米糠粕不溶性膳食纤维理化性质及对高脂大鼠肠道菌群的影响  

Physicochemical Properties of Insoluble Dietary Fiber from Defatted Rice Bran and Its Effect on Intestinal Microbiota of High-Fat Diet Fed Rats

作　　者：刘倩 范誉川 刘素诗 赵洁羽 魏涛[1] LIU Qian;FAN Yuchuan;LIU Sushi;ZHAO Jieyu;WEI Tao(College of Biochemical Engineering,Beijing Union University,Beijing 100023,China;Beijing Key Laboratory of Bioactive Substances and Functional Foods,Beijing Union University,Beijing 100191,China)

机构地区：[1]北京联合大学生物化学工程学院,北京100023 [2]北京联合大学生物活性物质与功能食品北京市重点实验室,北京100191

出　　处：《食品科学》2021年第15期174-179,共6页Food Science

基　　金：北京联合大学人才强校优选计划项目(BPHR2019DZ05);北京市教育委员会科技计划一般项目(KM201811417003)。

摘　　要：米糠粕中膳食纤维含量丰富,可作为膳食纤维的良好来源。本实验利用多种酶对米糠粕进行处理,制备米糠粕不溶性膳食纤维(rice bran insoluble dietary fibers,RBIDF),并对其表面结构、常规成分和理化性质进行分析,此外建立高脂大鼠模型,研究RBIDF干预对高脂大鼠肠道菌群的影响。结果表明:制备的RBIDF中不溶性膳食纤维质量分数约为64%,与米糠粕相比,其表面结构更为疏松多孔,持水性和持油性有所提高;RBIDF具有良好的葡萄糖和胆固醇吸附能力,对其吸附量最高分别为6.4 mg/g和12.8 mg/g;此外,RBIDF表现出一定的抗氧化能力,能够有效清除羟自由基和1,1-二苯基-2-三硝基苯肼自由基;RBIDF干预能够在一定程度上改善高脂膳食造成的肠道微生物数量和组成变化,调节肠道菌群平衡。综上,RBIDF在体内和体外都具有良好的活性,本研究为其开发利用提供了一定的理论依据。Defatted rice bran is rich in dietary fiber and can be considered a good source of dietary fiber.In this study,rice bran insoluble dietary fiber(RBIDF)was obtained from defatted rice bran by sequential enzymatic treatment and evaluated for surface structure,composition and physicochemical properties.In addition,the effects of intervention with RBIDF on the intestinal microbiota of high-fat diet fed rats were investigated in detail.The composition analysis showed that the content of insoluble diet fiber in RBIDF was approximately 64%,and its surface structure was more loose and porous than that of defatted rice bran.RBIDF possessed improved water/oil-holding capacity and good adsorption capacity for glucose and cholesterol,reaching up to approximately 6.4 and 12.8 mg/g,respectively.RBIDF also exhibited excellent antioxidant properties by scavenging hydroxyl and 1,1-diphenyl-2-picrylhydrazyl(DPPH)free radicals.Intragastric administration of RBIDF could improve changes in the population and composition of gut microbiota caused by high-fat diet,regulating the intestinal microbiota balance.The results suggested that the RBIDF from defatted rice bran presented excellent bioactivity both in vitro and in vivo.This study could provide a theoretical basis for the development and utilization of RBIDF.

关 键 词：米糠粕 不溶性膳食纤维 理化性质 肠道菌群 

分 类 号：TS218[轻工技术与工程—粮食、油脂及植物蛋白工程]