[Study on the fingerprint of Morus alba from different habitats by HPLC].

OBJECTIVE: To establish HPLC fingerprint of Morus alba from different habitats by HPLC and provide basis for its quality control. METHODS: HPLC analysis was performed on an Agilent XDB C18 Column (4.6 mm x 250 mm, 5 microm), gradient eluted composed of acetonitrile and 0.3% phosphate acid. The column temperature was set at 35 degrees C and the flow rate was 0.5 mL/min. The detective wavelength was 290 nm. The HPLC fingerprint for 10 batches of Morus alba was studied on their similarity. RESULTS: There were twelve common peaks in the fingerprint. The similarity of 7 batches was above 0.9 and the other batches had low similarity. CONCLUSION: The HPLC fingerprint can be used for quality control of Morus alba with high characteristics and specificity.

[Effects of electroacupuncture at "Zusanli" (ST 36) on Pharmacokinetics of paracetamol in rates].

OBJECTIVE: To investigate influence of electroacupuncture at "Zusanli" (ST 36) on pharmacokinetics after oral administration of Paracetamol in rats and explore the effect and mechanism of acupuncture combined with medicinal drugs. METHODS: Forty-eight SD rats, in half respectively male and female, were randomly divided into 6 groups: Paracetamol groups of low, moderate, and high doses (oral dose of Paracetamol 300, 600 or 1200 mg/kg, respectively), and electroacupuncture plus Paracetamol groups of low, moderate, and high doses (electroacupuncture at "Zusanli" (ST 36) acupoint for 20 min after oral dose of Paracetamol 300, 600 or 1 200 mg/kg, respectively). Serum specimens of rats in each group were obtained at different time points to determine the concentrations of Paracetamol by RP-HPLC after oral administration of Paracetamol at different dosage, and the pharmacokinetic parameters were calculated by software 3P87, so as to observe the influence of electroacupuncture on absorption and metabolism of Paracetamol. RESULTS: Except in electroacupuncture plus Paracetamol groups of high doses group showing a non-linear dynamics model, the pharmacokinetics parameters of Paracetamol in the other fives groups were all fitted to first order grade absorption of two-compartment open model. Compared with the Paracetamol groups of low and moderate doses, the time to peak concentration (T(max)) was advanced (P < 0.01), the peak values of plasma concentration (C(max)) were significantly higher (P < 0.01), and the absorption half-life (T1/2ka) speeded up apparently (P < 0.01), but the elimination half-life (T1/2ke) remained basically unchanged (P > 0.05), and the area under the curve (AUC) increased significantly (P < 0.01), and plasma clearance (Cl(s)) was lower (P < 0.01) in the electroacupuncture plus Paracetamol groups of low and moderate doses. Compared with the Paracetamol group of high doses, the AUC also increased significantly (P < 0.01) and the mean residence time (MRT) postponed relatively (P < 0.05) in the electroacupuncture plus Paracetamol group of high doses. CONCLUSION: It indicates that clinical consideration must be given to the drug dosage and the possible influence of electroacupuncture on the metabolism of some drugs in order to avoid and reduce adverse reactions.