Rate constants for KS, aspartame destruction, and
nonenzymatic browning were estimated by linear regression
analysis of data. In all cases, the statistical significance
of the regressions was evaluated through an analysis of
variance. Significant differences among kinetic rate constants
were evaluated through a covariance analysis for the
equality of the slopes. Besides, two-way ANOVA (aw level
and aspartame level or type of humectant and aspartame
level) was performed to analyze possible interactions.
Data obtained from sensory analysis were normalized.
As assessors were allowed to choose their own number
range, it was performed a rescaling procedure of each
individual data to bring them into a common range before
statistical analysis (Norma IRAM, 20018, 2002). Threeway
ANOVA was performed to know the effect of type of
sweetener and aspartame level, considered as fixed factors,
and subjects (random factor) on each type of response and
least significance difference (LSD) tests were used to
determine the sensory differences among systems.
Statistical significance was evaluated at a 5% level
(a ¼ 0.05) and the analysis were performed using the
Statgraphics computer program (Statgraphics Plus for
Windows, version 5.0,
Rate constants for KS, aspartame destruction, and
nonenzymatic browning were estimated by linear regression
analysis of data. In all cases, the statistical significance
of the regressions was evaluated through an analysis of
variance. Significant differences among kinetic rate constants
were evaluated through a covariance analysis for the
equality of the slopes. Besides, two-way ANOVA (aw level
and aspartame level or type of humectant and aspartame
level) was performed to analyze possible interactions.
Data obtained from sensory analysis were normalized.
As assessors were allowed to choose their own number
range, it was performed a rescaling procedure of each
individual data to bring them into a common range before
statistical analysis (Norma IRAM, 20018, 2002). Threeway
ANOVA was performed to know the effect of type of
sweetener and aspartame level, considered as fixed factors,
and subjects (random factor) on each type of response and
least significance difference (LSD) tests were used to
determine the sensory differences among systems.
Statistical significance was evaluated at a 5% level
(a ¼ 0.05) and the analysis were performed using the
Statgraphics computer program (Statgraphics Plus for
Windows, version 5.0,
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