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Structure of pyrodextrin in relation to its retrogradation properties
Xiaoxian Han1, Ji Kang2, Yanjie Bai2
1College of Food Science and Engineering, Henan University of Technology, Zhengzhou 450001, China; Department of Grain Science and Industry, Kansas State University, Manhattan, KS 66506, USA.
Heating waxy maize starch creates pyrodextrins with increased water solubility and reduced retrogradation. Structural changes, including higher branching and shorter chains, explain these improved functional properties.
Area of Science:
- Food Science
- Carbohydrate Chemistry
Background:
- Pyrodextrins are modified starches with diverse applications.
- Understanding their structural properties is key to optimizing their functionality.
Purpose of the Study:
- To investigate the structural modifications of pyrodextrins during thermal processing.
- To correlate structural changes with functional properties like solubility and retrogradation.
Main Methods:
- Waxy maize starch was heated at 170°C and pH 3.0 for varying durations.
- Structural analysis using gel permeation chromatography and 1H NMR.
- Thermal properties (gelatinization, retrogradation) assessed by differential scanning calorimetry.
Main Results:
- Water solubility increased from 48.9% to 99.4% with extended heating.
- Molecular size, melting enthalpy, and retrogradation degree decreased as solubility increased.
- 1,6-anhydro-β-d-glucopyranose content rose from 2.6% to 4.0%.
- Degree of branching (DB) increased from 8.8% to 14.4%, while average chain length (CL) decreased from 7.2 to 4.6.
Conclusions:
- Thermal processing significantly alters pyrodextrin structure, enhancing water solubility.
- Increased branching and reduced chain length contribute to decreased retrogradation.
- These modifications offer potential for improved pyrodextrin functionality in food systems.
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