Deptartment of Food Technology Federal Polytechnic, PMB 5351, Ado-Ekiti, Ekiti State, Nigeria.
A preliminary study on statistical modelling of a process for depolymerisation of cassava non-starch carbohydrate using halide salt assisted phosphoric and pyruvic acids were accomplished. The effects of three independent variables namely; acid concentration, potassium iodide salt and duration were studied using the central composite rotatable design on hydrolysis of the cassava non-starch carbohydrate. Hydrolysate marker, reducing sugar was evaluated as a measure of depolymerisation, consequently used as response in the study. Equations for predicting the response were developed and adequacy confirmed using analysis of variance and residual assessment. The predictive model provides the potentials of using phosphoric acid and pyruvic acid as depolymerisation agent for cassava non-starch carbohydrate in the presence of potassium iodide salt. This would open a new opportunity for depolymerisation of cassava non-starch carbohydrate that is usually used for low premium animal feed or left as dung resulting to environmental pollution.
Baik, B. K. & Dalgetty, D. D. (2003). Isolation and characterization of cotyledon fibers from peas, lentils and chickpeas. Cereal Chemistry, 80(3): 310-315.
Chaplin, M. F. (1986). Monosaccharide. In Chaplin MF, Kennedy JF, editors. Carbohydrates analysis. Oxford IRL Press pp 3.
Cochran, W. G. & Cox, G. M. (1957). Experimental Design 2nd Edition, John Wiley and Sons, New York USA.
Fontana, J. D., Mitchell, D. A., Molina, O. E., Gaitan, A., Bonfim, T. M. B., Adelmann, J., Grzybowski, A. & Passos, M. (2008). Starch depolymerisation with dilute phosphoric acid and application of the hydrolysate in astaxanthin fermentation. Food Technology Biotechnology, 46(3) 305-310.
Gamez, S., Ramirez, J. A., Garrote, G. & Vazque, Z. M. (2004). Manufacture of fermentable sugar solutions from sugar cane bagasse hydrolyzed with phosphoric acid at atmospheric pressure. Journal of Agricultural Food Chemistry, 52(13) 4172-4177.
Liu, Z. L., Slininger, P. J., Dien, B. S., Berhow, M. A., Kurtzman, S. W. & Gorsich S.W. (2004). Adaptive response of yeasts to furtural and 5-hydroxymethyl furfural and new chemical evidence for HMF conversion to 2, 5-bis-hydroxymethyl furan. Journal of Industrial Microbiology. Biotechnology, 31:345-352.
Mosier, N., Wyman, C., Dale, B., Elander, R.., Lee, Y. Y., Holt Zapple, M. & Ladisch, M. (2005). Features of promising technologies for pretreatment of ligno cellulosic biomass. Bioresource Technology, 96:673-686.
Snedecor, G. W. (1956). Statistical Methods, 5th Edn, Iowa State College Press.
Sun, Y. & Cheng, J. (2002). Hydrolysis of lignocellulosic materials for ethanol production: a review. Bioresource Technology. 83:1-11.
Zhang, R., Lu, X., Sun, Y., Wang, X. & Zhang, S. (2011). Modelling and Optimization of dilute nitric acid hydrolysis on Corn Stover. J. Chem Technol Biotechnol 86:306-314.
Zhao, X., Zhou, Y. & Liu, D. (2012). Kinetic model for glycan hydrolysis and formation of monosaccharides during dilute acid hydrolysis of sugarcane bagasse. Bioresource Technology 105:160-168.
Zuwei, X., Kunlan, L., Lixin, X., Jun, L., Jun, P. & Guoying, C. (2001). Salt-assisted acid hydrolysis of starch to D-glucose under microwave irradiation. Carbohydrate Research 331: 9-12.