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  • Chem Sci Trans., 2015, 4(2),  pp 331-336  

    DOI:10.7598/cst2015.986

    Research Article

    Effect of Hydrolysis Reaction Time on the Reducing Sugar Yield of Acha (Digitaria exilis) and Finger Millet (Eleusine coracana) Starch for Bioethanol Production

  • A U. OFOEFULE1*, U C. OKORO2 and O D. ONUKWULI3
  • 1Biomass Unit, National Center for Energy Research and Development, University of Nigeria, Nsukka, Enugu state 2Department of Pure & Industrial Chemistry, University of Nigeria, Nsukka, Enugu state 3Department of Chemical Engineering, Nnamdi Azikiwe University, Awka, Anambara state, Nigeria
  • Abstract

    The effect of hydrolysis reaction time on the reducing sugar yield of Acha (Digitaria exilis) and Finger millet (Eleusine coracana) starch for bioethanol production was studied. The starches were extracted from the feedstocks by wet and dry milling methods. They were gelatinized at slurry concentrations of 2.0, 2.5, 3.0 and 3.5 mL/g for Acha and slurry concentrations of 2.5, 3.0, 3.5 and 4.0 mL/g for finger millet. They were then hydrolyzed using malted barley as enzyme at enzyme concentrations of 0.1g/g to 0.3g/g at durations ranging from 1 - 3 h. The results showed that for the two starches studied, none achieved highest reducing sugar yield at 1 - 2 h. The optimum fell largely between 3 to 3 h. Overall results indicate that reducing sugar quantity is largely dependent on slurry concentration (mL/g) of starch, hydrolysis reaction time and even temperature.

    Keywords

    Hydrolysis reaction time, Enzyme concentration, Reducing sugar yield, Bioethanol production, Finger millet, Acha

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