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The gelatinization and retrogradation properties of wheat starch with the addition of stearic acid and sodium alginate

Author:
Yu, Zhen, Wang, Yu-Sheng, Chen, Hai-Hua, Li, Qian-Qian, Wang, Qi
Source:
Food hydrocolloids 2018 v.81 pp. 77-86
ISSN:
0268-005X
Subject:
crystal structure, differential scanning calorimetry, enthalpy, firmness, gelatinization, gels, hydrocolloids, retrogradation, sodium alginate, stearic acid, temperature, wheat starch
Abstract:
The gelatinization and retrogradation properties of wheat starch (WS) with the addition of the combination of stearic acid and sodium alginate (C-SA-AG) were investigated in this study. The results of differential scanning calorimetry (DSC) showed that C-SA-AG significantly increased the gelatinization onset temperature of WS by 2.6–3.4 °C, whereas decreased the gelatinization enthalpy of WS by 5.7–6.7 J/g. This suggested that C-SA-AG could obviously delay the gelatinization process of WS. The gel firmness, retrogradation enthalpy, the ratio of intensity at the band of 1047 cm−1 to 1022 cm−1 (R1047/1022), and the relative crystallinity (RC) of WS were significantly decreased with the addition of C-SA-AG by 322–346 g, 0.51–1.78 J/g, 0.06–0.12, and 7.12–9.05% after stored for 7 days at 4 °C, respectively. However, the loss factor (tanδt/tanδ0) was increased by 0.49–0.54 after sweeping for 120 min. This suggested that C-SA-AG could effectively retard the retrogradation of WS. During storage, the retrograded WS containing SA showed V-type crystal structure, which lost the A-type crystal structure of native WS.
Agid:
5923315