The columns of descriptive terms found in the positive part of the Y
axis or Standardized Coefficients axis are considered positively
important for acceptance of the mango nectar, whereas columns
found in the negative part of the Y axis represent attributes whose
presence and intensity were negative for sample acceptance.
The size of the columns represents the influence of the attribute in
acceptance of the sample, both positively and negatively. Thus the larger
the column the greater the influence of the descriptive term on the
result for acceptance of that mango nectar sample. In addition it should
be observed that if the standard deviation crosses the Y axis, this
indicates that the influence of the attribute cannot be considered with
an interval of confidence of 95% (black columns). The columns of
attributes that affect the acceptance positively are colored in blue and
the columns of attributes that affect the acceptance negatively are
colored in red.
The PLS regression of data allows for the identification of which
attributes, in the intensities presented, influenced acceptance of the
mango nectar samples positively or negatively in an interval of
confidence of 95% in each evaluation time. Sweet aftertaste and bitter
aftertaste affect the acceptance negatively in Day zero. Those attributes
are not expected in mango nectar but are common when sucrose
replacers are used (Cadena & Bolini, 2011). At 60th day of storage,
acid aroma and acid taste, attributes related to the deterioration of the
samples, affect the acceptance negatively, even as sweet aftertaste. At
the end of the study, at 120th day, only bitter aftertaste affected the
sample acceptance negatively. Probably with the increase in all samples,
sensory attributes related to sample deterioration did not influence the
sample acceptance with an interval of confidence of 95%.
Fig. 3 shows the results obtained in the PREFMAP in each evaluation
time. The consumers (circles) were close to the samples (squares) that
had the largest acceptance means. Initially at Day zero (Fig. 3a), Sucrose
(control sample), Sucralose and Neotame were the samples with the
largest concentration of consumers around. However, over the
PREFMAP at Day zero, it was noted that some consumers are close to
samples Blend and Stevia suggesting that these people preferred the
mango nectar samples sweetened with these sweeteners. In addition,