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Improved Extractibility Of Sweet Potato Starch Using Commercial Hydrolytic Enzymes

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  036070,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.14134) @2003
Authors:   S. M. Mahfuzur Rahman, Sudip K. Rakshit
Keywords:   substrate, hydrolytic, enzymes, rasping

The starch granules present in the sweet potato roots are imbedded in cellulosic fibers and held together by pectin substrates. Rasping the chopped roots conventionally does the extraction of starch. Vision of this study was to investigate the effect of endogenous and commercial hydrolytic enzymes (cytolase, pectinase and cellulase) whether breakdown these substrates could lead to better release of the starch granule.

The experiments revealed that the inherent or endogenous enzyme had no substantial effect on improving starch extraction. However, the addition of commercial enzyme was found to increase the extraction of starch considerably even at lower levels of rasping. It was found that cytolase enzyme at 0.2% (v/w) level that is a combination of pectinase and carbohydrases was able to enhance starch extraction more than two and half fold than that of control. Besides this, mixture of cytolase and pectinase at 0.1% level gave also more than 95% starch recovery. Mixing and optimum temperature for action of the enzymes during incubation increases starch yields.

It was found that enzymes addition could serve as a good alternative to increased rasping, which could break down the fiber to get out the starch granule. With the drop in price of the enzymes this could lead to cost saving over the amount spent in rasping. Thus enzyme-assisted extraction can perform a major role in getting better yields and quality of starch in an environmentally friendly way.

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