Abstract
Fruits of 13 and 12 astringent Oriental persimmon ( Diospyros kaki Thunb.) cultivars of Japanese and Chinese origin, respectively, were treated with carbon dioxide (CO 2) gas or ethanol (EtOH) vapor to remove astringency. The treatments can remove the astringency of ‘Hiratanenashi’ fruit, a leading cultivar in Japan. Assuming the threshold for human perception of astringency to be 1.0 mg/gfw of soluble tannin in the flesh, eight Chinese and seven Japanese cultivars were below the threshold after the CO 2 treatment and only two Chinese and one Japanese cultivar were below it after the EtOH treatment. The effects of cultivar, treatment and the cultivar×treatment interaction were highly significant. The CO 2 treatment reduced the soluble tannin content more easily than the EtOH treatment. The soluble tannin content in 10 cultivars was significantly less after the CO 2 treatment than after the EtOH treatment, whereas in no cultivars it was less after the EtOH treatment than after the CO 2 treatment. Reduction of soluble tannin content by the treatments was not clearly different between cultivars of Chinese and those of Japanese origin. The soluble tannin content after the treatment was not related to the soluble tannin content before treatment or to fruit weight. These results showed that for many cultivars, astringency could not be removed easily by the treatments, especially the EtOH treatment.
Published Version
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