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Published on: June 28, 2019
Agar quality promotion prepared by desulfation with hydrogen peroxide
Qiong Xiao1, Ding An2, Cong Zhang2
1College of Food and Biological Engineering, Jimei University, Xiamen 361021, China; National R&D Center for Red Alga Processing Technology, Xiamen, Fujian Province 361021, China; Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Xiamen, Fujian Province 361021, China.
Abstract:
The modified agars were prepared using H2O2 in ethanol solution at appropriate pH conditions. Some interesting physical and chemical properties of modified agar were determined and characterized compared with those of raw agar, and the underlying mechanisms were preliminarily studied. Results showed that the maximum gel strength of the modified agar was 1068 g/cm2, which increased by 30.9% compared with that of raw agar (816 g/cm2), and the minimum sulfate content of the modified agar was 0.21%, which decreased by 73.4% compared with that of raw agar (0.79%). Moreover, the viscosity, molecular weight, gelling temperature and melting temperature all decreased, whereas the whiteness and transparency increased after modification. Fourier transform infrared spectroscopy, scanning electron microscopy and thermogravimetric analysis indicated that the spatial structure of agar have changed after treated with H2O2. Taken together, the results demonstrated that the desulfation of agar with H2O2 is a promising approach with practical significance.
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