Effects of steeping variables and substrate mesh size on starch yield extracted from oil palm trunk

► Two different extraction starch methods from oil palm trunk using sodium metabisulphite alone and with the additional of lactic acid are proposed. ► We examined the combined effect of incubation temperature, incubation period and substrate mesh size for the extraction of starch in oil palm trunk. ► Starch extraction using sodium metabisulphite with addition of lactic acid give better starch yield. ► Starch yield increases with increase in incubation temperature and decrease in substrate mesh size.