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Effects of grain milling on starch structures and flour/starch properties.

Journal:
Starch/Starke


Issue Date:
2014


Abstract(summary):

Milling or grinding of cereal grains to produce flour is frequently accompanied by damage to starch granules, disruption of starch crystalline structure, and degradation of starch molecules. Amylopectin (AP) molecules are more susceptible to degradation than amylose (AM) molecules as AM molecules, present in amorphous conformation in native starch granules, are more flexible than the rigid double helical crystallites made of AP branches. The changes of starch structures caused by milling alter starch properties, including gelatinization, pasting, swelling, solubility, and digestibility, and thus affect flour quality. The changes in starch structures and properties, however, are different between the grinding of cereal grains and that of isolated starch granules as the latter ignores the influences from non-starch components in grains. Hence, the grinding of isolated starch granules, commonly used to understand the effects of milling, does not represent the grinding of cereal grains. This review allows a better understanding in the changes of starch structures and properties by milling, which is important in the production of flour with desirable properties.


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