Effect of some micronutrients on the production of bioethanol from water hyacinth by Saccharomyces cerevisiae AB810

The study was done to investigate the role of various micronutrients on the production of bioethanol by an ethanol and temperature resistant strain of Saccharomyces cerevisiae AB 810 as a suitable fermentation medium. Microelements like Zn2+, Mn2+ and Fe3+ were effectively required for the ethanol and temperature resistant strain to increase ethanol production. The optimum amount was required for the maximum production of bioethanol from water hyacinth was Zn2+ 5 14/ml, Mn2+: 10 mu g/ml and Fe3+: 15 mu g/mL respectively. The other microelements mainly Cu2+, Ni2+, Co2+, Fe2+ and Mo6+ had shown an adverse effect on bioethanol production by this strain. This study shows that the addition of specific essential microelements into the fermentation medium helped in increase the bioethanol amount from 10.4% to 12.2% (v/v) compared to unsupplied micronutrients.