Effect of Storage Temperature on Vitamin C Levels and L-Galactonolactone Dehydrogenase Activity of Potato Tubers
1998 Volume 45 Issue 8 Pages 510-513
Details
1998 Volume 45 Issue 8 Pages 510-513
When tubers of potatoes (Solanum tuberosum L. cv. Irish Cobbler and cv. Kitaakari, a variety of high Vitamin C content) were stored at 4°C within 10 days after the harvest at about 23°C, both Vitamin C (ascorbic acid, AsA) content and the activity of L-galactono-r-lactone dehydrogenase (EC 1.3.2.3, GLDHase) increased after 2 days, and decreased thereafter. When tubers of 6 caltiver varieties including cv. Irish Cobbler, cv. May Queen, cv. Kitaakari, cv. Tsunika, cv. Touya and cv. Hokkai 79 were stored at 4°C, a marked decrease in the AsA content and an increase in GLDHase activity were observed in comparison with storage at 15°C. These results suggested that AsA was supplied by the increased GLDHase activity, while a large amount of AsA was exhausted by a strong low temperature stress.
