Add time:08/19/2019 Source:sciencedirect.com
Quinoa starch granules were esterified with dodecenyl Succinic anhydride (cas 108-30-5) (DDSA) to various degrees of substitution (DS) (0.0023 to 0.0095). Physicochemical properties and emulsification capacity of the modified starch were studied. Increasing DS increased the particle size, water solubility, and swelling power, while decreasing the gelatinization enthalpy change and relative crystallinity of the starch. The DDSA groups were suggested to be mostly located in the amorphous region of starch granules. With increasing DS, the viscosity and storage modulus (G') obtained from rheological analysis increased first and then decreased. The DDSA modified quinoa starch efficiently stabilized O/W Pickering emulsions and has some technical advantages compared to octenyl succinic anhydride-modified quinoa starch. Increasing DS led to decreased droplet size of the emulsions and a higher capacity in stabilizing emulsion during a period of 10 days. This study suggested the potential application of DDSA modified quinoa starch as an emulsifier in stabilizing Pickering emulsions.
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