豆渣膳食纤维的体外吸附性能

以大豆豆渣为原料，提取得到可溶性膳食纤维（soluble dietary fiber， SDF）、不溶性膳食纤维（insolubledietary fiber，IDF）、果胶、半纤维素A（hemicellulose A，HCA）和半纤维B（hemicellulose B，HCB），分别研究其对葡萄糖、丙烯酰胺、NO2－及重金属的体外吸附能力。结果表明：膳食纤维的吸附能力与膳食纤维的种类、被吸附物的种类以及溶液的pH值等多种因素有关。豆渣膳食纤维中可溶性组分（SDF、HCB、果胶）的吸附能力较不溶性组分（IDF、HCA）强；豆渣膳食纤维对葡萄糖、NO2－、重金属有较强的吸附能力，但吸附丙烯酰胺的能力较弱；豆渣膳食纤维对NO2－、丙烯酰胺等物质在胃中（pH 2）的吸附能力大于在肠道中（pH 7）的吸附能力，而对重金属阳离子的吸附能力则在肠道中更强。

in vitro Adsorption Capacity of Dietary Fibers from Soybean Dregs

Five kinds of dietary fibers from soybean dregs, including water-soluble dietary fiber (SDF), water-insolubledietary fiber (IDF), pectin, hemicellulose A (HCA) and hemicellulose B (HCB) were used to explore their in vitro adsorptioncapacity for glucose, acrylamide, NO2－ and heavy metals, respectively. The results showed that the adsorption capacitywas highly related to dietary fiber type, adsorbate type and pH. Compared to insoluble constituents (IDF and HCA),the soluble ones (SDF, pectin and HCB) had stronger adsorption capacity for glucose, acrylamide, NO2－ and heavymetals such as Pb, Cu, Cd and Zn. As for adsorbate type, soybean dietary fibers adsorbed more glucose, NO2－ andheavy metals than acrylamide. The adsorption capacity of soybean dietary fibers for NO2－ and acrylamide was better insimulated stomach fluid (pH 2) than in simulated small intestine fluid (pH 7), while heavy metals was adsorbed betterin simulated small intestine fluid.