Document Type : Research Article
Authors
Department of Food Science and Technology, Ferdowsi University of Mashhad, Mashhad, Iran.
Abstract
In this work, the effects of acetic and lactic acids addition to rice during cooking, on the texture and morphological properties, and too, the gelatinization temperature (GT) of the cooked Domsiyah rice was investigated. All experiments were carried out in triplicate and data analyzed in randomized completely by SPSS15 software. The results showed that acid addition to rice during cooking cause a decrease in firmness and GT, but had no significant effect on adhesiveness of samples. Also, the results of the scanning electron microscopy on the outer surface of cooked rice kernel revealed that the acid's addition to rice during cooking cause a reduce in pore size and porosity. According to amylography and SEM results, it seems that acid's addition to rice during cooking, cause the better gelatinization and closer pores on the outer surface of cooked rice. The results of this research can be used in improving in quality attributes of cooked rice and other products that contain rice flour and rice starch, according to the aim and application of the desirable product.
Keywords: rice, cooking, acetic acid, lactic acid, gelatinization, texture, scanning electron microscopy (SEM).
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