Comparison of agarophytes (Gelidium, Gracilaria, and Gracilariopsis) as potential resources for bioethanol production |
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Authors: | Maria Dyah Nur Meinita Bintang Marhaeni Tjahjo Winanto Gwi-Taek Jeong Mohammed Nurul Absar Khan Yong-Ki Hong |
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Affiliation: | 1. Department of Fisheries and Marine Science, Jenderal Soedirman University, Purwokerto, Indonesia 2. Department of Biotechnology, Pukyong National University, Busan, 608-737, South Korea 3. Department of Fisheries Technology, Bangladesh Agricultural University, Mymensingh, 2202, Bangladesh
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Abstract: | This study explores the possibility of producing ethanol using the acid hydrolysate of three abundant agar-containing red seaweeds (agarophytes): Gelidium amansii, Gracilaria tenuistipitata, and Gracilariopsis chorda. The main component in the seaweed samples was agar, which ranged from 20 to 51 % (g g?1 dry weight). After optimizing acid hydrolysis, 100 g of seaweed was hydrolyzed at 130 °C for 15 min with 0.2 M H2SO4. Then, 120 mL of a 1:2 mixture of the hydrolysate broth and basal medium was fermented in a 200-mL bottle at 30 °C for 96 h. Of the three seaweeds, G. amansii had the best ethanol yield, producing 0.23 g g?1 of galactose or 45 % of the theoretical yield. This yield increased to 60 % after detoxification of the hydrolysate with activated carbon. |
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