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Effect of particle size on kinetics of starch digestion in milled barley and sorghum grains by porcine alpha-amylase
Abstract
The influence of milled grain particle size on the kinetics of enzymatic starch digestion was examined. Two types of cereals (barley and sorghum) were ground, and the resulting grounds separated by size using sieving, with sizes ranging from approximately 0.1 to approximately 3 mm. In vitro enzymatic digestion was performed, using pancreatic alpha-amylase, amyloglucosidase and protease, to determine fractional-digestion rates over 24 h. The resulting glucose production rate data were well fitted by simple first-order kinetics. For each sieve screen size, the digestion rate of barley was always higher than that of sorghum. The rate coefficients for digestion showed a decrease with increasing size, and could be well fitted by an inverse square relationship. This is consistent with the supposition that starch digestion in these systems is controlled by diffusion of enzyme through the grain fragment. Apparent diffusion coefficients of alpha-amylase obtained by fitting the size dependence were 0.76 (sorghum) and 1.7 (barley) x 10(-7) cm2 s-1, 9 (sorghum) and 4 (barley) times slower than predicted for a molecule of the size of alpha-amylase in water.
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“Food particle size, for example, is an important predictor of starch bioaccessibility, as the fractured particle surface is exposed to enzymes, whereas diffusion is required for enzymes to access starch in the underlying cell layers (Al-Rabadi et al., 2009).”
From Role of polysaccharides in food, digestion, and health (2017) · cites this paper as Al-Rabadi et al., 2009
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Metadata
- Authors
- Al-Rabadi, G. J. S., Gilbert, R. G., & Gidley, M. J.
- Affiliations
- The University of Queensland (AU)
- Corresponding author
- Gidley, Michael J.
- Venue
- Journal of Cereal Science
- Publisher
- Elsevier BV
- Published
- 2009-09
- Volume
- 50
- Issue
- 2
- Pages
- 198-204
- ISSN
- 0733-5210 (ISSN-L)
- OpenAlex
- W1970569398
- Cited by
- 281
- References
- 28
- Citations by year
- 2026: 10 · 2025: 8 · 2024: 17 · 2023: 23 · 2022: 17 · 2021: 28 · 2020: 23 · 2019: 26 · 2018: 18 · 2017: 19 · 2016: 14 · 2015: 26 · 2014: 15 · 2013: 12 · 2012: 10
- FWCI
- 8.05
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Cereal Science (publishedVersion)
- Topics
- Health Sciences › Nursing › Nutrition and Dietetics › Food composition and properties
- Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Animal Nutrition and Physiology
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Phytase and its Applications
- Keywords
- starch hydrolysis, particle size, sorghum, first-order kinetics, enzyme diffusion, diffusion coefficient, in vitro digestion, cereals
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