Journal
BIORESOURCE TECHNOLOGY
Volume 196, Issue -, Pages 613-620Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2015.08.028
Keywords
Dioscorea sansibarensis; Pyrenacantha kaurabassana; Feedstock composition; Bioethanol; Carbon dioxide measurement
Funding
- Tanzania Commission for Science and Technology (COSTECH)
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Inedible tubers from Dioscorea sansibarensis (DS) and Pyrenacantha kaurabassana (PK) were found to be suitable feedstock for bioethanol production. Important composition parameters for bioethanol production for DS and PK are dry matter (% fresh tubers) ca. 20 and 6, total carbohydrates % dry weight base (db) ca. 68 and 47 and total protein (% db) ca. 16 and 10, respectively. DS and PK were found to contain inulin and galactomannan as principal polysaccharides (% of total carbohydrate) ca. 90 and 70, respectively. Diluted acid hydrolysis yielded ca. 100% of total reducing sugars. Ethanol yield ca. 56 and 35 g/L was obtained at high efficiency through batch fermentation of acid hydrolysate (25% w/v) of DS and PK, respectively. A simple technique of recording and monitoring ethanol through CO2 generated during fermentation correlated strongly with HPLC measurement R-2 = 0.99. Thus, tubers from these plants are potential feedstocks for bioethanol production with no competing uses. (C) 2015 Elsevier Ltd. All rights reserved.
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