A Rheological Study of Wheat Starch-Water-soluble Pentosan Mixtures Under Hydrothermal Gelling Conditions

Santos, D.M.J.; Gama, A.C.; Silva, J.A Lopes Da

A Rheological Study of Wheat Starch-Water-soluble Pentosan Mixtures Under Hydrothermal Gelling Conditions

2002

Santos, D.M.J. | Gama, A.C. | Silva, J.A Lopes Da

Heterogeneous water-soluble pentosans (WSP) were extracted from 2 different wheat flours. The dynamic rheological behavior of starch-WSP mixtures was investigated to elucidate the effect of WSP on starch gelatinization and quenching the starch gels. In general, WSP had a detrimental effect on starch gelation. The decrease of water availability due to WSP may explain the observed higher onset temperature for starch gelatinization. However, the observed changes in rheological behavior during cooling and aging, and the more pronounced effects observed at excess water, suggest dependence on the WSP source and that WSP may have a more specific interacting effect with the amylose and/or amylopectin which prevents reorganization of both macromolecules within the starch network. Keywords: wheat starch, water-soluble pentosans, dynamic rheological properties, gelatinization.

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