complete randomized design were employed, respectively.
The data were analyzed using SPSS, ANOVA, and Duncan
test (p<0.05). For sensory evaluation, statistical analysis of
quantitative data was performed using SPSS, ANOVA, and
Duncan test (p<0.01). All experiments were replicated at
least three times (n=3).
Results and discussion
Effect of LH on unfrozen mix and frozen ice cream
The influences of lactose hydrolysis at different levels on
some physical and rheological properties of ice cream mixes
are listed in Table 1. As it can be seen, the degree of lactose
hydrolysis had no significant effect on surface tension
and density (p>0.05) while it showed paramount effect
(p<0.05) on freezing point and apparent viscosity.
The surface tension of ice cream mixes normally varies
between 46 and 53 mN/m depends on the composition,
temperature, and freshness of ingredients. But in the present
study, these parameters were almost constant (despite the
conversion of lactose to glucose and galactose). Therefore,
various levels of lactose hydrolysis did not affect (p>0.05)
these variables (density and surface tension). In line with
our findings, other researchers also reported that lactose
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