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Related Experiment Video

Updated: Jul 17, 2026

Transverse Sectioning of Mature Rice (Oryza sativa L.) Kernels for Scanning Electron Microscopy Imaging Using Pipette Tips as Immobilization Support

Transverse Sectioning of Mature Rice (Oryza sativa L.) Kernels for Scanning Electron Microscopy Imaging Using Pipette Tips as Immobilization Support

Published on: January 25, 2022

Rice amylopectin fine structure variability affects starch digestion properties.

Mustapha Benmoussa¹, Karen A K Moldenhauer, Bruce R Hamaker

¹Whistler Center for Carbohydrate Research and Department of Food Science, Purdue University, 745 Agriculture Mall Drive, West Lafayette, IN 47907, USA. mbenmous@purdue.edu

Journal of Agricultural and Food Chemistry

|January 31, 2007

Summary

Researchers explored rice cultivars for low glycemic response by analyzing starch properties. Rapid Viscoanalyzer (RVA) breakdown viscosity effectively predicts starch digestibility, aiding in developing low glycemic rice.

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Analysis and Specification of Starch Granule Size Distributions

Analysis and Specification of Starch Granule Size Distributions

Published on: March 4, 2021

Area of Science:

Agricultural Science
Food Science and Technology
Biochemistry

Background:

Rice is a staple food, but its high glycemic index can be a health concern.
Starch digestibility in rice influences its glycemic response.
Amylopectin structure and pasting properties are key factors affecting starch digestion.

Purpose of the Study:

To investigate the relationship between rice starch digestibility and amylopectin fine structure.
To explore the potential of Rapid Viscoanalyzer (RVA) as a tool for screening rice cultivars with varying starch digestion properties.
To identify rice cultivars with low glycemic response and inform breeding strategies for low glycemic rice.

Main Methods:

Selected twelve rice cultivars with varied RVA pasting breakdown and similar amylose content.
Analyzed in vitro starch digestibility using the Englyst assay.
Characterized pasting properties using RVA and debranched amylopectin structure.

Main Results:

Rapidly digestible starch (RDS) correlated negatively with long/intermediate amylopectin chains and positively with very short chains.
Slowly digestible starch (SDS) showed the opposite correlation pattern with amylopectin chain lengths.
RVA breakdown viscosity strongly correlated with both RDS and SDS, indicating its predictive potential for starch digestion.

Conclusions:

Amylopectin fine structure variability underlies differences in starch digestion properties among rice cultivars.
RVA is a viable screening tool for assessing starch digestion and identifying rice with low glycemic potential.
Findings support breeding strategies for developing new rice cultivars with improved glycemic response.