Effect of acid-catalysed in one step production of biodiesel on total sugars of defatted rice bran

Defatted rice bran is a major byproduct of rice bran-based biodiesel and rich in carbohydrate. The high amount of carbohydrate (starch) from its process can be utilized as energy fuel feedstock. In this work, the effect of acid catalyst amount and reaction time on the yield of oil and carbohydrate products in in-situ transesterification from rice bran was investigated. The longer reaction time was used; oil products (FAMEs yield and its content) and carbohydrate product (total sugars content and recovery) showed the opposite trendline. The longer reaction times was achieved, the more yield of FAMEs was obtained but the lower total sugars content on defatted rice bran. While, the less amount catalyst was enough to faster reaction and produce high total sugars content.