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The Effects of Annealing on Resistant Starch Contents of Cross-linked Maize Starches  

Mun, Sae-Hun (Department of Food and Nutrition and HERI, Chonnam National University)
Shin, Mal-Shick (Department of Food and Nutrition and HERI, Chonnam National University)
Publication Information
Korean Journal of Food Science and Technology / v.34, no.3, 2002 , pp. 431-436 More about this Journal
Abstract
To develop a method for increasing RS level in maize starch, cross-linked resistant starches treated with annealing were prepared. Maize starch and amylomaize VII were used in the study and annealed at $40{\sim}60^{\circ}C$ before cross-linking modification. To compare effect of annealing below gelatinization temperature, starches were heat treated at 70 and $100^{\circ}C$. RS contents were assayed by pancreatin-gravimetric (P/G) method. When maize starch and amylomaize VII were cross-linked at $45^{\circ}C$ and pH 11.0 by slurrying the starch on a solution of STMP(sodium trimetaphosphate), STPP(sodium tripolyphosphate), and sodium sulfate, RS content was 14.7% and 45.3%, respectively. Annealing below gelatinization temperature before cross-linking increased RS contents of prepared cross-linked starches but did not affect the swelling power. Heat treatment above gelatinization temperature increased the swelling power of cross-linked starch prepared from maize starch. The characteristics by X-ray diffractometry and scanning electron microscopy of cross-linked resistant starch were not changed by annealing.
Keywords
annealing; cross-linked starch; resistant starch; normal maize starch;
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