FOOD SCIENCE ›› 2017, Vol. 38 ›› Issue (23): 100-105.doi: 10.7506/spkx1002-6630-201723017

• Basic Research • Previous Articles     Next Articles

Retrogradation Kinetics and Glass Transition Temperature of Wheat Starch

ZHAO Kai, LI Jun, LIU Ning, CHEN Fenglian, FU Dawei   

  1. Key Laboratory for Food Science and Engineering, Harbin University of Commerce, Harbin 150076, China
  • Online:2017-12-15 Published:2017-12-07

Abstract: The effects of storage temperature and time on the retrogradation kinetics and Tg’ (glass transition temperature of the maximally freeze-concentrated state) of different wheat starches (normal wheat starch, wheat A-starch, and wheat B-starch) were studied by differential scanning calorimetry (DSC). Fully gelatinized wheat starches were stored at ?18, ?5, 4 and 22 ℃ for 3–21 d respectively; retrogradation degree (RD), Tg’ and unfrozen water content of wheat starches were determined. The results showed that no retrogradation occurred for wheat starches stored at ?18 ℃. The RD of wheat starch stored at 4 ℃ was greater than at ?5, and 22 ℃. As indicated by DSC analysis, the Tg’ of wheat B-starch was higher than that of wheat A-starch. The results revealed that there was a significant difference in retrogradation kinetics between A- and B-starch with the former having a greater RD. The unfrozen water content had a great impact on the Tg’ of wheat starch.

Key words: wheat starch, retrogradation kinetics, differential scanning calorimetry, glass transition temperature, storage stability

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