可溶性膳食纤维对玉米淀粉体外消化的抑制作用  

Inhibitory Effects of Soluble Dietary Fibers on the in Vitro Digestion of Corn Starch

作　　者：李智 艾连中 丁文宇[2] 张宪党[2] 张汇 LI Zhi;AI Lian-zhong;DING Wen-yu;ZHANG Xian-dang;ZHANG Hui(School of Medical Instrument and Food Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Shandong Institute of Endocrine and Metabolic Diseases,Shandong Academy of Medical Sciences,Jinan 250062,China)

机构地区：[1]上海理工大学医疗器械与食品学院,上海食品微生物工程技术研究中心,上海200093 [2]山东省内分泌与代谢病研究所,山东济南250062

出　　处：《食品工业科技》2019年第19期1-6,12,共7页Science and Technology of Food Industry

基　　金：国家自然基金项目(31601428);山东省重点研发计划(2018YYSP003,2018YYSP030)

摘　　要：本文通过模拟人体胃肠道消化过程,研究四种可溶性膳食纤维(青棵0-葡聚糖(barley 0-glucan,BBG)、黄原胶(xanthan gum,XG)、魔芋胶(konjac glucomannan,KGM)和罗望子胶(tamarind seed polysaccharide,TSP))对玉米淀粉消化的影响,并建立膳食纤维在胃肠道模拟体系下的表观黏度(60s-1)与预测血糖指数(predicted glycemic index,pGI)之间的关系,探究可溶性膳食纤维降低餐后血糖响应的机理。结果表明,添加0.1%的BBG、XG、KGM和TSP对淀粉水解的抑制率分别达到11.59%、35.90%、30.54%和19.62%,并能将淀粉的pGI值分别降低12.05、45.54、38.90和15.00。并且,随着可溶性膳食纤维在胃肠道体系下的表观黏度的增大,pGI值呈下降趋势,并且当XG、KGM和TSP的表观黏度超过4 mPa?s后,pGI值的下降趋势愈加平缓。因此,可溶性膳食纤维能够抑制玉米淀粉的消化,并且其黏度是降低餐后血糖响应的重要因素。此研究将为可溶性膳食纤维在降血糖功能方面的应用奠定理论基础.In this study,the effects of four kinds of soluble dietary fibers(barley β-glucan(BBG),xanthan gum(XG),konjac glucomannan(KGM),and tamarind seed polysaccharide(TSP))on the digestion of corn starch(CS)were studied by simulating human gastrointestinal digestion. In addition,by establishing the relationships between the viscosities of soluble dietary fibers and predicted glycemic index(pGI),the mechanisms by which soluble dietary fibers reduce the postprandial glycemic response were explored. The results showed that inhibition rates of supplementation of CS with 0.1% BBG,XG,KGM and TSP on the hydrolysis of starch by 11.59%,35.90%,30.54% and 19.62%,respectively,and reduced the pGI value of starch by 12.05,45.54,38.90 and 15.00,respectively. In addition,with the increase of the apparent viscosities of soluble dietary fibers in the gastrointestinal system,the pGI values showed a decreasing trend,and the downward trends of pGI values became more gradual when the apparent viscosities of XG,KGM and TSP were more than 4 mPa·s.In conclusion,soluble dietary fibers could inhibit the digestion of CS,and their viscosities are important factors to reduce the postprandial glucose response. This study would lay a theoretical foundation for the applications of soluble dietary fibers in reducing the blood glucose level.

关 键 词：可溶性膳食纤维 玉米淀粉 黏度 体外消化 

分 类 号：TS255.1[轻工技术与工程—农产品加工及贮藏工程]