[Correlation between dissolution in vitro and absorption in vivo of chuanping sustained release tablets].

Objective: To investigate the correlation between dissolution in vitro and absorption in vivo of Chuanping sustained release tablets.

Method: The ephedrine, pseudoephedrine were chosen as marker components, dissolution in vitro of Chuanping sustained release tablets in the different pH were tested by the rotating basket method and HPLC; urine drug levels were determined by HPLC and absorption fractions were calculated according to Wagner-Nelson's formula and deconvolution technique.

Result: The linear regressive equation between the absorption percentage in vivo F and accumulative release percentage in vitro of Chuanping sustained release tablets was established as F(ephedrine) = 1.

[Evaluation of balanced release of complex components of Chuanping sustained tablets based on fingerprint].

To combine fingerprint and drug release rate in vitro, in order to study in vitro release of complex components of Chuanping sustained tablets, compound traditional Chinese medicine preparation. A qualitative determination of the characteristic peaks of the compound preparations were conducted by the fingerprint. The results of the dissolution rate determination under different release conditions showed that the release of three index components (methamphetamine, pseudoephedrine and scopolamine) of Chuanping sustained tablets was less affected by gastrointestinal factors, with similarity factors being more than 80 with unknown component release curves of three major characteristic peaks in the fingerprint.