Effects of Composite Rice Flour and Water Content on Qualities of Thai Rice Cake

Abstract

This study was conducted to determine the effects of composite rice (Jasmine, JR and Yellow-11 varieties) flour ratio and water content on the physical quality and sensory acceptability of Thai rice cake. A 3×3 full factorial design was used: 3 ratios of JR and Yellow-11 rice flours (10:90, 20:80, 30:70) and 3 levels of water content (0.3, 0.5, 0.7 times of dry-mix weight) were investigated. As the amount of JR flour increased, the amylose content of the composite flour decreased, causing springiness of Thai rice cake to decrease due to a loss in expandability of the flour. The optimal composite flour ratio was 20:80 with added water at 0.5 times of the dry-mix weight. This ratio produced the Thai rice cake with acceptable softness and springiness, and overall liking of the product was rated as “like moderately.” The water ratio greater or lesser than 0.5 times, respectively, resulted in a sticky or dry product.