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Rice starch multi-level structure and functional relationships.

Yuyue Zhong1, Jianzhou Qu2, Zhihang Li3

  • 1Lab of Food Soft Matter Structure and Advanced Manufacturing, College of Food Science and Engineering/Collaborative Innovation Center for Modern Grain Circulation and Safety/Key Laboratory of Grains and Oils Quality Control and Processing, Nanjing University of Finance and Economics, Nanjing 210023, China; Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Denmark.

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Summary
This summary is machine-generated.

This study reveals how rice starch structures influence its properties. Higher amylose content and crystalline thickness reduce gelatinization temperature and viscosity, while affecting swelling and retrogradation.

Keywords:
Molecular structurePasting propertiesRiceStarchThermal properties

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Area of Science:

  • Food Science
  • Biochemistry
  • Materials Science

Background:

  • Rice starch properties are crucial for food applications.
  • Understanding starch structure-property relationships is key to optimizing rice-based products.

Purpose of the Study:

  • To investigate the relationships between rice starch molecular structures and their functional properties.
  • To identify key structural parameters influencing starch gelatinization, stability, and retrogradation.

Main Methods:

  • Analysis of starch from 15 rice genotypes with varying amylose content (AC).
  • Characterization of granular properties including AC, amylopectin average chain lengths (ACLfb1), crystallinity, and lamellar thicknesses (dc, da).
  • Evaluation of thermal properties (Tp, ΔH), viscosity (PV), swelling power, and retrogradation (RS, G', SB) in gelatinized systems.

Main Results:

  • Amylose content (AC) and crystalline lamellar thickness (dc) negatively correlated with peak gelatinization temperature (Tp), thermal enthalpy (ΔH), and peak viscosity (PV), but positively with swelling power.
  • Amylopectin average chain lengths (ACLfb1) and amorphous lamellar thickness (da) showed opposite correlations, highlighting their role in granular stability.
  • Increased ACLfb1 reduced retrogradation, whereas higher AC increased retrogradation, resistant starch (RS), storage modulus (G'), and setback (SB).

Conclusions:

  • Specific molecular and lamellar structures within rice starch granules significantly impact their thermal and rheological properties.
  • Amylose content and amylopectin chain length are critical determinants of starch retrogradation and resistant starch formation.
  • Tailoring rice starch structure offers potential for controlling texture, digestibility, and stability in food systems.