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Heat treatments varying levels, of protein ionic strength, and pH in addition, to
the molecular interactions. Among, food processing which affect certain physicochemical
properties in resulting gels of commercial soy isolates (> 90% protein)
are. Discussed. Calorimetric measurements were used to describe a partially
.Denatured molecular order and conclude that temperature and the heating rate of
temperature are expected to correlate strongly. To the macromolecular conformational
changes. Structural characterisation with small deformation rheological
measurements. (elastic modulus Tan S, creep / compliance), was performed for a
series of soy protein with the temperature treatments ranging. From 30 to 90 ° C in
.An attempt to examine the mechanisms involved. Aggregate gels were observed at
lower temperatures (up to 60 ° C preheat treatment). With maximum network
rigidity which is, associated with the different degrees of 'pregelation' stages
during the production. Process. 'Disaggregation' at higher temperatures treatments
weakened the molecular association and produced, more elastic. Finestranded
gels.Essentially disulphide linkages, on heated networks and mainly
non-covalent physical forces of attraction in their cooled. Counterparts contributed
to, the nature of gels', behaviour while the involvement of hydrophobic
interaction was, negligible. Lower concentrations were more sensitive to temperature
factor. Similar conclusions on the structure and rigidity were also
.Observed from long-time creep experiments. Both covalent and non-covalent
topological interactions which are, involved. In the heated (90 ° C), network stabilisation
contributed proportionally with concentration to the viscoelastic constants
from. A six-element mechanical model. Heated protein aqueous
preparations, with urea a structure perturbing agent produced entropically,, Elastic
, networksWith, substantial homogeneity but still significant enthalpic contribution
was observed. Textural changes due to sensitivity. On ionic strength and
pH were investigated for different soy protein concentrations using texture, analysis
compression. Measurements. The presence of salt strengthened the interaggregate
forces promoted aggregation, and therefore stabilised,,, The structure of
.Partially denatured soy protein gels. Copyright 6 1996 Published by Elsevier.
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