ISHS Acta Horticulturae 380: Symposium on Tropical Root Crops in a Developping Economy
ENZYMATIC STARCH EXTRACTION FROM TROPICAL ROOT AND TUBER CROPS |
| Authors: | J. Kallabinski, C. Balagopalan |
| Abstract:
The production of starch from tropical root and tuber crops could be a way to get higher economic gains in developing countries. The present method used for starch extraction which includes tuber crushing, sieving, sedimentation, and drying, lead to starch losses of up to 20% and also involves high energy inputs, the use of much water, and expensive machinery. To obtain high recovery of starch, attempts have been made to replace the traditional mechanical method by the use of commercial cell wall degrading enzymes to release starch from cassava roots. The treatment of ground cassava roots with pectinolytic enzymes (0.1 ml/100 g fresh cassava root) increases starch recovery by 3.06, 9.70, and 10.10% after 2 h and 4.12, 12.95, and 16.40% after 4 h incubation at 45°C for different pectinases, respectively. The cellulase treatment (0.1 ml/100 g) increased starch recovery by 16.14% after 2 h and 15.70% after 4 h. The combined use of both pectinase and cellulase (0.1 ml + 0.1 ml/100 g) resulted in higher recovery of starch as against the separate use of 29.16% and 36.02% after 3 h incubation at 45°C. The use of the best enzyme combination for starch recovery from ground cassava samples resulted in an increase of 21.49% when used on fresh cassava chips compared with a maximum extractable starch by mechanical method. The results were confirmed in experiments with sweet potato also. | |
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