Journal
BIORESOURCE TECHNOLOGY
Volume 244, Issue -, Pages 234-242Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.07.140
Keywords
Coconut; Alkaline pretreatment; High-solid load; Advanced bioethanol; Non-detoxified; hydrolysate; Mesocarp
Funding
- CNPq [458029/2014-9, 303902/2013-2, 304719/2014-5]
- FAPES [48497231]
- SBO from IWT-Flanders [90043]
- CAPES (Ministry of Education of Brazil) [99999.004235/2014-02]
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The residual biomass obtained from the production of Cocos nucifera L. (coconut) is a potential source of feedstock for bioethanol production. Even though coconut hydrolysates for ethanol production have previously been obtained, high-solid loads to obtain high sugar and ethanol levels remain a challenge. We investigated the use of a fed-batch regime in the production of sugar-rich hydrolysates from the green coconut fruit and its mesocarp. Fermentation of the hydrolysates obtained from green coconut or its mesocarp, containing 8.4 and 9.7% (w/v) sugar, resulted in 3.8 and 4.3% (v/v) ethanol, respectively. However, green coconut hydrolysate showed a prolonged fermentation lag phase. The inhibitor profile suggested that fatty acids and acetic acid were the main fermentation inhibitors. Therefore, a fed-batch regime with mild alkaline pretreatment followed by saccharification, is presented as a strategy for fermentation of such challenging biomass hydrolysates, even though further improvement of yeast inhibitor tolerance is also needed.
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