International Conference on Food Science and Bioprocess Technology
November 20-22, 2017 Dubai, UAE
Optimization of Color and Thermal Properties of Sweet Cassava (Manihot Esculenta Crantz Var. Uvlnr 0005) Flour using Response Surface Methodology
University of Venda, South Africa
Background and Objective: Cassava is an essential foodstuff in the tropical regions of the world. It is high in calories and also a very good source of revenue for many countries. Present study focused on optimizing quality of cassava (UVLNR 0005) flour in terms of color and thermal qualities.
Materials and Methods: A central composite rotatable drying experiments comprising of two factors: drying temperature (60-70°C) and drying time (15-20 h) was designed using Stat-Ease design expert software. The software was also used to carry out one way analysis of variance (P < 0.05), regression analysis, optimization of color and thermal properties and obtain contour plots for interactions between the drying conditions, color and thermal properties.
Results: Results indicated that the drying conditions used in this study had no significant effect on color and thermal properties of cassava (UVLNR 0005) flour. The range of L*, a *, b*, hue, chroma and WI were 87.67-93.57, -0.27-1.1, 8.4-11.83, 84.87-91.5, 8.4-11.87 and 82.88-89.42 respectively. The onset, peak, conclusion temperatures and enthalpy of gelatinization ranged between 93.68 to 114.21°C, 100.35 to 118.49°C, 108.73 to 123.51°C and 3.74 to 11.54°C respectively. Mathematical models obtained for the prediction of color and thermal properties at different drying temperatures and time were characterized with insignificant (P > 0.05) lack of fit test and high regression values. Drying conditions of 65.34°C drying temperature, 16.48 h drying time were found optimum for product quality at a desirability of 0.78.
Conclusion: It was concluded that use of the optimum drying conditions obtained in this study for drying cassava chips can help preserve the color and thermal qualities of cassava flour.
Keywords: Cassava; response surface methodology; thermal properties; flour; optimization; models; contour plots; drying
Patrick F. Kapila, a senior lecturer in the Department of Agricultural and Rural Engineering, University of Venda, South Africa. My research interest includes agricultural engineering and farm mechanization.