Application for 48 hr of CO 2 or N 2 , or mixtures of both, to astringent persimmon fruits, was found to be efficient in removal of astringency. Anaerobic conditions induced stimulated production of acetaldehyde and ethanol by the fruits. Ethanol production was unaffected by the different gas compositions. However, the highest level of acetaldehyde was found with the highest CO 2 concentration. The lowest acetaldehyde levels were measured in fruits treated with N 2 only. The rate of the deastringency process was positively correlated to the endogenous level of acetaldehyde attained in the fruit. However, the high acetaldehyde levels produced during CO 2 treatment of 72–96 hours evidently caused injury to the fruit pulp.
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Pesis et al. (1984) studied this question.