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Published on: December 27, 2013
Effects of amylose and amylopectin molecular structures on the emulsification performance of starch nanoparticles
Songnan Li1, Zihan Wang2, Yujun Pan2
1Joint International Research Laboratory of Agriculture and Agri-Product Safety, Institutes of Agricultural Science and Technology Development, Yangzhou University, Yangzhou, Jiangsu 225009, China; Laboratory of Crop Genomics and Molecular Breeding/Key Laboratory of Plant Functional Genomics of the Ministry of Education/ Jiangsu Key Laboratory of Crop Genetics and Physiology, Agri-cultural College of Yangzhou University, Yangzhou 225009, China; Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou 225009, China.
Abstract:
Starch nanoparticles have increasing applications as emulsion stabilizers in functional foods and drug delivery. The effects of amylose and amylopectin molecular structures on the emulsification performance of starch nanoparticles obtained from anti-solvent precipitation are explored here. From size-exclusion chromatography results, ten different starch nanoparticles with distinct molecular structures possessed a molecular size ranging from 63 nm to 111 nm. Rice-starch nanoparticles showed near-neutral wettability (contact angle 90.25°) with 100 % emulsifying stability index (ESI). Correlation analysis indicated that the maximum size of the amylopectin component was positively associated with ESI, while the amount of amylopectin long chains and the lengths of amylose short chains negatively correlated with ESI. Mechanistic reasons for these observations are put forward. These findings can help design new emulsifiers using starch nanoparticles, and development of "clean-label" (i.e. having relatively few ingredients, "natural" ingredients, and few synthetic additives) food emulsions.
