Publication no. C-2004-0129-01R |  VIEW ARTICLE

Effect of Partial Acid Hydrolysis and Heat-Moisture Treatment on Formation of Resistant Tuber Starch.

SangIck Shin (1), Jaeeon Byun (1), Kwan Hwa Park (1), and Tae Wha Moon (1,2). (1) National Laboratory for Functional Food Carbohydrate, School of Agricultural Biotechnology, and Center for Agricultural Bio-materials, Seoul National University, Seoul 151-742, Korea. (2) Corresponsing author. Phone: 82 2 880 4854. Fax: 82 2 873 5095. E-mail: <twmoon@snu.ac.kr> Cereal Chem. 81(2):194-198. Accepted October 16, 2003. Copyright 2004 American Association of Cereal Chemists, Inc.

Structural characteristics of resistant starch (RS) were investigated. Tuber starches, hydrolyzed with 1N HCl at 35°C for 8 hr followed by autoclaving-cooling treatment, were heated at 100°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°, which decreased by HMT.