Study On The Preparation And Modification Of Dietary Fiber From Wild Hazelnut In Changbai Mountain

Hazelnut,also famous mountain chestnut,chestnut,or seed,in the hazelnut in addition to protein,fat,sugar,carotene,vitamin and seventhnutrients-dietary fiber content is very rich;hazelnut meal is a by-product of hazelnut oil after hazelnut oil,and after hazelnut oil is about to produce 30~40%hazelnut meal,the traditional hazelnut meal is the main.It is not used effectively for feed and fertilizer.Dietary fiber is a kind of non starch polysaccharide,which is made up of cellulose,lignin,pectin,beta glucan and oligosaccharide.It can improve the nutritional status of human body,regulate the function of the body and reduce the incidence of many chronic diseases.It is necessary to maintain the life and health of the human body.In this experiment,the nutritional components of hazelnut in Changbai Mountain were analyzed and the total dietary fiber was prepared from hazelnut seed oil after the hazelnut oil extraction.Then the insoluble dietary fiber was modified into soluble dietary fiber by xylanase.Finally,the properties of defatted hazelnut,total dietary fiber,modified dietary fiber and water-soluble dietary fiber were compared.Chemical properties.The results of the test are as follows:(1)To determine the nutritional components of Changbai Mountain hazelnut and prepare dietary fiber according to the national standard,and to optimize the preparation conditions of the dietary fiber of the defatted hazelnut powder by response surface method,and determine the optimum preparation conditions for the dietary fiber of hazelnut kernel.The results show that:The content of protein,fat,moisture,ash and dietary fiber in Changbai Mountain hazelnut are 19.92%,43.09%,5.33%,2.43%and 23.04%,respectively.The best technological conditions for the preparation of dietary fiber are:enzyme dosage 6.91%,enzymolysis temperature 46,and enzymolysis time 2.2 h,under this condition,the yield of dietary fiber reaches 79.36%.(2)Using insoluble dietary fiber in hazelnut seed meal as raw material,the optimum conditions for modifying the dietary fiber of hazelnut seed meal were determined by enzyme method.On the basis of single factor test,the content of xylanase,enzyme hydrolysis pH and enzymolysis temperature were selected as independent variables.The yield of soluble dietary fiber after modification was the response value,and the response surface method was used to optimize the diet.The technological conditions for the modification of food fiber.The results show that:The optimum technological conditions for the modification of dietary fiber were xylanase addition of 5052 U/g,enzymatic hydrolysis of pH 6.35 and enzymatic hydrolysis temperature of 58.3 C.Under these conditions,the yield of soluble dietary fiber after modification was 31.06%.(3)The swelling power,solubility,oil holding property,water holding property and cation exchange ability of the four samples were determined respectively.The swelling power of the modified dietary fiber was 6.93 mL/g,and the dissolubility of the defatted hazelnut powder was 17.6%higher than that of the total dietary fiber.The water holding and oil holding properties of the modified dietary fiber were the highest,6.53 g/g and 3.23g/g respectively,and the cation exchange ability of the hazelnut total dietary fiber was 0.04 mmol/g higher than that of the defatted hazelnut powder.