January
2001
Volume
78
Number
1
Pages
31
—
35
Authors
Betty A.
Bugusu
,
2
Osvaldo
Campanella
,
3
and
Bruce R.
Hamaker
2
,
4
Affiliations
Paper No. 16172 from Purdue University Agricultural Research Programs.
Department of Food Science, Purdue University, 1160 Food Science Building, West Lafayette, IN 47907.
Department of Agricultural and Biological Engineering, Purdue University, ABE Building, West Lafayette, IN 47907.
Corresponding author. E-mail: hamakerb@foodsci.purdue.edu
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RelatedArticle
Accepted September 28, 2000.
Abstract
ABSTRACT
Addition of sorghum flour to wheat flour produces marked negative effects on rheological properties of dough and loaf volume. Although there are notable differences in the chemical composition of sorghum proteins (kafirins) compared with wheat gluten that might imply poor functionality in breadmaking systems, a larger constraint may be the unavailability of kafirins due to encapsulation in protein bodies. In this study, zein, the analogous maize prolamin to kafirin, was used to determine the potential effects of protein-body-free prolamins on dough rheology and baking quality of wheat-sorghum composite flour. Mixograms run at 35°C (above the glass transition temperature of zein) were significantly (P < 0.01) improved with addition of zein. Mixogram peak heights increased while mixing time decreased uniformly with addition of zein. Dough extensibility studies showed an increase in maximum tensile stress, while baking studies showed an increase in loaf volume with increasing amounts of added zein. These data are supported by a previous study showing that, in a model system, zein mixed with starch can form viscoelastic networks, and suggest that kafirin, if made available, could contribute to dough formation.
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ArticleCopyright
© 2001 American Association of Cereal Chemists, Inc.