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Article
Thermal Properties of Starch from Selected Maize (Zea mays L.) Mutants During Development
Cereal Chemistry
  • K.Y. Ng, Iowa State University
  • Susan A. Duvick, United States Department of Agriculture
  • Pamela J. White, Iowa State University
Document Type
Article
Publication Version
Published Version
Publication Date
5-1-1997
DOI
10.1094/CCHEM.1997.74.3.288
Abstract
The changes in thermal properties of maize starches during five stages of kernel maturity, (12, 18, 24, 30, and 36 days after pollination [DAP]), from three mutant genotypes, amylose extender (ae), sugary-2 (su2), and waxy (wx) in an OH43 background, and the OH43 genotype were studied using differential scanning calorimetry (DSC). Within a genotype, DSC values of starches at 24, 30, and 36 DAP were similar to each other and often were significantly different (P < 0.05) from the values at 12 DAP, indicating possible differences in the fine structure of starch during endosperm development. For su2 starches, the gelatinization onset temperature (ToG) significantly decreased after 12 DAP and remained low throughout the study. The gelatinization range (RG) had a similar pattern. For wx starches, ToG at 18 DAP was significantly lower than at 12 DAP but tended to increase after 18 DAP. The RG increased significantly after 12 DAP and significantly decreased after 30 DAP. Thus, thermal properties of starches during early development were different from those of their mature counterparts, and differences among the mutant genotypes and the normal starch originated from the earliest endosperm development stage studied (12 DAP).
Comments

This article is from Cereal Chemistry, May 1997, 74(3); 288-292. DOI: 10.1094/CCHEM.1997.74.3.288.

Rights
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.
Language
en
File Format
application/pdf
Citation Information
K.Y. Ng, Susan A. Duvick and Pamela J. White. "Thermal Properties of Starch from Selected Maize (Zea mays L.) Mutants During Development" Cereal Chemistry Vol. 74 Iss. 3 (1997) p. 288 - 292
Available at: http://works.bepress.com/pamela_white/47/