Effects of cropping season and storage temperature on quality changes of cabbage [Brassica oleracea capitata] during short-term storage
2001
Mukasa, Y. (Hokkaido National Agricultural Experiment Station, Sapporo (Japan)) | Hakoyama, S.
Post-harvest changes in quality of cabbage (cv. Kinkei 201) cultivated in different 3 cropping seasons were surveyed for 21 days under 20 deg C-dark-95% relative humidity storage condition (non-cooled) in comparison with under 4deg C-dark-95% relative humidity (refrigeratory), and the influence of cropping seasons on chemical changes during storage were investigated. During the storage, vitamin C content of cabbage increased steadily under 4 deg C condition, but fluctuated under 20 deg C. Nitrate content fluctuated over the storage period under both temperature conditions. Reducing sugar content tended to decrease and non-reducing sugar content tended to increase over the storage period, however total sugar content fluctuated under both temperature condition. Although changes in vitamin C, nitrate and sugar content were quantitatively small over the storage period, the contents were considerably influenced by the cropping seasons. In vitamin C content and nitrate content, 1.5-fold and 5-fold differences were observed respectively between cropping seasons and significant differences could be seen in total dietary fiber (TDF) content and sugar content. To improve content of profitable components in cabbage, sophisticated pre-harvest cultivating techniques such as fertilizing method depending on cropping seasons would be necessary. On the other hand, the color of outer head leaves affected by chlorophyll content rapidly changed after the 8th day of storage under 20 deg C, though it was almost unchanged under 4 deg C. For keeping freshness of cabbage under non-cooled condition, it was suggested that preventing chlorophyll breakdown would be primarily needed.
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