| Sweet persimmon imported from Japan from the last century has been cultivated on a large scale in our country. But its further development has been restricted on account of lack of assorted fresh-keep and storage technique and standard commercialization processing as well. In this paper, sweet persimmon's picking time in different latitudes along with ripening point of picking and Simple Controlled Atmospheres Cold Storage Technique of sweet persimmon was studied. The results are:1. Sweet persimmon's picking time varied greatly from latitude to latitude. The limited factor was time of completely losing puckery. It lost puckery earlier at lower latitude; while later at higher latitude. The picking time at Hanzhong latitude (N33°07′) was after August,14, at Meicounty (N34°29′) latitude it was after September,13; whereas, at Fuping latitude (N34°76′) it was as late as October 13.2. If the ripening point of the cold stored post-harvest persimmon did not reach 8 maturities and the content of TSS was not less than 12%, cold damage would very likely occur.3. PGS, a kind of enzymes playing an important role in the change of the structure of cell walls, could catalyze the splitting of polygalacturonicacid in pectin so as to get involved in the pectin degradation in view of being closely related to fruit softening. Besides, PGs consists of two or three kinds of isoenzymes (CK-MB) which appears during different fruit development periods. Storage measures, such as storage in controlled atmosphere, heat treatment as well as Calcium treatment could inhibit the activity of PG enzyme and thus delayed fruit senescence.4. At 1±0.5℃temperature the time of keeping sweet persimmon firm was 60d if PE package and KGM (Konjan Glucomana) coating and its application to the storage of sweet persimmon were used. Whereas, it could reach 90d if the simple MA storage method made up of gibberellins ethylene absorbent combined with preservative films was applied to retain freshness. |
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