For palatability and physicochemical analyses, the rice grains were hulled and milled to 91% yield. Palatability was measured using a rice taste measuring system (Toyo taste meter, model MA-90) in accordance with the operation manual (TRCM Co.) (Toyo Rice Polishing Machine Factory, Japan).
PC was calculated using total nitrogen multiplied by 5.95 after determination of the nitrogen content of rice material by the micro-Kjeldahl method (24).