Processing And Utilization Of Tropical Root Crops I. Physico-Chemical Characterization Of Cocoyam Starches

Roberta  D. Lauzon,; Akiko  Kawabata,

Processing And Utilization Of Tropical Root Crops I. Physico-Chemical Characterization Of Cocoyam Starches

Abstract:

Starch was produced from red and white cocoyams following the method developed by the Food Science Section of the Department of Agricultural Chemistry and Food Science (DAC-FS), ViSCA, Baybay, Leyte. Purified starch samples were used in the analytical works. Granular size distribution and x-ray diffraction pattern determination were carried following the methods used by Kawabata et al. (1981) and Nakagawa (1973), respectively. Chemical properties were determined using the standard methods set by the Association of Official Analytical Chemist (AOAC, 1980). Starch granules of red and white cocoyams were spherical and semi-spherical in shape. Starch granules ofred cocoyam were bigger than starch granules of white cocoyam. Starches from both cocoyams belonged to C type. Moisture content of red and white cocoyam starch was 11.49% and 11.99%, respectively. Inorganic matters content (P, K, Ca and Mg) were higher in red cocoyam than in white cocoyam starch.

References:

Association of Official Analytical Chemist (AOAC). 1980. Official methods of analysis. 13^th ed. Howits, Washington, D.C., U.S.A. pp. 158-169.
Kawabata, A., Sawayama, S. and Murayama, A. 1981. Amylose content, viscosity behavior and dynamic viscoelastic properties in the gelatinization process of cassava and sago starches. J. Jap. Soc. Starch Sci. 29:18-21.
Lauzon, R.D., Garana, R.R. and Mabesa, L.B. 1986. Physico-chemical characterization of cocoyam flour. Ann. Trop. Res. 8(3)123-130.
Nakagawa, T. 1973. Rheology of starches. Unpublished Thesis. Tokyo University of Agriculture, Tokyo, Japan. pp. 102-112.
Plucknett, D.L. 1970. Colocasia, Xanthosoma, Alocasia, Cystosperma and Amorphophalus. Tropical root and tuber crops tomorrow. pp. 127-129.