目的建立一种b型流感嗜血杆菌(Haemophilus influenzae type b,Hib)结合疫苗中游离多糖含量新的检测方法。方法分别对标准蛋白溶液、多糖溶液和标加衍生多糖(AH-PRP)的结合物原液进行脱氧胆酸钠(NaDC)酸沉淀处理,观察该方法对蛋白和多...目的建立一种b型流感嗜血杆菌(Haemophilus influenzae type b,Hib)结合疫苗中游离多糖含量新的检测方法。方法分别对标准蛋白溶液、多糖溶液和标加衍生多糖(AH-PRP)的结合物原液进行脱氧胆酸钠(NaDC)酸沉淀处理,观察该方法对蛋白和多糖的沉淀效果。分别采用NaDC酸沉淀法和乙醇分步沉淀法测定结合疫苗原液中的游离多糖含量。结果不同浓度的标准蛋白溶液经NaDC酸沉淀法处理后,沉淀中蛋白的回收率在96%～99%之间;不同浓度的多糖溶液经NaDC酸沉淀法处理后,上清中的多糖回收率在99%～106%之间;该方法对结合物中的游离多糖能起到很好的分离效果;两种方法测定结合疫苗原液中的游离多糖含量差异有统计学意义(P<0.01)。结论 NaDC酸沉淀法能专一性地沉淀蛋白物质,对游离多糖无沉淀作用,该方法具有良好的重复性和准确性,可用于测定Hib结合疫苗中的游离多糖含量。展开更多
Azilsartan(AZL), a poorly soluble drug, was considered to be fit for nanocrystals to improve its solubility. Our study intended to prepare AZL nanocrystals by means of bead milling method. Eight stabilizers or their b...Azilsartan(AZL), a poorly soluble drug, was considered to be fit for nanocrystals to improve its solubility. Our study intended to prepare AZL nanocrystals by means of bead milling method. Eight stabilizers or their binary combination and the milling time were set to be variable factors to optimize AZL nanosuspension formulation, and six types of freezedrying supports were investigated to reduce the aggregation of particles during the solidification. AZL nanocrystals with or without sodium deoxycholate(NaDC) as combined stabilizer with Poloxamer 188(F68) were prepared owning mean particle sizes of about 300 nm and 460 nm. During the screening processes, the formulation containing NaDC showed a smaller particle size and better stability during lyophilization. The irregular shape and crystal form changing in AZL nanocrystals were discovered by various characterizations. And with physical mixture as reference, nanocrystals showed its improvement about in-vitro dissolution and in-vivo bioavailability. In conclusion, the nanocrystals of AZL could be prepared well in our study. Additionally, our results suggested that NaDC was an appreciated excipient on the nanocrystals platform, which can exhibit the abilities of size-reduction and stabilitymaintaining on freeze-drying.展开更多
文摘目的建立一种b型流感嗜血杆菌(Haemophilus influenzae type b,Hib)结合疫苗中游离多糖含量新的检测方法。方法分别对标准蛋白溶液、多糖溶液和标加衍生多糖(AH-PRP)的结合物原液进行脱氧胆酸钠(NaDC)酸沉淀处理,观察该方法对蛋白和多糖的沉淀效果。分别采用NaDC酸沉淀法和乙醇分步沉淀法测定结合疫苗原液中的游离多糖含量。结果不同浓度的标准蛋白溶液经NaDC酸沉淀法处理后,沉淀中蛋白的回收率在96%～99%之间;不同浓度的多糖溶液经NaDC酸沉淀法处理后,上清中的多糖回收率在99%～106%之间;该方法对结合物中的游离多糖能起到很好的分离效果;两种方法测定结合疫苗原液中的游离多糖含量差异有统计学意义(P<0.01)。结论 NaDC酸沉淀法能专一性地沉淀蛋白物质,对游离多糖无沉淀作用,该方法具有良好的重复性和准确性,可用于测定Hib结合疫苗中的游离多糖含量。
基金financially supported by Science research project of Department of Education Liaoning Province(No.L2013390)
文摘Azilsartan(AZL), a poorly soluble drug, was considered to be fit for nanocrystals to improve its solubility. Our study intended to prepare AZL nanocrystals by means of bead milling method. Eight stabilizers or their binary combination and the milling time were set to be variable factors to optimize AZL nanosuspension formulation, and six types of freezedrying supports were investigated to reduce the aggregation of particles during the solidification. AZL nanocrystals with or without sodium deoxycholate(NaDC) as combined stabilizer with Poloxamer 188(F68) were prepared owning mean particle sizes of about 300 nm and 460 nm. During the screening processes, the formulation containing NaDC showed a smaller particle size and better stability during lyophilization. The irregular shape and crystal form changing in AZL nanocrystals were discovered by various characterizations. And with physical mixture as reference, nanocrystals showed its improvement about in-vitro dissolution and in-vivo bioavailability. In conclusion, the nanocrystals of AZL could be prepared well in our study. Additionally, our results suggested that NaDC was an appreciated excipient on the nanocrystals platform, which can exhibit the abilities of size-reduction and stabilitymaintaining on freeze-drying.
