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Structure and physicochemical properties of rice starch modified with dodecenyl succinic anhydride and its use for
Huiying Li1, Huijing Chen1, Zao Shi1
1College of Food Science, Southwest University, 2 Tiansheng Road, Beibei, Chongqing 400715, PR China.
Abstract:
Polysaccharides are used as wall materials to extend the shelf life of lactic acid bacteria. Ice crystal formation during freezing leads to probiotic death. We prepared a series of dodecenyl succinic anhydride (DDSA)-modified rice starches with varying degrees of substitution and compared their functional properties. Fourier-transform infrared spectroscopy, X-ray diffraction analysis, and nuclear magnetic resonance results confirmed successful DDSA modification and the disruption of the long-range ordering of starch molecules. The structural changes modified the physicochemical properties of starch. For example, the apparent viscosity and viscoelastic characteristics of modified rice starch increased, and its freeze-thaw stability and emulsion capacity were remarkably improved after DDSA modification. Moreover, the modified starches exhibited promising performance for microencapsulating Pediococcus acidilactici. This study describes a rice starch derivative with excellent physicochemical properties that can be used to enhance the storage stability of bioactive probiotics.
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