刺梨果渣膳食纤维的体外吸附性能

Adsorption Capacity of Dietary Fibers from Roxburgh Rose Pomace in vitro

以发酵法制备的刺梨果渣膳食纤维为材料,模拟人体胃和肠道的p H值环境,探讨刺梨果渣可溶性和不可溶性膳食纤维对油脂、胆固醇、胆酸钠、亚硝酸盐和葡萄糖的吸附能力,为刺梨果渣膳食纤维产品的研发提供依据。结果表明,刺梨果渣及其膳食纤维对猪油的吸附量均高于花生油,其中膳食纤维的吸附量显著高于果渣(p<0.05)。刺梨果渣膳食纤维对胆固醇和NO_2^-的吸附效果与p H值有关,不可溶膳食纤维对胆固醇的吸附能力在模拟肠道条件下强于可溶性膳食纤维(p<0.05),在模拟胃环境下对胆固醇的吸附能力则不如可溶性膳食纤维(p<0.05);两种膳食纤维对NO_2^-的吸附量均是模拟胃环境下高于模拟肠道环境的吸附能力(p<0.05),但两种纤维之间的吸附能力差异不显著。而对于葡萄糖的吸附能力,刺梨果渣可溶性膳食纤维优于不可溶膳食纤维。试验说明刺梨果渣膳食纤维具有清除胆固醇、抑制膳食中脂肪的吸收和利用,还减少亚硝酸盐的吸收,可作为一种较为优质的膳食纤维资源。

An in vitro study was carried out to test adsorption capacity of soluble dietary fibers （SDF）andinsoluble dietary fibers（IDF）from roxburgh rose pomace for fat,cholesterol,glucose,NO2-and bile acid. Theresults showed that the adsorption capacity of dietary fibers for lard was better than peanut oil,and dietary fiberhad the higher absorption than roxburgh rose pomace （p〈0.05） . The adsorption capacity of roxburgh rose pomacedietary fiber on cholesterol and NO2-was related with pH in vitro. The average adsorption capacity of IDF oncholesterol was higher than SDF under simulating small intestine （p 〈0.05）,and lower than SDF undersimulating the stomach （p 〈0.05）;the average adsorption capacity on NO2-under the stomach pH wassignificantly higher than that under the intestine pH（p〈0.05）,and the adsorption capacity was not significantdifference between SDF and IDF. SDF had the higher absorption for glucose than IDF. It was indicated thatdietary fibers had obvious adsorption and elimination activity on cholesterol,fat and NO2-,these propertiesshowed that dietary fibers from roxburgh rose pomace is a high-quality resource of dietary fiber.