两种α-糖苷酶抑制剂体外筛选模型的改良与比较  

Modification and Comparison of Two in vitro Assay Methods for Screening α-Glucosidase Inhibitors Produced by Lactic Acid Bacteria

作　　者：文丽霞[1,2] 吴正钧[1] 郭本恒[1,2] 

机构地区：[1]光明乳业股份有限公司乳业生物技术国家重点实验室,上海200436 [2]上海海洋大学食品学院,上海201306

出　　处：《天然产物研究与开发》2015年第4期681-686,共6页Natural Product Research and Development

基　　金：国家"十二五"科技支撑计划(2013BAD18B01);"863"计划(2011AA100901)

摘　　要：α-糖苷酶抑制剂可以控制餐后血糖浓度波动,从而达到预防和治疗糖尿病的作用。本文对两种α-糖苷酶抑制剂体外筛选模型进行了改进。结果表明,以阿卡波糖作阳性对照,两种模型均适用于以脱脂乳为生长介质的产α-糖苷酶抑制剂的乳酸菌的筛选。选取12株特定乳酸菌分别用两种模型测其发酵脱脂乳上清对α-糖苷酶的抑制活性,两种模型筛选结果一致,但测得的抑制活性呈现一定的差异。当加入到脱脂乳中的阿卡波糖浓度较低时,以麦芽糖为底物的酶-抑制剂模型测得的α-糖苷酶抑制活性高于以4-硝基酚-α-D-吡喃葡萄糖苷(PNPG)为底物的酶-抑制剂模型。α-Glucosidase inhibitors are therapeutic agents for reducing postprandial hyperglycemia, which are widely applied in clinics for prevention and management of type II diabetes meUitus. In this study, two in vitro assay methods were modified to adopt the screening α-glycosidase inhibitors （α-GI） produced in reconstituted skimmed milk by lactic aeld bacteria, enrolling aearbose as a positive control. Both of the modified in vitro assay methods were proved to be suitable for screening α-GI produeod by lactic acid bacteria ,with the half inhibitory concentration （ IC50 ） for aearbose of 0.6056 mg/mL obtained by PNPG method and 0. 3843 mg,/mL by maltose α-glyeosidase method respectively. The inhibitory effects of 12 selected lactic acid baeterla strains were eonslstent between the PNPG and the maltose α-glyeosidase method, although the inhibitory rates measured by the latter method were slightly higher. When in low concentration, the in- hibitory rates of aearbose in reeonstitutod skimmed milk obtained by maltose a-glyeosidase （invertase） method were higher than those by PNPG method.

关 键 词：Α-糖苷酶抑制剂 阿卡波糖 4-硝基酚-α-D-吡喃葡萄糖苷 麦芽糖 乳酸菌 

分 类 号：R284.2[医药卫生—中药学]