Journal
BIORESOURCE TECHNOLOGY
Volume 135, Issue -, Pages 191-198Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2012.10.015
Keywords
Microalgae; Chlorella vulgaris; Carbohydrate; Enzymatic hydrolysis; Acid hydrolysis
Funding
- Core Research for Evolutional Science and Technology (CREST) of the Promoting Globalization on Strategic Basic Research Programs of the Japan Science and Technology Agency (JST)
- Top University Project of NCKU
- Taiwan's National Science Council [NSC 101-3113-P-110-002, NSC 101-3113-E-006-015, NSC 101-3113-E-006-016]
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This study aimed to evaluate the potential of using a carbohydrate-rich microalga Chlorella vulgaris FSP-E as feedstock for bioethanol production via various hydrolysis strategies and fermentation processes. Enzymatic hydrolysis of C. vulgaris FSP-E biomass (containing 51% carbohydrate per dry weight) gave a glucose yield of 90.4% (or 0.461 g (g biomass)(-1)). The SHF and SSF processes converted the enzymatic microalgae hydrolysate into ethanol with a 79.9% and 92.3% theoretical yield, respectively. Dilute acidic hydrolysis with 1% sulfuric acid was also very effective in saccharifying C vulgaris FSP-E biomass, achieving a glucose yield of nearly 93.6% from the microalgal carbohydrates at a starting biomass concentration of 50 g L-1. Using the acidic hydrolysate of C vulgaris FSP-E biomass as feedstock, the SHF process produced ethanol at a concentration of 11.7 g L-1 and an 87.6% theoretical yield. These findings indicate the feasibility of using carbohydrate-producing microalgae as feedstock for fermentative bioethanol production. (C) 2012 Elsevier Ltd. All rights reserved.
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