Astringency was removed
from'Triumph'persimmons by immersion in water at 40°C for 5 hr or 60°C, for 1
hr. Similar treatments at 20° and 80°C, had no effect on astringency
reduction. Subsequent application of 80% CO2 for 48 hr was
effective for 20°C-treated fruit but not for 80° C-treated fruit, which
became nonastringent only after exposure to acetaldehyde. Extending the 60°C
treatment beyond 2 hr resulted in recurrence of astringency, which was not
reduced by subsequent CO2 treatment. Astringency also recurred in
CO2-treated non-astringent fruit, when exposed to high
temperatures. The disappearance and recurrence of astringency correlated with
amount of methanol-soluble tannins.