ISHS Acta Horticulturae 485: International Symposium Effect of Pre- & Postharvest factors in Fruit Storage
EFFECT OF SHORT ANOXIA EXPOSURE ON METABOLIC CHANGES OF PERSIMMON FRUITS (DIOSPYROS KAKI L.) |
| Authors: | M. Zavrtanik, J. Hribar, R. Vidrih |
| Keywords: | Persimmon, de-astringency, acetaldehyde, ethanol, polyphenols |
| Abstract:
Pollination constant and astringent (PCA) persimmon fruits (Diospyros kaki L.) cvs. Fuji and Hachiya were treated in an atmosphere comprised only of CO2 or N2 at 20°C for 24 hours and then returned to normal (air) conditions at 1°C. Untreated (control) samples were kept at 20°C for 24 hours and then stored at 1°C. The concentration of acetaldehyde increased during treatment and more so with CO2 treatment than with N2. After two days fruits treated with N2 had accumulated greater amounts of ethanol than fruits treated with CO2. Anaerobic conditions promoted astringency removal in persimmon fruits. Faster astringency removal was observed in CO2-treated fruits, but CO2 treatment caused internal browning. The ratio between polymeric (water insoluble) and oligomeric (soluble) polyphenols correlated with the degree of astringency. Total phenols and the ratio between oligo- and polymeric molecules of tannin decreased during treatment. | |
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