Journal
CARBOHYDRATE POLYMERS
Volume 254, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2020.117275
Keywords
rice starch; digestion kinetics; chain-length distribution; molecular size distribution; logarithm of slopes method (LOS); size-exclusion chromatography
Categories
Funding
- Youth Fund of Jiangsu Natural Science Foundation [BK20190906]
- National Natural Science Foundation of China [32001646]
- Jiangsu Yangzhou Key Research and Development Program [SSF2018000008]
- Jiangsu provincial Entrepreneurial and Innovation Phd Program
- Yangzhou Lvyangjinfeng Talent Program
- Jinan University of National Innovation and Entrepreneurship Training Program
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The study found that fully gelatinized rice starches have two simultaneous digestion fractions (fast versus slow), with the rate constants of the slowly-digestible fraction significantly correlated with starch molecular sizes, especially with that of amylopectin molecules. Hydrodynamically larger amylopectin molecules tend to contain more shorter branches but less long chains, impacting the overall digestion rate.
In current study, the effects of starch fine molecular structures on its in vitro digestibility at fully gelatinized stage were investigated. The digestion kinetics of 15 fully gelatinized rice starches were obtained and correlated with starch chain-length distributions and molecular size distributions. Both logarithm of slopes and parallel first-order kinetic model were applied to fit the digestion curves to a few kinetics-based parameters. Result showed there were two simultaneous digestion fractions (fast versus slow) for fully gelatinized rice starches. The rate constants of slowly-digestible fraction significantly correlated with starch molecular sizes, especially with that of amylopectin molecules. Hydrodynamically larger amylopectin molecules tend to contain more shorter branches but less long chains. This slows down the starch hydrolysis by alpha-amylase while the action of AMG is less antagonistically hindered, increasing overall digestion rate. This study provides important information for rice breeders and manufacturers to develop rice products with reduced starch digestibility.
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