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Effects of dextran with different molecular weights on the quality of wheat sourdough breads
Yao Zhang1, Lunan Guo1, Dan Xu1
1School of Food Science and Technology, Jiangnan University, 1800 Lihu Road, Wuxi 214122, PR China.
Abstract:
This research aimed at investigating the effects of different weight-average molecular weights (Mw: T10, T70, T250, T750, T2000) of dextran (α-(1 → 6)-linked linear backbone, α-(1 → 3)-linked branching) on wheat sourdough bread qualities. Texture analyzer showed that dextran contributed to a significant inhibition of bread staling, particularly dextran T2000. Pasting profiles (Rapid visco-analysis) and steady rheological properties (steady shear measurements) of samples indicated that dextran T2000 suppressed the swelling and gelatinization of wheat starch granules and bound a great amount of water, thus retarding the aging process. Dextran T2000 markedly improved the elastic properties of sourdough-containing dough. Wheat sourdough breads containing dextran T10 exhibited unexpected less firm crumb structure. The improvement of bread qualities was a function of the Mw of dextran. Dextran with high Mw values has the potential for improving the quality of wheat sourdough breads, especially extending shelf life.
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