3.3. Vitamin C, TA and soluble protein content
As shown in Table 2, changes in vitamin C were negatively
related to the period of storage, and this reduction was effectively
inhibited by low temperatures. Samples kept at 6 and 10 ◦C delayed
the loss of vitamin C compared with fruit of storage at 25 ◦C and
significant differences were found between low and room temperatures
at 6-day storage. Meanwhile, storage at 6 ◦C showed
significant effects on vitamin C content also on day 6 in comparison
with samples held at 10 ◦C.
Changes in TA during storage at 6 and 10 ◦C were relatively small,
and with no great effect on TA in fruit of storage between different
conditions. While TA values in fruit of storage at 25 ◦C raised
first and thereafter sharply declined, and then significant difference
occurred between low temperature storage and room controls with
respect to TA of fruit (Table 2).
Data of present study showed that storage temperatures have
great effects on soluble protein content in pineapple fresh. Concerning
the differences of samples stored among the three different
temperatures, fruit kept at 6 ◦C had higher protein content than
samples of storage at 10 and 25 ◦C. For example, the highest protein
content was found in storage at 6 ◦C followed by 10 ◦C, and then
25 ◦