Rice samples
Pigmented rice samples used in this study were harvested in March 2009 and provided by Pattani Rice Research center, Pattani, Thailand. Eight varieties of pigmented rice grains, consisted of 3 non waxy rice Homkradunga, (HK), Kumyan (KN), Songyod (SY) and 5 varieties of waxy rice Red waxy rice-96060 (RWR-96060), Kramrad (KR), Black waxy rice-96044 (BWR-96044), Black waxy rice-96025 (BWR-96025) and Chormaiphai (CMP). Rough rice grains were dehusked, and brown rice obtained was stored at 4°C.