摘要
利用动态光散射技术,研究了大豆分离蛋白及其与丙烯酸接枝共聚物在水相体系中对pH值的响应性。结果发现,大豆分离蛋白和接枝产物对水相pH值都具有很高的响应性。大豆分离蛋白平均流体力学半径〈Rh〉在等电点附近(pH=4~5)达到最大值。接枝率为27.5%的丙烯酸的接枝共聚物的平均流体力学半径〈Rn〉在pH为2~3范围内最大。随着接枝率增加,丙烯酸的接枝共聚物在水相体系中的溶解性能越好。对接枝产物不同pH值水溶液进行研究具有很大的理论指导意义。
In this paper,the effect of pH value on the solution behavior of soybean protein isolate (SPI) and its grafted copolymer with acrylic acid (SPI-g-PAA) was investigated by dynamic light scattering (DLS). The results indicated that the radius of SPI and SPI-g-PAA aggregates was related to the pH values. The average hydrodynamic radius of SPI aggregate had the maximum value at its isoelectric point (pH =4~5). The average hydrodynamic radius of SPI-g-PAA aggregates with the 27.5% grafting rate had the maximum at pH = 2 ~ 3. The solubility of the SPI-g-PAA in aqueous solution increased with increasing of the grafting rate.
出处
《应用化工》
CAS
CSCD
2008年第8期869-872,共4页
Applied Chemical Industry
基金
山东省自然科学基金(Y2001F12)
山东省教育厅科技发展计划项目(J04A16)
关键词
大豆分离蛋白
接枝共聚
丙烯酸
动态光散射
soybean protein isolate
copolymerization
acrylic acid
dynamic light scattering