Characteristics of folic acid and polyphenol in Okinawan [Japan] sweet potato (Ipomoea batatas L.) foliage
2007
Taira, J.(Okinawa-ken. Industrial Technology Center, Uruma (Japan)) | Ohmi, N. | Uechi, K.
To utilize foliage of sweet potato (Ipomoea batatas L.) as a food material, the functional components of folic acid and polyphenol in foliage (leaf, petiole and stem) of 16 cultivars of Okinawan sweet potato were determined. The amounts of folic acid and polyphenol in eligible parts (1eaf and petiole), except in the cultivar Okinawa 100, contained higher amounts than stems and were similar to amounts of spinach. Miyanou 36 had the highest amounts of folic acid. Folic acid in Bise harvested in summer was higher than that of the spring sample. Harukogane, contained the highest amounts of polyphenol, while Okihikari and Ayamurasaki had comparatively less polyphenol than other cultivars. Polyphenol content of Bise and Okiyumemurasaki harvested in summer increased 2-3 times compared to spring. The sweet potatoes were cultivated on main Okinawan soils (Jaagaru, shimajiri maaji and kunigami maaji); cultivation on shimajiri maaji soil tends to increase the amounts of folic acid and polyphenol in sweet potato foliage in all but a few cultivars. In Okinawa, vegetable shortages occur during summer; thus, foliage of sweet potatoes such as Bise and Okiyumemurasaki could be used as summer vegetables or processed food materials. These basic data also would provide useful information for the selection and cultivation of suitable sweet potato cultivars.
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