Study on refining process of cold pressed method for walnut oil and its effective composition
WANG Dingding1, ZHANG Runguang1, WANG Xiaoji2, FENG Binkui3, ZHANG Youlin1*
(1 School of Food Engineering and Nutritional Science, Shaanxi Normal University,Xi′an 710119, Shaanxi, China;2 Forestry Technology Promotion Center of Xi′an, Xi′an 710061, Shaanxi, China;3 Shaanxi Datong Ecological Industry Development Limited Company, Xi′an 710065, Shaanxi, China)
Abstract:
The refining process of cold pressed method for walnut oil is studied, and the optimal reaction conditions are determined. The conditions of degumming are stirring speed 60 r/min, add water 3% and temperature 60℃, the conditions of disacidification are alkali refining temperature 55 ℃, lye concentration 10% and stirring speed 50 r/min, the conditions of decoloration are attapulgite 1%, temperature 65 ℃ and stirring speed 55 r/min, the conditions of drying are vacuum degree 0.09 MPa, temperature 85 ℃ and time 30 min. The yield efficiency of walnut refined oil can reach 85.1% under these conditions. The quality of walnut oil can reach the national standard. The content of unsaturated fatty acids reached 92.7% and vitamin E was 28.4 mg/100 g.
KeyWords:
cold pressed; walnut oil; refining; unsaturated fatty acid; vitamin E(VE)
