Influence de la formulation de pâtes de farine de blé sur leur consommation d'oxygène et leur production de dioxyde de carbone au cours du pétrissage et de la fermentation : Conséquences biochimiques et rhéologiques

Abstract : Kneading and fermentation of dough are two key steps in bread making. During kneading, incorporated oxygen into dough supplies in oxidizing substrate oxidation reactions, most of them are enzymatic, leading to the development of gluten and arabinoxylans networks giving dough viscoelastic properties and its ability to gas retention. During fermentation, the production of carbon dioxide by yeast determines the volume increase of the dough. An airtight knerder-fermenter, the sitoxygraphe, has been used to quantify, at any moment during of kneading and fermentation, oxygen consumption and carbon dioxide production by distinguishing the part of CO2 that is retained by dough from that which appears in the gas phase. A modification of dough formulation prepared with wheat flour - by adding one or a mix of, yeast, oses oxidases, horse bean or soybean flour, lipases - increases oxygen consumption and affects its content of polyunsaturated fatty acids, its protein aggregation and its rheological properties. For example, there is a competition for the use of oxygen between the yeast, which breathes during kneading and endogenous or exogenous oxidoreductases. It results in a decrease of rheological and biochemical effects of exogenous oxidoreductases. The use of atmospheres enriched with oxygen at the beginning of kneading should allow limiting these competitions and amplifying exogenous oxidoreductases activity.
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François Buche. Influence de la formulation de pâtes de farine de blé sur leur consommation d'oxygène et leur production de dioxyde de carbone au cours du pétrissage et de la fermentation : Conséquences biochimiques et rhéologiques. Alimentation et Nutrition. AgroParisTech, 2011. Français. ⟨NNT : 2011AGPT0033⟩. ⟨tel-01127574⟩

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