Study on local pharmacokinetics of baicalin gel after transdermal administration in rats by skin microdialysis in vivo / 药学实践杂志

ABSTRACT

Objective To develop a novel skin microdialysis technology in vivo,and to determine the pharmacokinetic of ba-icalin after transdermal administration in rats. Methods An HPLC-MS/MS method used for the determination of baicalin in skin mi-crodialysis samples was established ,SD rats were pretreated with skin microdialysis operation under anesthesia , and then the baicalin gel was applied to the skin surface of probe in vivo.The baicalin concentration of skin microdialysates was determined , the time curve of baicalin concentration was drawn and the topical pharmacokinetics parameters of percutaneous absorption was calculated. Results Baicalin was optimized at the transitions m/z 447.3→271.2.The linearity correlation was good and the assay exhibited good precision and accuracy.The subcutaneous probe recovery of baicalin in vivo was(24.40 ±0.91)%and was stable over the 240 min study peri-od.Baicalin could be detected in the microdialysis samples after transdermal administration , and its concentration continued to rise in 8 h.AUC0-t in skin tissue was(50.04 ±34.17) mg· min· L-1. Conclusion The method of skin microdialysis in vivo could be used in the local pharmacokinetic research of baicalin.