Milling of rice grains: the roles of starch structures in the solubility and swelling properties of rice flour

Hasjim, Jovin, Li, Enpeng and Dhital, Sushil (2012) Milling of rice grains: the roles of starch structures in the solubility and swelling properties of rice flour. Starch, 64 8: 631-645. doi:10.1002/star.201100204


Author Hasjim, Jovin
Li, Enpeng
Dhital, Sushil
Title Milling of rice grains: the roles of starch structures in the solubility and swelling properties of rice flour
Journal name Starch   Check publisher's open access policy
ISSN 0038-9056
1521-379X
Publication date 2012-08
Sub-type Article (original research)
DOI 10.1002/star.201100204
Volume 64
Issue 8
Start page 631
End page 645
Total pages 15
Place of publication Weinheim, Germany
Publisher Wiley - VCH Verlag
Collection year 2013
Language eng
Abstract Rice flours with different particle sizes and degrees of damaged starch granules were produced by hammer milling and cryogenic milling of rice grains, where degradation of starch molecules was evident in the hammer-milled flours, but not in the cryogenically milled flours. The solubility and swelling properties of the resulting rice flours were determined in cold (30°C) and hot water (90°C). The cold- and hot-water starch solubility was strongly correlated with the degree of damaged starch granules, and weakly with the particle size of rice flour. No evident correlations were observed between starch solubility and the molecular structures, indicating that molecular degradation by milling process was not the only precondition of increased starch solubility. Possible mechanism for the observed correlations is that increasing surface area and/or exposure of loosely packed inner part of starch granules with increasing degree of damaged starch granules allowed more starch molecules to leach out in cold and hot water. Furthermore, the cold-water swelling of rice flour was strongly correlated with the degree of damaged starch granules, possibly due to the rapid hydration of damaged starch granules, whereas the hot-water swelling did not show any correlations with flour particle size and granular and molecular starch structures. The results have provided better insights in the relationship between starch structures and solubility and swelling properties of rice flour, which can be used to improve the manufacture and selection criteria of rice flour for better products.
Keyword Molecular structure
Rice flour
Solubility
Starch
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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