OPTIMIZATION OF PARAMETERS FOR BIO-ETHANOL PRODUCTION FROM SWEET SORGHUM (Sorghum bicolor (L.) Moench) STALK JUICE AND FINGER MILLET MALT USING TAGUCHI METHOD

Dolphene Okoth, Stephen Otieno, Francis Kiema, David Onyango and Chrispin Kowenje

Publication:
OPTIMIZATION OF PARAMETERS FOR BIO-ETHANOL PRODUCTION FROM SWEET SORGHUM (Sorghum bicolor (L.) Moench) STALK JUICE AND FINGER MILLET MALT USING TAGUCHI METHOD

dc.contributor.author	Dolphene Okoth, Stephen Otieno, Francis Kiema, David Onyango and Chrispin Kowenje
dc.date.accessioned	2026-02-24T14:02:01Z
dc.date.issued	2023-11-02
dc.description.abstract	ABSTRACT. Bio-ethanol is a promising renewable energy but its production is expensive from high cost of feedstocks. In this study, sweet sorghum (Sorghum bicolor (L.) Moench) stalk juice was investigated for bio-ethanol production. Most reports on bio-ethanol productions use commercial Saccharomyces cerevisiae as yeast. However, this study used finger millet (Eleusine coracana) malt with already high adaptation to local conditions and high economic viability as it is being utilized by the indigenous communities. Five sweet sorghum varieties of IESV92001-DL (V1), NTJ (V2), 15233-IESV (V3), 92008-DJ (V4) and IESV-92028-DL (V5) were planted at 0°3'45.4644" North, 34°17'16.1052" South, in Kenya. °Brix content of juice was determined at 11th to 16th weeks after sowing. Highest °Brix for all varieties were at 15th week where V1 was highest at 22.07. V1 was then harvested for the juice. Factors affecting fermentation; temperature, time, pH and yeast to substrate ratio were optimized using Taguchi method and were obtained as 30 ℃, 48 hours, pH 5 and 5 g/L, respectively. Kinetics parameters of Vmax and Km were 0.35 g/L/h and 12.56 g/L, respectively. The optimized and kinetic parameters were within literature values and therefore finger millet malt has a great potential, as a substitute yeast source, in commercial bio-ethanol production.
dc.description.sponsorship	NRF
dc.identifier.issn	ISSN 1011-3924  2024 Chemical Society of Ethiopia and The Authors Printed in Ethiopia DOI: https://dx.doi.org/10.4314/bcse.v38i1.5 Online ISSN 1726-801X
dc.identifier.uri	https://repository.nrf.go.ke/handle/123456789/1573
dc.language.iso	en
dc.publisher	Bull. Chem. Soc. Ethiop.
dc.relation.ispartofseries	2024, 38(1), 55-67.
dc.subject	KEY WORDS: Bio-ethanol
dc.subject	Sweet sorghum juice
dc.subject	Taguchi method
dc.title	OPTIMIZATION OF PARAMETERS FOR BIO-ETHANOL PRODUCTION FROM SWEET SORGHUM (Sorghum bicolor (L.) Moench) STALK JUICE AND FINGER MILLET MALT USING TAGUCHI METHOD
dc.type	Article
dspace.entity.type	Publication