目的研究盐酸伐昔洛韦多晶型溶解性和生物利用度,为提高其质量标准提供实验依据。方法采用溶解度测定法研究晶Ⅰ型、晶Ⅳ型和晶Ⅷ型盐酸伐昔洛韦的溶解度;SD大鼠灌胃给予不同晶型盐酸伐昔洛韦固体(100 mg.kg-1),采用反相高效液相色谱(RP-HPLC)法检测不同时间大鼠血药浓度,比较不同晶型药物的生物利用度。结果晶Ⅷ型在6种溶剂系统中溶解度均优于晶Ⅰ型、晶Ⅳ型;大鼠灌胃给予晶Ⅰ、晶Ⅳ和晶Ⅷ型盐酸伐昔洛韦后血中盐酸伐昔洛韦代谢产物阿昔洛韦Cmax分别为(10.304±5.246),(9.321±3.701)和(10.365±6.787)mg.L-1,晶Ⅰ型和晶Ⅷ型相近且高于晶Ⅳ型;AUC0→t分别为(20.167±1.775),(22.337±5.166)和(20.289±7.845)mg.L-1.h,晶Ⅳ型虽略高于晶Ⅰ型和晶Ⅷ型,但差异无统计学意义。结论盐酸伐昔洛韦晶Ⅰ型、晶Ⅳ型和晶Ⅷ型样品的溶解性质有一定差异,大鼠体内生物学表现基本相同。
Objective To study the bioavailability and solubility of valacyclovir hydrochloride for enhancing quality standards.Methods The solubility was determined and compared for the crystal form Ⅰ,Ⅳ,Ⅷ of valacyclovir hydrochloride,the latter of which were administered to SD rats at the dose of 100 mg·kg-1.And a HPLC method was established to test the plasma level of valacyclovir hydrochloride.Results The form Ⅷ was the most soluble form among the three forms in the six solvents.The indirect pharmacokinetic parameters of acyclovir,as the metabolites of the form Ⅰ,Ⅳ,Ⅷ of valacyclovir hydrochloride were as follows: Cmax was(10.304±5.246),(9.321±3.701) and(10.365±6.787) mg·L-1,respectively(P0.05);AUC0→t was(20.167±1.775),(22.337±5.166) and(20.289±7.845) mg·L-1·h,respectively(P0.05).Conclusion There is certain difference in solubility of valacyclovir hydrochloride among form Ⅰ,form Ⅳ and form Ⅷ,but no significant difference is found in biological actions in the body among them.