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Exotic Corn Lines with Increased Resistant Starch and Impact on Starch Thermal Characteristics
Cereal Chemistry
  • Kim A. Rohlfing, Iowa State University
  • Linda M. Pollak, United States Department of Agriculture
  • Pamela J. White, Iowa State University
Document Type
Publication Version
Published Version
Publication Date
10.1094/ CCHEM-87-3-0190
Ten parent corn lines, including four mutants (dull sugary2, amyloseextender sugary2, amylose-extender dull, and an amylose-extender with introgressed Guatemalen germplasm [GUAT ae]) and six lines with introgressed exotic germplasm backgrounds, were crossed with each other to create 20 progeny crosses to increase resistant starch (RS) as a dietary fiber in corn starch and to provide materials for thermal evaluation. The resistant starch 2 (RS2) values from the 10 parent lines were 18.3–52.2% and the values from the 20 progeny crosses were 16.6–34.0%. The %RS2 of parents was not additive in the offspring but greater RS2 in parents was correlated to greater RS2 in the progeny crosses (r = 0.63). Differential scanning calorimetry (DSC) measured starch thermal characteristics, revealing positive correlations of peak gelatinization temperature and change in enthalpy with %RS2 (r = 0.65 and r = 0.67, P ≤ 0.05); however, % retrogradation (a measure of RS3) and retrogradation parameters did not correlate with %RS2. The %RS2 and onset temperature increased with the addition of the ae gene, likely because RS delays gelatinization.

This article is from "Cereal Chemistry", 2010, 87(3); 190-193. DOI: 10.1094/ CCHEM-87-3-0190.

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Citation Information
Kim A. Rohlfing, Linda M. Pollak and Pamela J. White. "Exotic Corn Lines with Increased Resistant Starch and Impact on Starch Thermal Characteristics" Cereal Chemistry Vol. 87 Iss. 3 (2010) p. 190 - 193
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