食品科学 ›› 2004, Vol. 25 ›› Issue (9): 67-70.

• 基础研究 • 上一篇    下一篇

不同pH下阿魏酸对大豆分离蛋白膜性能的影响

 包惠燕, 郭乾初, 欧仕益, 李爱军, 杨爱华   

  1. 暨南大学食品科学与工程系,香港理工大学应用生物与化学科技系
  • 出版日期:2004-09-15 发布日期:2011-10-24

The Effect of pH and Ferulic Acid on Selected Properties of Soy Protein Isolate Films

 BAO  Hui-Yan, GUO  Qian-Chu, OU Shi-Yi , LI  Ai-Jun, YANG  Ai-Hua   

  1. 1.Department of Food Science and Engineering, Jinan University;2.Departmentof Applied Biology and Chemical Technology, The Hong Kong Polytechnic University
  • Online:2004-09-15 Published:2011-10-24

摘要: 本文报道了阿魏酸、pH及碱液等对大豆分离膜的的影响。以大豆分离蛋白为主要基质的成膜溶液调pH、热处理后铺板干燥,揭膜,在相对湿度为52%的室温环境下平衡48h后测定膜的抗拉强度、断裂伸长率、水蒸气透性、颜色等。结果表明,大豆蛋白膜的断裂伸长率随pH的升高而增加,抗拉强度在中性pH以上时也是随pH升高而增加;阿魏酸的添加可显著增加膜的拉伸张力和断裂伸长率,但也使膜的颜色变深;阿魏酸还使我们可以在成膜溶液pH为中性时制备具有较强抗拉强度的膜:加阿魏酸100、200、300mg( 此用量分别相当于大豆分离蛋白的2%、4%、6%)将成膜溶液pH调为7.0,与对照相比,可使断裂伸长率提高24.2%~54.4%,抗拉强度提高62.5%~94.3%。

关键词: 大豆分离蛋白(SPI), 阿魏酸, 膜, 机械特性, 水蒸气透性(WVP), 颜色

Abstract: This study was conducted to determine the effect of ferulic acid on selected properties of glycerol-plasticized soyprotein isolate (SPI) films. Films were plate casted from heated (80℃ for 30 min) neutral or alkaline aqueous solutions of SPI(5g/100 ml water) , glycerol (2.5g), and ferulic acid (0, 100, 200, 300mg), and dried in an oven at 50℃. Tensile strength (TS),percent of elongation at break (E) , color values ( L, a, and b) , and water vapor permeability (WVP) were examined afterconditioning film specimens at 25℃ and 52% relative humidity (RH) for 2d. The use of ferulic acid resulted in the increase inboth E and TS to different extents at different pHs. The addition of ferulic acid made it possible to prepare SPI films from neutralfilm-forming solutions: compared with control films without ferulic acid, the addition of 100~300mg ferulic acid resulted in anincrease of TS from 62.5% to 94.3%, and an increase of E from 24.2% to 54.4%. Increased darkness, redness and yellowness asevidenced by smaller L values and greater +a and +b values were noted for films with high amounts of ferulic acid. Nodistinguished positive effect of ferulic acid on the WVP of the films was found.

Key words: soy protein isolate (SPI), ferulic acid, film, mechanical properties, water vapor permeability (WVP), colour