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Updated: Jun 7, 2026
08:46
Analysis and Specification of Starch Granule Size Distributions
Published on: March 4, 2021
Effect of enzymatic hydrolysis on native starch granule structure
Jaroslav Blazek1, Elliot Paul Gilbert
1Bragg Institute, Australian Nuclear Science and Technology Organization, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia.
Biomacromolecules
|November 2, 2010
Summary
Enzymatic digestion of starch granules is influenced by their internal nanostructure, particularly the amorphous and semicrystalline growth rings. Starch type (A or B) affects digestion patterns and accessibility for enzymes.
Area of Science:
- Carbohydrate chemistry
- Biomaterials science
- Structural biology
Background:
- Starch granules possess a hierarchical nanostructure with amorphous and semicrystalline growth rings.
- Enzymatic digestion is crucial for starch breakdown but its nanostructural basis is not fully understood.
- Botanical origin influences starch structure and digestibility.
Purpose of the Study:
- To investigate the real-time nanostructural changes in starch granules during enzymatic digestion.
- To correlate starch nanostructure with enzymatic digestibility.
- To understand the role of growth rings and starch type (A vs. B) in digestion.
Main Methods:
- In situ time-resolved small-angle neutron scattering (SANS) for real-time nanostructure analysis.
- X-ray diffraction (XRD), differential scanning calorimetry (DSC), small-angle X-ray scattering (SAXS), and scanning electron microscopy (SEM) for complementary analysis.
- Studied six starches of different botanical origins.
Main Results:
- Time-resolved SANS revealed decreasing lamellar peak intensity and increasing low-q scattering during digestion.
- These changes were more pronounced in A-type starches than B-type starches, indicating preferential digestion of amorphous growth rings.
- Enzymatic attack morphology varied, with granular pores and channels affecting enzyme accessibility.
Conclusions:
- Starch granule microstructure and growth ring nanostructure significantly determine enzymatic digestibility.
- The accessibility of the enzyme to the substrate is influenced by granular pores, channels, and amorphous ring penetrability.
- Differences in amylopectin structure between A-type and B-type starches explain variations in hydrolysis of semicrystalline growth rings.
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