10 μL. The content limitation was assessed according to the transfer rate and statistical data of the results. Results (R,S)-epigoitrin showed a good linear relationship at concentration of 0. 058 7 – 150. 349 5 μg·mL-1(r = 0. 999 7, n = 7). The average recovery rate was 98. 72% , 98. 40% and 98. 60% , respectively; RSD was 1. 84% , 0. 50% and 1. 82% , respectively. The content limitation of (R,S)-epigoitrin was unreasonable according to the transfer rate and the statistical data of the results. Conclusion The method is easy and simple to operate, accurate and stable in results, and highly specific, thus it is applicable for the quality control of Banlangen granules. The content limitation should be determined on the basis of pharmacokinetic and pharmacodynamic data.

Objective: To explore the action mechanism of electroacupuncture (EA) in improving the gastric motility of rats with diabetic gastroparesis (DGP). Methods: Forty-eight healthy Sprague-Dawley (SD) rats were randomly assigned into four groups: a normal group (group A), a model group (group B), a group of EA at acupoints (group C), and a group of EA at non-acupoints (group D), 12 rats in each group. The animal model of DGP was established by intraperitoneal injection of streptozotocin (STZ) plus high glucose and fat diet. The blood glucose, urine glucose and gastric emptying rate (GER) were observed. The content of insulin (INS) in serum and ghrelin in gastric antrum tissue were detected by enzyme linked immunoassay (ELISA). The expression of growth hormone secretagogue receptor mRNA (GHSR mRNA) in gastric antrum tissue was detected by real-time fluorescent quantitative polymerase chain reaction (PCR). Results:Compared with group A, blood glucose and urine glucose increased significantly (P<0.01), GER, content of serum insulin, the content of ghrelin and expression of GHSR mRNA in gastric antrum tissue decreased significantly (P<0.05 orP<0.01) in group B. Compared with group B, blood glucose and urine glucose decreased significantly (P<0.05), GER, the content of insulin in serum, the content of ghrelin and expression of GHSR mRNA in gastric antrum tissue increased significantly (P<0.05 orP<0.01) in group C. Conclusion: EA at acupoints can down-regulate the content of blood and urine sugar, and promote gastric emptying, which is possibly related to the regulation of serum insulin, and the expressions of ghrelin and GHSR mRNA in gastric antrum.