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In order to control blackening of pericarp during removal of astringency in kaki fruits y ethanol treatment, super-absorbent polymer sheets were applied, using Hiratanenashi, ne of the principal varieties of astringent cultivars in Japan.1. By adding 38%(V/V) ethanol solution to the super-absorbent polymer sheet B that had igh absorbing ability, both the rate and the degree of blackening of pericarp were arkedly reduced, compared with the control treatment, spraying of 38%(V/V) ethanol olution alone. However, the blackening of pericarp of the highest kaki fruits was not educed.2. Blackening of pericarp was not reduced by employing the super-absorbent polymer heet hat had a lower absorbing ability or spraying 38%(V/V) ethanol solution to the uper-absorbent polymer sheet B that had a high absorbing ability.3. Blackening was not prevented by employing the super-absorbent polymer sheet B in a ase of corrugated cardboard that was closed up more tightly than the ordinary one.4. When 38%(V/V) ethanol solution was absorbed into the super-absorbent polymer sheet, he astringency disappeared slowly, compared with ordinary spraying.5. It was suggested that the effect of the super-absorbent polymer sheet B having a igh bsorbing ability on the control of blackening of pericarp was due both to the proper oncentration of gaseous ethanol, so that 38%(V/V) ethanol solution came in contact with he pericarp of persimmon, and to the prevention of high humidity conditions in the orrugated cardboard.

Studies on the Control of Blackening of Pericarp in the Process of Ethanol Treatment for Removal of the Astringency in Japanese Persimmon