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Published on: January 22, 2018
Impact of fermentation regime and metabolically defined LAB consortia on sourdough bread nutritional and volatile
Bilal Sajid Mushtaq1, Olga Nikoloudaki2, Fulvia Trapani3
1Faculty of Agricultural, Environmental and Food Sciences, Free University of Bolzano, 39100 Bolzano, Italy.
Abstract:
This study investigated whether a metabolically characterized lactic acid bacteria consortium could be effectively applied in a propagated Type IV sourdough system and how it compared with conventional sourdough starters under different fermentation regimes. Six breads produced by Type II and propagated sourdough processes, with or without bacterial protease, were compared with baker's yeast bread. Despite the shorter fermentation time, breads made with the defined consortium showed in vitro protein digestibility, predicted glycemic index, amino acid composition, and protein quality indices within the range of conventional sourdough breads. Volatile profiling revealed a shared sourdough-associated pattern dominated by organic acids and unsaturated alcohols, while also indicating a distinct Type IV profile linked to relatively greater contributions of acetic acid, (E)-2-hexenol, (E,E)-2,4-decadien-1-ol, and 1-octen-3-ol. Multivariate integration further showed that the defined consortium promoted a more acidification-associated and compositionally differentiated bread phenotype.
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