Effects of components in Biqi Capsulae prescription compatibility on activities of cytochrome P450 in vivo / 中草药

Objective: To investigate and evaluate the effect of components in Biqi Capsulae prescription compatibility on activities of cytochrome P450 (CYP450) in vivo. Methods: A new "Cocktail" one point method has been established, including five probes of Phenacetin, Tolbutamide, mephenytoin, Dextromethorphan, and midazolam. An LC-MS/MS analytical method has been established to determine the above five probes and their corresponding metabolites to analyze and evaluate the potential in vivo induction and (or) inhibition of components from Biqi Capsulae on the above five CYP450 in rats. Results: Biqi Capsulae prescription has compatibility based on CYP450. Compared with blank group, groups of "principal + assistant", "principal + mediator", "principal + assistant + complement", "principal + assistant + mediator", "principal + complement + mediator", and whole Biqi Capsulae could significantly induce the activity of CYP1A2. Moreover, groups of "principal + assistant", "principal + assistant + complement", "principal + assistant + mediator", and whole Biqi Capsulae could significantly induce the activity of CYP2C9. Conclusion: Biqi Capsulae prescription has significant compatibility based on CYP450. These results provide the important information and establish good foundation for further investigation on scientificalness and safety of Biqi Capsulae prescription compatibility.

Determination of tramadol hydrochloride in serum samples by disk solid phase extraction and gas chromatography-mass spectrometry in selected ion monitoring / 法医学杂志

OBJECTIVE@#Disk solid phase extraction (SPE) was assessed for tramadol hydrochloride from serum.@*METHODS@#The SPE was performed with SPEC C18AR/MP3 Disk SPE cartridge, offering hydrophobic C18 and strong cation ionic exchange interactions for the analytes, before being added into extraction column, 1 mL serum was diluted by 2 mL 0.1 mol/L phosphate buffer solution (pH 6) and the eluent was ethyl acetate containing 2% ammonia. Then SKF525 was added as internal standard into samples, which would be extracted simultaneously with analyte,quantitatively, determined by GC/MS/SIM.@*RESULTS@#The extraction recovery of tramadol hydrochloride was 98.9%, 92.5% and 84.8% for serum samples with corresponding amounts of standard addition of 0.1 microg/mL, 0.2 microg/mL and 0.5 microg/mL. And RSD measured 5 times was 3.2%, 8.7% and 10.9% respectively. The linear range varied from 0.1 microg/mL to 4 microg/mL. The multinomial regression correlation coefficient (r2) equaled 0.9939, and the detection limit was 21 ng/mL. After the same extraction column was continuously used for 5 times, there was no jam, pollution and decline of recovery and RSD.@*CONCLUSION@#This method is suitable for forensic toxicological analysis.

A color test for rapid screening of gamma-hydroxybutyric acid (GHB) and gamma-butyrolactone (GBL) in drink and urine / 法医学杂志

OBJECTIVE@#A rapid color test for screening gamma-hydroxybutyric acid (GHB) and its precursor gamma-butyrolactone(GBL) was investigated in drink and urine samples.@*METHODS@#In an acidic solution, GHB was converted to GBL, which reacted with hydroxylamine hydrochloride in presence of sodium hydroxide, forming hydroxamate. A purple complex was formed when hydroxamate reacted with ferric chloride in acidic condition.@*RESULTS@#Detection limit concentrations of GHB in drinks were between 0.5-2 mg/mL, less than the popular abuse concentrations of GHB. This method was usable for urine, with detection limit concentration 0.5 mg/mL. Interferences of common organic solvents and narcotics and depressants were surveyed.@*CONCLUSION@#This method is simple, safe, and rapid; it facilitates rapid screening of GHB and GBL in clinic and forensic laboratories.