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Effect of low temperature on the retrogradation behavior of rice gels with different milling degrees

Author:
Xia, Wen, Liu, Chengmei, Luo, Shunjing, Xu, Xingfeng, Fu, Guiming
Source:
Die Stärke = 2015 v.67 no.11-12 pp. 1044-1052
ISSN:
0038-9056
Subject:
Fourier transform infrared spectroscopy, X-ray diffraction, adhesion, crystal structure, differential scanning calorimetry, gels, hardness, industry, milling, retrogradation, rice, scanning electron microscopy, temperature, texture
Abstract:
The retrogradation properties of rice gels with different milling degrees (0, 3, 6, and 9%) stored at 4°C and −20°C were investigated. Results showed that rice gels with the same degrees of milling (DOM) stored at 4°C retrograde faster than those stored at −20°C. Moreover, higher milling degree leads to a faster retrogradation in the same temperature. Texture profile analysis demonstrated that samples showed a lower hardness but higher adhesiveness during storage at −20°C. Differential scanning calorimetry (DSC) revealed that the higher the milling degree, the higher retrogradation index (ΔHr/ΔHg) obtained at 4°C or −20°C. X‐Ray diffraction (XRD) analysis indicated that samples stored at −20°C had a lower degree of crystallinity compared with those stored at 4°C, which was also confirmed by Fourier Transform infrared spectroscopy (FTIR) analysis. Scanning electron microscopy (SEM) analysis showed that samples stored at −20°C presented a more shrinkable appearance with more pores. The results are expected to provide some theoretical guidance for retarding the retrogradation of rice in processing and preservation industry.
Agid:
4544544