The mechanism of the textural changes such as increase in stickiness of rice cooked with acetic acid was studied focusing on the gelatinization
and rheological properties of both rice starch and rice Xour. The results of swelling power and solubility of rice starch indicated
that acetic acid promoted water absorption of amylopectin in rice starch. It was shown by DSC measurements that rice starch heated with
acetic acid was easy to gelatinize compared to that without acetic acid. The pasting properties measured by an RVA and rotational viscometer
suggested that the structure of rice starch became more Xuid by addition of acetic acid. Biochemical analysis using -amylase
indicated that the spaces which allowed the enzyme reaction were formed more in the structure of rice starch cooked with acetic acid. It
was suggested that these changes in rice starch contributed to the textural properties of rice cooked with acetic acid.
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