Search National Agricultural Library Digital Collections

NALDC Record Details:

Functionality of chemically modified wild-type, partial waxy and waxy starches from tetraploid wheats

Permanent URL:
http://handle.nal.usda.gov/10113/42027
File:
Download [PDF File]
Abstract:
Partial waxy (reduced-amylose) and fully waxy (amylose-free) tetraploid durum wheats (Triticum turgidum L. var durum) were developed by introgression of null alleles at the Wx-A1 and Wx-B1 loci from common hexaploid wheat (Triticum aestivum L.). Purified starches were obtained from each genotype, and chemically modified by: 1) cross-linking with phosphorus oxychloride, 2) substitution with propylene oxide, and 3) sequential cross-linking with phosphorus oxychloride followed by substitution with propylene oxide. Functional properties were compared to blends of waxy and wild-type durum starches of known amylose contents. Significant differences in functionality were observed amongst the genotypes and blends after each modification. Waxy (0% amylose) and wild-type (30% amylose) typically were at the extremes of the observed ranges of functional properties. In general, the functional properties of the chemically modified starches were dependent upon amylose content. Starches from Wx-B1 null lines (24% amylose), were an exception. After substitution, such starches had the significantly highest value for RVA final viscosity, and generally performed in a manner similar to starch blends of 12–18% amylose.
Author(s):
Hansen, L.E. , Jackson, D.S. , Wehling, R.L. , Graybosch, R.A.
Subject(s):
Triticum turgidum subsp. durum , durum wheat , interspecific hybridization , Triticum aestivum , introgression , alleles , wheat starch , carbohydrate content , amylose , crosslinking , viscosity , modified starch , functional properties
Format:
p. 409-414.
Note:
Includes references
Source:
Journal of cereal science 2010 May, v. 51, issue 3
Language:
English
Year:
2010
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
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.