FOOD SCIENCE ›› 2005, Vol. 26 ›› Issue (11): 42-46.

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Functional Properties and Structure of Tomato Seed Protein

 SHEN  Xin-Yu, XU  Shi-Ying, WANG  Zhang   

  1. Department of Food Science and Technology, Southern Yangtze University
  • Online:2005-11-15 Published:2011-10-01

Abstract: The maximum NSI of tomato seed protein (TSP) was 30.02% at 50℃ in a 5%(W/V) water solution. The determination of functional properties of soluble tomato seed protein showed that the emulsifying capacity and stability of the soluble tomato seed protein were increased as the temperature rose from 30℃ to 50℃, and decreased when reaching 60℃. Compared with soy isolate protein, tomato seed protein had better foaming capacity but worse foam stability. The amino acid composition of tomato seed protein indicated that it could be used as a promising source for supplementation of low lysine foods. SDS-PAGE electrophoresis revealed that the water and salt fraction of tomato seed protein exhibited three bands each (39.2, 30.1 and 15.8kDa, 66.1, 28.1 and 16.8kDa, respectively), while alcohol soluble protein showed two bands (30.3 and 17.8kDa).

Key words: tomato seed protein, NSI(nitrogen solubility index), emulsifying capacity, foaming capacity, SDS-PAGE