Abstract: Soybean dietary fiber mainly refers to the general term for those macromolecular sugars in soybeans that cannot be digested by human digestive enzymes, mainly including cellulose, pectin, xylan, mannose, etc. Although dietary fiber does not provide any nutrients to the human body, it has an important role.

Keywords: Soy dietary fiber

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Mainly as follows:
1.Dietary fiber can delay the absorption of sugar, inhibit the rise of blood sugar, and reduce the secretion of insulin, which has a significant preventive effect on diabetes;

2.It can hinder the absorption of neutral fat and cholesterol, and significantly reduce the level of cholesterol in the blood. At the same time, dietary fiber can absorb sodium salts, so that the absorption in the intestinal tract is blocked, thereby reducing blood pressure;

3.Dietary fiber can promote intestinal peristalsis and prevent constipation and colon cancer;

4.The hydration of dietary fiber can enhance satiety, delay and reduce the absorption of nutrients in the small intestine, and can effectively prevent obesity.
Therefore, dietary fiber is recognized as the “seventh largest nutrient” by the medical and nutritional circles, and is an important food component for preventing “rich diseases” such as hypertension, coronary heart disease, and obesity.

Soybean dietary fiber is a complex mixture. According to its different solubility characteristics, it can be divided into two categories: water-soluble dietary fiber (Soluble Dietary Fiber, SDF) and water-insoluble dietary fiber (IDF). The basic composition of soybean dietary fiber and other sources of dietary fiber such as wheat bran fiber, rice bran fiber, etc. is similar, but the relative content of each component, molecular glycosidic bond, degree of polymerization and branch structure are very different, these factors determine Their physicochemical properties affect their corresponding nutritional functional properties in the human body.

Soybean dietary fiber is composed of cellulose, hemicellulose, pectin and pectin-like substances, glycoproteins and lignin. Cellulose in soybean dietary fiber is a polymer composed of β-glucopyranosyl groups linked by β(1→4) glycosidic bonds. The composition of soybean dietary fiber hemicellulose mainly includes arabinoxylan, xyloglucan, galactomannan and β(1→3, 1→4)-glucan.
Pectin is based on 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 methyl esterified. . Pectin-like substances are mainly composed of arabinan, galactan or arabinogalactan, among which arabinan is composed of arabinofuranoses connected to the main chain through (1→5) glycosidic bonds, sometimes through C2 or C3. Bits have branches. The carbohydrate portion of the glycoprotein in soybean dietary fiber is arabinogalactan. Soybean lignin is a macromolecular compound composed of pine alcohol, sinapyl alcohol and p-hydroxycinnamyl alcohol.