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http://dx.doi.org/10.9721/KJFST.2013.45.6.747

Physicochemical Properties of Sweet Potato Starch Reclaimed from Sweet Potato Processing Sludge  

Kim, Hyun-Seok (Department of Food Science and Biotechnology, Andong National University)
Publication Information
Korean Journal of Food Science and Technology / v.45, no.6, 2013 , pp. 747-753 More about this Journal
Abstract
The physicochemical properties of sweet potato (SP) starches reclaimed from an SP-processing sludge without freezing (RC/NF) and with freezing (RC/FR) were investigated. Lab-isolated (LI) SP starch, as a control, were prepared from raw SP. RC/NF and RC/FR SP starches were recovered from SP-processing sludges by the repeated sieving and washing procedure. The total starch contents and amylopectin branch-chain distributions did not differ for three SP starches. Relative to LI and RC/NF SP starches (possessing similar physicochemical characteristics), the apparent amylose and phosphorus contents, swelling factor, and pasting viscosity were reduced for RC/FR SP starch. However, the freezing treatment altered X-ray diffraction pattern (at $5.5^{\circ}$, $11-12^{\circ}$, and $24^{\circ}$ $2{\theta}$) of RC/FR SP starch, which likely increased its gelatinization peak and completion temperatures. Its amorphous region in total diffractogram was reduced, resulting in the enhanced relative crystallinity. Overall results suggested SP starches recovered from an SP-processing sludge would have the potential to replace commercial SP starch products.
Keywords
sweet potato processing sludge; sweet potato starch; freezing; physicochemical property;
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Times Cited By KSCI : 4  (Citation Analysis)
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