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http://dx.doi.org/10.9721/KJFST.2021.53.6.749

Production and characterization of rice starch from stale rice using improved enzymatic digestion method  

Kim, Reejae (Department of Food Science and Biotechnology, Graduate School, Kyonggi University)
Lim, SongI (Department of Food Science and Biotechnology, Graduate School, Kyonggi University)
Kim, Hyun-Seok (Department of Food Science and Biotechnology, Graduate School, Kyonggi University)
Publication Information
Korean Journal of Food Science and Technology / v.53, no.6, 2021 , pp. 749-755 More about this Journal
Abstract
The objective of this study was to investigate the physicochemical properties of rice starch extracted from stale rice using alkaline steeping (AKL) and improved enzymatic digestion (iENZ) methods. The crude protein content (0.5-0.7%) of stale rice starch (SRS) was less than 1% by iENZ, but not so when measured by the existing ENZ methods. SRS is an intermediate amylose rice starch. AKL-SRS and iENZ-SRS exhibited typical A-type crystal packing arrangements with similar relative crystallinities. iENZ-SRS showed higher gelatinization onset and peak temperatures with a narrower gelatinization temperature range, compared to those of AKL-SRS, indicating that iENZ annealed SRS. Thus, iENZ-SRS exhibited lower swelling power and solubility, and higher pasting viscosities with delayed viscosity development. Overall, the use of stale rice as a rice starch source could make economical production of rice starch possible, and iENZ may diversify rice starch characteristics, which expands the utilization of rice starch in food and non-food industries.
Keywords
stale rice; rice starch; enzymatic digestion method; alkaline steeping method; physicochemical property;
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