Pregelatinized WMS addition had a pronounced effects on the
physicochemical properties and stability of model emulsions prepared
with DEY and SC. The contribution of SC to yield smaller
particles in model emulsions at studied WMS concentration range
was found to be more prominent than DEY. The quadratic polynomial
models were found to be appropriate for the prediction of
total color difference. Particularly visible effects of WMS on tested
textural features were observed in samples containing 4 wt%
hydrocolloid. All studied model emulsions demonstrated non-
Newtonian shear-thinning flow behavior with yield stress (s0),
and the pseudoplasticity was affected by both WMS concentration
and ET. The quadratic polynomial and exponential functions were
obtained for consistency coefficient (K) and s0, irrespectively of the applied ET. WMS addition increased values of storage (G0) and loss
(G00) moduli, whereas decreased loss tangent (tan d), particularly
evidently in samples containing 3.0 wt% polysaccharide. Emulsions
containing 2.0 wt% WMS showed liquid character (G00 > G0),
whereas those composed of 3.0 wt% WMS demonstrated structure
formation (G0 > G00). Higher values of ESC and FHC yielded SCthan
DEY-stabilized samples containing 4.0 wt% WMS. The relationship
between WMS concentration and ESC was described by
exponential and quadratic polynomial functions in DEY- and SCstabilized
emulsions, respectively. The G0 modulus and Bohlin’s
parameters can be used as indicators by evaluation physical stability
of the emulsion. Summarizing: (i) pregelatinized WMS can be
applied as alternative thickener in low-fat emulsions instead of
non-starch hydrocolloids, (ii) the recommended WMS concentration
to stabilize low-fat emulsions (w20 wt% oil) should be between
4.0 and 5.0 wt%, and (iii) presented results can have
important implications for rational designing high quality food
emulsions.
References
Pregelatinized WMS addition had a pronounced effects on the
physicochemical properties and stability of model emulsions prepared
with DEY and SC. The contribution of SC to yield smaller
particles in model emulsions at studied WMS concentration range
was found to be more prominent than DEY. The quadratic polynomial
models were found to be appropriate for the prediction of
total color difference. Particularly visible effects of WMS on tested
textural features were observed in samples containing 4 wt%
hydrocolloid. All studied model emulsions demonstrated non-
Newtonian shear-thinning flow behavior with yield stress (s0),
and the pseudoplasticity was affected by both WMS concentration
and ET. The quadratic polynomial and exponential functions were
obtained for consistency coefficient (K) and s0, irrespectively of the applied ET. WMS addition increased values of storage (G0) and loss
(G00) moduli, whereas decreased loss tangent (tan d), particularly
evidently in samples containing 3.0 wt% polysaccharide. Emulsions
containing 2.0 wt% WMS showed liquid character (G00 > G0),
whereas those composed of 3.0 wt% WMS demonstrated structure
formation (G0 > G00). Higher values of ESC and FHC yielded SCthan
DEY-stabilized samples containing 4.0 wt% WMS. The relationship
between WMS concentration and ESC was described by
exponential and quadratic polynomial functions in DEY- and SCstabilized
emulsions, respectively. The G0 modulus and Bohlin’s
parameters can be used as indicators by evaluation physical stability
of the emulsion. Summarizing: (i) pregelatinized WMS can be
applied as alternative thickener in low-fat emulsions instead of
non-starch hydrocolloids, (ii) the recommended WMS concentration
to stabilize low-fat emulsions (w20 wt% oil) should be between
4.0 and 5.0 wt%, and (iii) presented results can have
important implications for rational designing high quality food
emulsions.
References
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