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Dietary fiber is a mixture of ingredients that contains cellulose, hemicellulose, lignin, pectin and soluble polysaccharide as an extremely important function of food, causing great concern of nutritionists at home and abroad, more and more attention in the development of functional foods. Lotus root and lotus slag rich in dietary fiber components, has not been very good development and utilization. In this paper, lotus root residue as raw material dietary fiber, and to study the physical and chemical properties and functional activity to find a new way to, lotus root slag comprehensive utilization, achieve the increase in the value of the products of lotus root, improve economic benefits lotus root, reduce waste and environmental pollution purposes. The results are as follows: the water alcohol prepared by precipitation method SDF optimum conditions: the solid-liquid ratio 1:15, water extraction temperature to 80 ° C, water extraction for 90 minutes. Prepared by acid hydrolysis SDF, the best conditions: citric acid solution, solid-liquid ratio 1:12, pH value 2.0,80 ℃ extraction 90min. The orthogonal results show that: water extraction temperature 80 ° C, pH 1.5 acid solution for 90 minutes, the solid-liquid ratio 1:20, the LR-SDF extract the highest rate of 24%. Using alkali combined protease hydrolyzed prepared by IDF, the best experimental conditions: lye concentration of 5%, the alkaline extraction temperature of 70 ° C, the alkali extraction time 90min, alkali extraction and better; enzyme dosage 0.3 %, reaction temperature is 40 ℃, hydrolysis time is 90min, enzymatic better, insoluble dietary fiber yield can reach 26%. LR-IDF of swelling with 3.67 ml / g, and the water holding capacity of 384.7%. 3 selection of NaClO as bleaching agents, the concentration of 7%, bleaching time 1h, a bleaching temperature 20 ° C the best. 4 to the intake of food utilization factor, intestinal propulsion rate of the evaluation index, the digestive function of the mice was evaluated, the results showed that: a high concentration of dietary fiber can significantly increase the food intake and body weight of the mice, and thus can significantly increase the small advance rate of the rat small intestine. Normal mice fasting blood glucose, alloxan-induced hyperglycemic mice blood glucose value evaluation index regulate blood sugar function evaluation, mice, experimental results show that dietary fiber can prevent diabetes, treatment consists of four oxygen pyrimidine-induced diabetes, improve glucose tolerance of alloxan-induced diabetic mice. Body weight gain, serum total cholesterol (TC), triglyceride (TG), high density lipoprotein (HDL-C) as the evaluation index, the mice lipid-lowering function evaluation. And high concentrations of DF can significantly reduce total cholesterol of mice, the value of triglycerides and LDL-C content.
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