Soybean dietary fiber is a complex mixture, which can be divided into two categories: water-soluble dietary fiber and water-insoluble dietary fiber according to its different solubility characteristics. The basic composition of soybean dietary fiber and dietary fiber from other sources such as wheat bran fiber and rice bran fiber are similar, but the relative content of each component, molecular glycosidic bond, degree of polymerization and branched chain structure are quite different, these factors determine Their physical and chemical properties affect their corresponding nutritional functional properties in the human body.
Soybean dietary fiber is composed of cellulose, hemicellulose, pectin and pectin-like substances, glycoprotein and lignin. The cellulose in soybean dietary fiber is a polymer connected by β-glucopyranose groups through β(1→4) glycosidic bonds. The soybean dietary fiber hemicellulose mainly includes four kinds of arabinoxylan, xyloglucan, galactomannan and β(1→3, 1→4)-glucan. Pectin is polygalacturonic acid linked by α (1→4) glycosidic bonds as the backbone chain, the main chain contains (1→2) rhamnose residues, and some galacturonic acid residues are often methylated .
Pectin substances are mainly composed of arabinan, galactan or arabinogalactan, among which arabinan is connected by furanoarabinose through (1→5) glycosidic bonds to form a main chain, sometimes through C2 or C3 Bit even has branches. The carbohydrate portion of the glycoprotein in soybean dietary fiber is arabinogalactan. Soybean lignin is a macromolecular compound composed of three monomers, pinaphanol, sinapyl alcohol and p-hydroxycinnamyl alcohol.
Specifically, soybean dietary fiber has the following health functions:
Dietary fiber enters the gastrointestinal tract like a sponge, absorbs water and swells into a gel, which increases the viscosity of food, delays the absorption of glucose in food, increases satiety, reduces sugar intake, and prevents a sharp rise in blood sugar ;
(2) Lowering fat.
Cholesterol is a fatty substance in the blood, which can increase the risk of coronary heart disease and stone disease. Dietary fiber can reduce intestinal absorption of cholesterol, promote bile excretion, lower cholesterol levels, and prevent coronary heart disease and stone disease. effect;
(3) lose weight.
Dietary fiber delays and limits the absorption of some sugars and lipids in the stomach, increases satiety, helps the body control diet, thereby reducing energy intake, so it helps to lose weight;
(4) Detoxification and beauty.
Dietary fiber can promote intestinal peristalsis, shorten the residence time of many poisons in the intestine, and reduce the retention and absorption of poisons in the intestine; Play the role of adsorption and dilution, reduce the impact of poison on the intestinal tract, and play the role of detoxification and beauty;
(5) Moisten the intestines and laxative.
Because dietary fiber can absorb water and expand, the volume of objects in the intestinal tract increases, making the stool loose and soft, promoting the reproduction of beneficial aerobic bacteria in the intestinal tract, reducing the production of spoilage bacteria, and can promote intestinal peristalsis and shorten the intestinal volume It can play the role of moisturizing the intestines and laxative;
(6) Enhance disease resistance.
Dietary fiber can increase the activity of phagocytic cells and enhance the immune function of the human body. Increasing the intake of dietary fiber is to avoid the “three highs” containing structure of high protein, high fat and high calorie, and prevent obesity, diabetes, hypertension and coronary heart disease , hyperlipidemia, tumors and other diseases of the rich and the rich are important measures.