Effects of astringency removal by different methods on softening of persimmon fruits

• Main Authors: Ruey-Jane Tsai, 蔡瑞真
• Other Authors: Ching-Chang Shiesh; Kuo-Chung Lee
• Format: Others
• Language: zh-TW
• Published: 1994
• Online Access: http://ndltd.ncl.edu.tw/handle/11053808467158466313

碩士 === 國立中興大學 === 園藝學系 === 82 === The objective of this study was to investigate the relative effectiveness of the methods and todetermine the physiological changes leading to the softening of the fruit in the process of deastringency. Persimmon fruits when treated with carbon dioxide had the fastest rate of softening as well as ethylene production. In carbon dioxide treated fruits, the highest ethylene evolution and internal concentration were in good agreement with the high activity of ethylene forming enzyme(EFE) and the content of ACC. Calcium oxide suspension treatment resulted in highest pH value and high calcium concentration in the fruit intercellular space but the firmness of fruit was changed. In conclusion,evidences suggested that calcium concentration in fruits was not the main factor affecting the softness of per- simmon while ethylene which initiated the ripening process,could also play animportant role in the softening of persimmon fruits. Summary (2) The purpose of this study was to investigate the optimal storage temperatureand some related physiological changes that occur in the processof deastringency in cold storage. Results indicated that persimmon fruits after calcium oxide treatment and stored at a relatively low temperature (2℃) showed symptom of browning of mesocarp. In order to extend the shelf life of persimmon fruit after deastringency,it should not be stored below 13℃.Besides, the browning of mesocarp could be reduced effectivelly if storing was postponed 24 hours after calcium oxide treatment. It was also found that the degree of maturity was negatively correlated with browning: the more ripened fruits displayed relatively less browning symptom. In conclusion, the persimmon fruits after deastringency was not able to tolerate low temperature storage.