observed that soy bread had a
lower amylopectin recrystallization with respect to wheat bread
samples when taking into account the lower amylopectin content
in the soy bread. Similarly, in this study, the formulations studied
contained nearly the identical amylopectin contents, yet the rate
and extent of amylopectin crystallization differed. Zeleznak and
Hoseney (1987) reported that starch crystallinity is controlled by
the water present during retrogradation, with maximum crystal
formation at moisture contents of 40–50%. Moisture contents of
the soy bread samples were in this range and it is possible that
the high affinity of soy components for water (higher water holding
capacity) resulted in less water available for the starch component
to recrystallize. In this respect the addition of soy soluble fibre
and soy protein isolate samples may have increased the water
holding capacities and decreased retrogradation to some extent
with respect to the control soy bread, whereas insoluble fibre addition
had an opposing effect. According to Ryan et al. (2002), hydrated
soy fractions in bread interacted strongly with starch,
interfering with the ability of the soy protein to form complexes
with the gluten fraction. This finding suggests that the soy protein/
starch interactions precluded starch/starch interactions hindering
amylopectin recrystallization during storage.
observed that soy bread had alower amylopectin recrystallization with respect to wheat breadsamples when taking into account the lower amylopectin contentin the soy bread. Similarly, in this study, the formulations studiedcontained nearly the identical amylopectin contents, yet the rateand extent of amylopectin crystallization differed. Zeleznak andHoseney (1987) reported that starch crystallinity is controlled bythe water present during retrogradation, with maximum crystalformation at moisture contents of 40–50%. Moisture contents ofthe soy bread samples were in this range and it is possible thatthe high affinity of soy components for water (higher water holdingcapacity) resulted in less water available for the starch componentto recrystallize. In this respect the addition of soy soluble fibreand soy protein isolate samples may have increased the waterholding capacities and decreased retrogradation to some extentwith respect to the control soy bread, whereas insoluble fibre additionhad an opposing effect. According to Ryan et al. (2002), hydratedsoy fractions in bread interacted strongly with starch,interfering with the ability of the soy protein to form complexeswith the gluten fraction. This finding suggests that the soy protein/starch interactions precluded starch/starch interactions hinderingamylopectin recrystallization during storage.
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