Study on the effect of yeast concentration and fermentation time on bioethanol production from Eucheuma denticulatum (N.L.Burman) F.S.Collins & Hervey / Haziratul Mardhiah Hamdan

This study aims to study the effectiveness of different yeast concentration and different fermentation time on the bioethanol production yield from the red seaweed, Eucheuma denticulatum (N.L.Burman) F.S.Collins & Hervey. By conducting a standardized, low concentration and high temperature acid hydrolysis on the seaweed upon the fermentation stage, findings showed that a minimum of yeast concentration of 20 wt% is needed to produce any alcohol while the minimum amount of fermentation time is 72 hours. Higher yeast concentrations and longer fermentation time would increase the ethanol yield, yet a yeast concentration above 30 wt% and fermentation time extending beyond 120 hours would result in an inefficient and unproductive bioethanol production.