Each rice flour was then packed in PET/Al/PE bags under vacuum (−100 kPa) using a sealer (Multivac AG500; Sepp Hagenmüller GmBH and Co., Wolfertschwenden, Germany). The packed flour was kept at 4 °C until use. Sunflower oil was purchased from Thanakorn Vegetable Oil Products, Co., Ltd. (Samutraprakarn, Thailand) and used within 7 days after the manufacturing date.