A Study On Extraction Of Pecan Oil By Composite Enzyme Method And Comprehensive Utilization Of By-Products

[Objective]Hickory is a pure natural green food, nutrients are abundant, with a high nutritional value, with ease fatigue, improve memory, aging and so on. Walnut oil is the main product when the walnut as the oil. Walnut oil can improve the digestive system function, protect bones, prevent cancer, radiation protection, prevention of cardiovascular and cerebrovascular diseases. Discuss the process conditions of extraction of pecan oil by Composite enzyme method, and hydrosis its by-product of protein into peptides, and further processing by the micro-capsules, as a food, not only help the body to absorb, but also has health benefits. To provide a feasible path for the pecan processing utilization, reduce the cost of industrial production.[Methods] Use s Changbai Mountain pecialty Wild pecan as the raw materials, after extraction walnut oil through Composite enzyme method, use Ultrasonic to assiste extraction of alkaline extraction and acid precipitation and separated proteins, And further through the hydrolysis to prepare walnuts peptide, Finally, prepare walnut peptide microcapsules by spray drying.[Result] Determine Walnut oil extraction process parameters by the single factor experiments and orthogonal test. Specifically: the best type of enzyme was the composite enzyme of Neutral protease and a amylase (1:1 ratio), optimum amount of enzyme was 1.5%, the ratio of material and Water was 1:7, hydrolysis pH 6.4, hydrolysis temperature was 47℃, hydrolysis time was 150min. Under this condition, walnut oil extraction rate up to 82.13%.Identified Walnut proteins Alkaline extraction process parameters, solid to liquid ratio was 1:30, alkaline pH 8.5,Extraction temperature was 55℃. Under these conditions, Defatted walnut meal protein extraction rate was 71.28 percent. Identified the best pH range of Acid precipitation Preparation of walnut proteins, Select the range of acid precipitation optimum pH was 4.5-5.0. Walnut peptide microcapsules wall material is gum arabic,β-cyclodextrin and maltodextrin, the use was 1:3:2. Core material and wall material ratio was 1:5, Under these conditions, the highest yield of microcapsules was 83.7%. The process conditions of Spray-dried production walnut peptide was:Inlet temperature 200℃, inlet air flow 120m3/h, outlet temperature 110℃, feed concentration24%, the moisture content7.0%, the finished microcapsules was 84%.[Conclusion] The process conditions of the binding between complex enzymatic extraction and Aqueous extraction of pecan oil was relatively mild. Oil yield and quality are high. Ultrasonic assistance alkaline extraction and acid precipitation method were angular seeds protein, and its color wa good, Maximizly protect the natural protein structure, Protein had high purity. The yield through high spray drying preparation microencapsulation of walnut peptide was high. Low cost, marketing value of micro-capsules was very high. Provides a theoretical basis for The development and utilization of Changbai Mountain Hickory and the industrial production of angle pumpkin seed protein drink.