The Research Of L-Arabinose Extracting From Cornbran By Acid Hydrolysis

Corn husk is corn processing production process of by-products. According to the statistics, every year in China for the production of corn starch corn, more than15million tons, the by-products corn husk production in the100-1.5million tons, and the sources of the raw materials concentration, to be convenient for the subsequent large-scale industrialization process. Corn starch production process, corn after soaking, broken and so on the working procedure of corn in separate epidermis doping have protein, starch and, therefore, mainly for the production of feed. In present the corn husk comprehensive utilization level is low, produce economic benefits, potentially less of the waste of resources. And corn husk contains abundant L-Arab xylan, its extraction into L-Arab sugar, can not only realize waste utilization, and can produce considerable economic benefits.L-Arab sugar as a low-calorie sweetener, has been the United States food and drug administration and the health ministry approval in health food additive. L-Arab sugar the most representative physiological function is a selective impact on small intestinal disaccharide sucrose hydrolysis enzyme digestion of sucrase, thus inhibiting the absorption of sugar. According to the report, adding2%L-Arab sugar, can inhibit the absorption of sugar40%, at the same time also inhibit blood glucose value less increase about50%; If L-Arab sugar adding amount to4%, can make blood glucose value not rise, the inhibition of insulin secretion is the same. Therefore, L-Arab sugar is a kind of no heat of natural and synthetic sweetener, can restrain obesity, prevention and treatment of diabetes and high blood glucose, and other related diseases.This paper through the study of corn husk acid solution, the hydrolysate of purification, using simulated moving bed realize the L-Arab sugar, xylose separation etc. The topic, and ultimately the L-Arab sugar crystal and xylose crystal.Through the experimental demonstration, the best conditions of pretreatment for: with concentration of0.1%NaOH solution and corn husk according to the proportion of "mixed in125℃, cooking2.5h;The best hydrolysis conditions for:with concentration of2%oxalic acid solution and corn husk according to the proportion of "mixed in120℃,2h hydrolysis.The best process conditions and steps for:and the end for pH3.3, calcium carbonate water turbidity liquid concentration20%, calcium carbonate water turbidity liquid low rate is0.2g/min, heat preservation time sixty min, stirring intensity for slow stirring;Purification steps process design for:a decolorizing-a cation exchange-an anion exchange-second cation exchange-a concentrated, removing impurity and secondary decolorizing-three cation exchange-secondary anion exchange-secondary enrichment-three decolorization. After purification feed liquid index:refraction50.4%, pervious to light99.80%, conductivity0.067ms/cm, acidity0.004%, reducing sugar content49.6%, L-Arab sugar purity57.45%, xylose purity24.93%;Chromatographic separation:using the separation resin and single column evaluation unit test L-Arab sugar and xylose separation degree R value is greater than1.52, the complete separation required R value1.5, then choose chromatographic resin can be completely separate L-Arab sugar and xylose.