| Using PLA1 to remove phospholipid from crude soybean oil,then residual phosphorus and soap in soybean oil were removed by silica gel adsorption. Taking the phosphorus content after enzymatic degumming, the phosphorus content and soap content after silica gel adsorption as evaluation indicators, the effects of enzymatic degumming and the adsorption of silica gel were studied.The results showed that under the degumming conditions of soybean oil pH 5.5-6, dosage of deionized water 3% and reaction time 6-8 h, the effect of enzymatic degumming increased with the increase of dosage of PLA1.When the dosages of PLA1 were 50,75 mg/kg and 100 mg/kg,the phosphorus content in degummed soybean oil decreased from 566.36,538.02,562.76 mg/kg to 44.67,18.99,17.01 mg/kg, respectively. Then adding 0.1% of SORBSIL R92 silica gel, phosphorus content in soybean oil decreased to 41.21,16.35,15.42 mg/kg, and soap content decreased from 37,23,14 mg/kg to 14,8,5 mg/kg, respectively.After enzymatic degumming, the acid value and peroxide value of soybean oil increased,and the acid value of three oil samples increased by 0.63 mgKOH/g on average, and the peroxide value increased by 0.007 g/100 g on average. The acid value and peroxide value of soybean oil increased after the adsorption of silica gel. |
