A study on the simplification of removal of astringency using alkohol gas and ethylene absorbent in Japanese persimon.

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In order to develop the simple method of removal of astringency to improve flavor and quality in the excellent astringent cultivar, 'Saizyo', of Japanese persimon grown mainly in Chugoku district, the methods of removal of astringency using alkohol gas and ethylene absorbent were investigated and established in practical technique. The outline is summarized as follows.1. Method ; Powder alkohol generating ethyl alkohol gas, ethylene absorbent and persimon were sealed up with 50 um-thick polyethylene film bag during 3 to 7 days.2. Proper dose of treatment ; In 'Saizyo' fruits 24 to 30 g of powder alkohol per 5 kg and 20 g of ethylene absorbent were proper dosage.3. Temperature of treatment ; Temperature of the treatment to remove astringency are 28 to 30 ゜c during 3 days, which is the same period using dry ice, or 26 ゜c during 4 days. 6 to days were needed in ambient temperature.4. Prevention of misture injury and improvement of fruit appearance ; To prevent fruit softening and cracking of skin because of over-moisture in the film bag and to promote coloring of fruit skin, these fruits were pretreated to heat at 30 ゜c during 12 to 24 hours. Moreover, by putting the several corgated cardboard sheets in film bag to absorb moisture the injury could almost be prevented.5. By the above-menthioned treatments it is possible to produce excellent quality, flavor and appearance and imprrove keeping quality of 'Saizyo' fruit. Moreover, this method was intended for practical use in the persimon-growing district of Tottori prefecture from 1986.