Abstract
<p>The aim of this research was study of E. cottonii to produce bioethanol fermentation substrate with a high reduction sugar content and low Hidroxymethilfurfural (HMF). Fermentation done by instant yeast and Saccharomyces cerevisiae culture of FNCC 3012.The best treatment was obtained in the combination of 2% of H2SO4 by time reaction of 120 minutes in 80°C produced 15.61 g/l reducing sugar and 5.03 g/l HMF. In fermented process, the hydrolysate with instant yeast starter delivered much more efficiency in 3.63 ml CO2 volume, 87.53% in fermentation efficiency, and 1.96 g/l reducing sugar on fifth day of fermentation. <br /><strong>Keywords</strong>: bioethanol, Eucheuma cottonii, fermentation, hydrolysis, process design</p>
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