MTGase聚合大豆蛋白及其改性机理 （II）MTGase聚合改性大豆蛋白研究

研究了微生物转谷氨酰胺酶(MTGase)聚合作用对大豆酸沉蛋白(SAPP)的溶解性能、乳化及起泡性能、凝胶性以及持水性能等功能特性的影响。结果显示：1)显著地提高了SAPP对pH的稳定性，MTGase催化SAPP(1％)聚合4h可获得较好的pH稳定性，然而降低了sAPP的溶解性能(除等电点附近有点增加之外)；2)降低了SAPP的乳化能力，然而其乳化稳定性稍有增加；3)对sAPP的起泡能力影响不大，然而可显著地改善泡沫稳定性。SAPP经MTGase聚合2h的样品泡沫稳定性最佳；4)显著地提高SAPP的凝胶性能；5)DSC分析结果表明。MTGase显著地提高SAPP的热变性温度，或者显著地改善SAPP的水化性能：

Polymerization of Soybean Proteins and Its Modification Mechanisms by MTGase (II) Study on Polymerization Modification of Soybean Proteins by MTGase

The effects of polymerization by microbial tranglutaminase (MTGase) on functionalities of soybean acid-precipitated proteins (SAPP), such as solubility, emulsifying and foaming properties, and water-holding properties were investigated. It was indicated by the results as follows: 1) The pH-stability of SAPP was remarkably improved by polymerization, and the optimal pH-stability was obtained when the SAPP (1%) was polymerized by MTGase for 4h, but the solubility of SAPP declined (except at near isoelectric point). 2) The emulsifying capacity of SAPP was reduced, while its emulsifying stability increased slightly. 3) The foaming capacity of SAPP was almost not affected by MTGase, but the foam stability was improved observably, and the optimal foam stability was obtained when SAPP was polymerized by MTGase for 2h. 4) The gel-forming property of SAPP was improved remarkably. 5) The results of DSC indicated that the thermal temperature of SAPP was improved, or the water-holding property was improved remarkably.