Journal
SOUTH AFRICAN JOURNAL OF BOTANY
Volume 115, Issue -, Pages 161-169Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.sajb.2018.01.021
Keywords
Ulva rigida; Hydrolysate; Fermentation; Bioethanol; Pachysolen tannophilus; Adaptation
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We investigated the feasibility of bioethanol production from hydrolysate of green seaweed Ulva rigida. The pretreatment of the green macroalgae was optimized using thermal acid hydrolysis to obtain a high reducing sugars yield. The dry seaweed biomass, (5 to 15% w/v) was hydrolyzed with two different acid catalysts, H2SO4 and HCl at a concentration of 0 to 10.0% (v/v). The hydrolysis times ranging from30 to 60min were investigated when the mixture was autoclaved. A condition of 4% (v/v) sulfuric acid, 10% (w/v) biomass loading and 1 h of incubation time was optimum to obtain maximum total fermentable reducing sugar concentration of 34 +/- 0.25 mg/ml and 0.50 +/- 0.02 mg/ml of phenolic compounds. Fermentation of the hydrolysate using adapted and non-adapted Pachysolen tannophilus produced 0.12 g/g and 0.09 g/g (ethanol to dry seaweed), respectively. These preliminaries results indicate a potential use of the macroalgae U. rigida for bioethanol production. (c) 2018 SAAB. Published by Elsevier B.V. All rights reserved.
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