International Journal of Agricultural Policy and Research Vol.1 (6), pp. 156-165, August 2013
© 2013 Journal Issues
Article ID /13/JPR15, 11 pages
Original Research Paper
Comparative study of some varieties of cassava grown and consumed in Bayelsa State as prospective biofuel and energy food sources
Accepted 1st June, 2013
Department of Biochemistry, Faculty of Science, Niger Delta University, Bayelsa, Nigeria
Author E-mail: email@example.com
The present study compared the ethanol and starch content of seven varieties of cassava (Manihot esculenta Cruntz) grown and consumed in Bayelsa state for their possible use as biofuels and energy nutrient sources. Also the functional groups in cassava and other energy food crops – maize and sugarcane used as biofuels were compared. Mild acid hydrolysis of cassava tubers was done with 0.5% sulphuric acid, while fermentation was carried out using yeast preparation (Saccharomyces cerevisae strains). The concentration of ethanol in sample was then carried out using dichromate colorimetric method. Analysis of starch in samples was achieved by combined acid and enzymatic hydrolysis. Infrared spectroscopy was employed for functional groups determination. Results showed that the ethanol concentration was from 3.11 – 29.33 (%), while the starch content was between 26.3 to 56.3 (%) for the seven cassava varieties. Infrared spectroscopy of the three crops showed the presence of alcoholic groups in the following decreasing order: sugarcane > cassava > maize. Although minimal levels of SO2 and NO2 groups were implied, pollutant producing ability thereby followed same decreasing order. Among those common biofuel crops, cassava compared favourably in terms of alcoholic content and ability to prove environmental friendly. The varieties of cassava traditionally named “Oguru”, “Agric Rowaina” and “Yomugha”,which produced the highest concentration of ethanol, could be further explored for more efficient utilization as such; whereas those containing high starch levels employed as energy nutrients and other uses.
Key word: Biofuels, cassava, maize, sugarcane, starch, ethanol, functional groups.