In addition, the limit of expansion of these gas cells is related
directly to their stability, due to coalescence and the eventual loss
of gas when the bubbles collapse. The rheological properties of the
gas cells will therefore be important in maintaining stability
against premature failure during baking, and also in relation to
gas cell stabilization and gas retention during proofing, and thus
to the final structure and volume of baked product (Dobraszczyk
and Morgenstern, 2003). Two mechanisms are involved in the
destabilization of the gas cells during proofing, disproportionation
and coalescence. Disproportionation (analogous to Ostwald ripening
in emulsions) involves a proposed diffusion mechanism by
which CO2 migrates from smaller gas cells to larger ones. Gas cells
coalescence is caused by the rupture of the thin dough films, which
results in gas loss and an irregular crumb structure (Kokelaar and
Prins, 1995). Textural properties of bakery products are most often
measured, because of the strong correlation between crumb firmness
and quality and consumer acceptance. Carson and Sun (2001)
studied six types of bread and showed the existence of a strong
correlation between the instrumental results (cohesiveness,
springiness, adhesiveness) and those sensory analysis. The sensory
evaluation development is a lengthy and costly for manufacturers,
which strongly encourages correlation studies instrumentalsensory.
They would provide simple instrumental measurements
for the prediction of sensory descriptors.
In addition, the limit of expansion of these gas cells is related
directly to their stability, due to coalescence and the eventual loss
of gas when the bubbles collapse. The rheological properties of the
gas cells will therefore be important in maintaining stability
against premature failure during baking, and also in relation to
gas cell stabilization and gas retention during proofing, and thus
to the final structure and volume of baked product (Dobraszczyk
and Morgenstern, 2003). Two mechanisms are involved in the
destabilization of the gas cells during proofing, disproportionation
and coalescence. Disproportionation (analogous to Ostwald ripening
in emulsions) involves a proposed diffusion mechanism by
which CO2 migrates from smaller gas cells to larger ones. Gas cells
coalescence is caused by the rupture of the thin dough films, which
results in gas loss and an irregular crumb structure (Kokelaar and
Prins, 1995). Textural properties of bakery products are most often
measured, because of the strong correlation between crumb firmness
and quality and consumer acceptance. Carson and Sun (2001)
studied six types of bread and showed the existence of a strong
correlation between the instrumental results (cohesiveness,
springiness, adhesiveness) and those sensory analysis. The sensory
evaluation development is a lengthy and costly for manufacturers,
which strongly encourages correlation studies instrumentalsensory.
They would provide simple instrumental measurements
for the prediction of sensory descriptors.
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