Study On Application Technique Of CO₂ De-astringency And Preservative 1-MCP To 'Gongcheng' Persimmon

Persimmon fruits are easily browning,softening and rot after de-astringency,which extremely limits the logistics of persimmon,also restricts the development of persimmon industry.According to the current situation of postharvest handling on Guangxi 'Gongcheng' persimmon,that,there is a lack of industry standard for persimmon de-astringency and preservation technology,this study aims to provide evidences for the standardization of persimmon storage and preservation.In this paper,the effect of high concentration CO₂ de-astringency and influence of 1-methylcyclopropene?1-MCP?,an inhibitor of ethylene action during de-astringency,on fruit freshness,were studied.Suitable treatment period of CO₂ treatment and treatment concentration of 1-MCP were selected,and the results are as follows.?1?The treatment time of CO₂?95%?de-astringency had a significant effect on the changes of content of tannin in persimmon fruit.In the range of 24-72h,the longer the time was,the more rapidly the content of tannin decreased,however,titratable acid content and ascorbic acid decreased faster,and fruit soften easier.Among 24h,48h and 72h CO₂ de-astringency treatments,72h had the best astringency removal effect,but most fruit softened in a short period?12d after treatment?,so under the comprehensive consideration of fruit hardness,color,nutrient and other storage quality,48h treatment fruit have higher storability and fruit quality,which is more suitable for the long distance?2?48h de-astringency treatment with high concentration CO₂ combined with 1-MCP application showed that the decrease in the hardness of the persimmon after storage was slow down,which suggested that 1-MCP had preservation effect on the de-astringent persimmon.?3?The results of screening the 1-MCP effective concentration showed that,among the 1-MCP treatments at concentrations of 1 ppm,5 ppm and 10 ppm,?storage temperature was 20± 5??,treatment with 1 ppm had the best preservation effect,tannin content decreased stably,de-astringent effect could be ensured.In summary,the 48h high concentration CO₂ de-astringency with the combination of lppm 1-MCP treatment can remove astringency well and keep fruit freshness,which has a broad application prospect for postharvest handling in the chain of persimmon industry.