Effect of partial acid hydrolysis and heat-moisture treatment on formation of resistant tuber starch

Shin, S.; Byun, J.; Park, K.H.; Moon, T.W.

Effect of partial acid hydrolysis and heat-moisture treatment on formation of resistant tuber starch

2004

Shin, S. | Byun, J. | Park, K.H. | Moon, T.W.

Structural characteristics of resistant starch (RS) were investigated. Tuber starches, hydrolyzed with 1N HCl at 35 degrees C for 8 hr followed by autoclaving-cooling treatment, were heated at 100 degrees C for 16 hr after adjusting the moisture content to 20 or 30%. RS content of the tuber starches ranged from 5.4 to 22.7% depending on the source and type of treatment. Gelatinization parameters of RS isolated from partially acid-hydrolyzed starch with autoclaving-cooling followed by heat-moisture treatment (HMT) showed higher enthalpy (deltaH) values and lower peak temperature (T(p)) compared with non-acid-hydrolyzed RS. R values, the difference between completion and initial temperatures, and deltaH of RS increased by HMT. The X-ray diffraction patterns of potato and sweet potato RS isolated from partially acid-hydrolyzed starch with autoclaving-cooling showed distinct sharp peaks at 15, 25, 27, and 28 degrees, which decreased by HMT.

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