Contents of beta-carotene and alpha-tocopherol of sweetpotato cultivars newly developed for processing purposes
1998
Okuno, S. | Yoshimoto, M. | Kumagai, T. | Yamakawa, O. (Kyushu National Agricultural Experiment Station, Miyakonojo, Miyazaki (Japan). Dept. of Upland Farming)
Contents of beta-carotene and alpha-tocopherol in storage roots of sweetpotato cultivars newly developed for processing purposes were examined. These two compounds were simultaneously determined by high performance liquid chromatography (HPLC) using an ODS column, an isocratic methanol mobile phase, and both a UV-visible and a spectrofluorometric detector. Under normal cultivation conditions without mulching, Kyushu 122 had the highest content of beta-carotene among the orange-fleshed cultivars tested, and Tanegashimamurasaki had the highest content of alpha-tocopherol among the purple-fleshed cultivars. The alpha-tocopherol content of the purple-fleshed cultivars on a fresh weight basis was higher than that of the orange-fleshed ones, while Koganesengan, a yellow-fleshed cultivar, was the richest in alpha-tocopherol content of all the cultivars tested. A similar trend was observed in cultivars grown under vinyl mulching and heavy fertilizer dressing.
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