During the studied storage time, no notable changes in clarity
were registered except in the samples obtained under conditions
B and C and stored at 4 C, in which a loss of clarity took place during the storage time. As can be seen, the storage temperature had
an influence on L⁄. Storage at room temperature produced more
luminous samples than at 4 C, especially after 49 days of storage.
The obtained results showed a reduction of the chromatic coordinates a⁄ and b⁄ as a result of the application of treatments A, B or
C. Moreover, the samples stored at 4 C presented a greater decrease in b⁄ (Fig. 2) at the end of the storage period. This decrease
of a⁄ and b⁄ parameters had an effect on the chroma
(C⁄ = [a⁄2 + b⁄2]1/2) with a marked decrease that indicates less purity in the colour of the samples.
Concerning the hue of the samples, the samples submitted to
thermal treatment (treatment A and B) achieved the highest values. These results were expected, as both fresh cut persimmon
and spreadable product C exhibited a predominance of more orange tones, whereas spreadable products treated thermally indicated a colour change to the more yellow ones. During storage
time, the hue (h = arctangent [b⁄/a]) of the samples decreased as
a consequence of the reduction of b⁄, mainly in the samples stored
at 4 C.
In accordance with the results, it could be summarised that the
application of heat (treatment A and B) mainly affected the luminosity, the coordinates a⁄ and b⁄ and also C⁄ of the samples, also,
the colour samples changed more during storage under refrigeration than at room temperature.