Browning of fruit is affected by several elements
such as environment, storage, each cultivar, each maturity
degree, etc. This study was to review effects of the
PPO(Polyphenol oxidase) activity and total phenolics contents
on browning and quality of dried-persimmon according to
maturity degree of astringent persimmon.
Chromaticity value a in dried persimmon of ripe fruit and full
ripe fruit were higher than unripe fruit. In case of soluble
sugar contents, full ripe fruit was 50° Brix, the highest degree
while unripe fruit was 40° Brix, the lowest degree.
PPO activation degree of unripe fruit was 4.7, which was
higher than ripe fruit of 0.7 and full ripe of 1.0. There was no
difference in PPO activation degree among treatment and
PPO activation remained even while drying.
Total phenol contents of unripe fruit was 101.4, which was
higher than ripe fruit of 57.5 and full ripe fruit of 67.4. Total
phenol contents level was higher as drying period went by,
which was based on fresh weight.
Hardness of unripe fruit and ripe fruit continued to
decrease until three weeks while softening went on. After that,
Hardness was high and it started drying. Hardness of full ripe
fruit began to increase after two weeks. Softening of full ripe
fruit was fastest during drying period and weight reduction
rate was lower than unripe fruit and ripe fruit.