ABSTRACT
Acanthophora spicifera (Red algae) and Dictyopteris australis (Brown algae), biomasses were pretreated and subjected to fermentation. Acid pretreatment yielded 35.82±0.12 mg/g and 28.04±0.09 mg/g of reduced sugar respectively. Acid pretreated biomass subjected to enzyme hydrolysis yielded 216 mg/g and 187 mg/g of reduced sugar. Separate hydrolysis and fermentation was carried out for acid hydrolysate using yeast strain isolated from cashew fruit juice (CJY) and toddy juice (TJY) hydrolysate with CJY strain yield 137 mg/g and 107 mg/g respectively of ethanol and TJY yielded 240 mg/g and 190 mg/g respectively for A. spicifera and D. australis of ethanol achieving 26.4 and 20.6 and 47.8 % and 37.4 % theoretical efficiency respectively in SHF process. In SSF process, TJY yielded higher ethanol yield of 470 mg/g and 370 mg/g, achieving 84.2% and 73.7% theoretical efficiency and exhibiting thermo tolerance ability.
Keywords: Acanthophora spicifera (Red algae) and Dictyopteris australis (Brown algae), Bioethanol, SHF, SSF, Thermo tolerance.