关键词: 大豆磷脂, 聚乙二醇单甲醚2000, 改性, 临界胶束浓度, 性能

Abstract: With soybean phospholipid as raw material,first it was converted into sodium soy phospholipids and then reacted with monomethoxypolyethylene glycol 2000 tosylate (mPEG₂₀₀₀-OTs) to prepare soybean phosphatidyl methoxy polyethylene glycol 2000 ester(SP-mPEG₂₀₀₀). The experimental results were as follows:soybean phospholipid was reacted with 65mg NaH to obtain sodium soy phospholipids,m(sodium soy phospholipids):m(mPEG₂₀₀₀-OTs)=0.45:1,reaction time was 4 hours,reaction temperature was 90℃,and the conversion rate was 71.2%. The solid product is pale yellow color. Analyzed by ¹HNMR and IR,the product was proved to be SP-mPEG₂₀₀₀. This method has the characteristics of mild reaction condition and high utilization of soybean phospholipid. The critical micelle concentration of SP-mPEG₂₀₀₀ is 0.5g/L with surface tension of 42mN/m,The kinetic stability of SP-mPEG₂₀₀₀ was confirmed by emulsifying power of n-hexane and water,which indicated that kinetic stability of the product is superior to soybean phospholipid powder.

Key words: soybean phospholipids, methoxy polyethylene glycol 2000, modification, critical micelle concentration, properties