Feasibility of bioethanol production from tubers of Dioscorea sansibarensis and Pyrenacantha kaurabassana

•Tubers of D. sansibarensis and P. kaurabassana were found to be good ethanol sources.•Total carbohydrates were found to be 68% and 47% of dry mater.•Dilute acid hydrolysis H2SO4 (1%) achieved complete hydrolysis of the tubers.•Ethanol yield of 0.47–0.49g/g was achieved through batch fermentation.•E...

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Bibliographic Details
Published in:Bioresource technology 2015-11, Vol.196, p.613-620
Main Authors: Moshi, Anselm P., Nyandele, Jane P., Ndossi, Humphrey P., Eva, Sosovele M., Hosea, Ken M.
Format: Article
Language:English
Subjects:
Bioethanol
Biofuels
Carbon dioxide measurement
Dioscorea - chemistry
Dioscorea - metabolism
Dioscorea sansibarensis
Ethanol - chemistry
Ethanol - metabolism
Feedstock composition
Fermentation
Plant Tubers - chemistry
Plant Tubers - metabolism
Pyrenacantha kaurabassana
Tracheophyta - chemistry
Tracheophyta - metabolism
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Summary:•Tubers of D. sansibarensis and P. kaurabassana were found to be good ethanol sources.•Total carbohydrates were found to be 68% and 47% of dry mater.•Dilute acid hydrolysis H2SO4 (1%) achieved complete hydrolysis of the tubers.•Ethanol yield of 0.47–0.49g/g was achieved through batch fermentation.•Ethanol was successfully monitored through CO2 volume measurement of water. 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 35g/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 R2=0.99. Thus, tubers from these plants are potential feedstocks for bioethanol production with no competing uses.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2015.08.028