STUDY ON QUALITY CHANGE OF SOYBEAN OIL UNDER CONTROLLED ATMOSPHERE STORAGE WITH N_2

The paper studied the influences of controlled atmosphere storage with N_2 on the quality of soybean oil.The effects of moisture content and storage temperature on the acid value and peroxide value of soybean oil were compared under controlled atmosphere storage with N_2 concentration of 98%,90%and 78%.The results showed that the storage temperature was the most important factor influencing the acid value of the soybean oil; and the moisture content was the most important factor influencing the peroxide value stability of the soybean oil. Under the conditions of same N_2 content,higher storage temperature and higher moisture content resulted in more increase of the acid value and the peroxide value of the soybean oil.The acid value of high-moisture(14.9%) soybean stored under controlled atmosphere N_2(98%) at 30℃for 180 days was smaller than that of the contrast group by 20.2%;and the peroxide value of low-moisture(12.2%) soybean stored under controlled atmosphere N_2 (98%) at 30℃for 180 days was smaller than that of the contrast group by 26.1%.Accordingly,the controlled atmosphere storage with N_2 could delay the increase of the acid value and peroxide value of the soybean oil to a certain extent.