Chemical Compositions and Antioxidant Activities of Leaves and Stalks from Different Sweet Potato Cultivars
2012
Li, Meishan, Chungbuk National University, Cheongju, Republic of Korea | Jang, G.Y., Chungbuk National University, Cheongju, Republic of Korea | Lee, S.H., Chungbuk National University, Cheongju, Republic of Korea | Woo, K.S., National Institute of Crop Science, RDA, Milyang, Republic of Korea | Sin, H.M., Chungbuk Agricultural Research and Extension Services, Cheongwon, Republic of Korea | Kim, H.S., Chungbuk National University, Cheongju, Republic of Korea | Lee, J.S., Chungbuk National University, Cheongju, Republic of Korea | Jeong, H.S., Chungbuk National University, Cheongju, Republic of Korea
This study was conducted to evaluate the vegetative value of sweet potato leaves and stalks by investigating their chemical composition and antioxidant activity. The major minerals were found to be Ca and K. The crude protein content of the leaves ranged from 15.57% in Geonpungmi to 20.34% in Yeonhwangmi, while that of stalks was between 3.71% in Yulmi and 5.97% in Sinchunmi. The total phenolics and flavonoids content of the leaves were about 3.0~4.0 times higher than those of stalks. The levels of polyphenols and flavonoids were high in Geonpungmi leaf and in Sinchunmi stalk. ABTS radical activities were high in Geonpungmi leaf (58.75 mg AA eq/g) and in Daeyumi stalk (14.95 mg AA eq/g). DPPH radical scavenging was high in Geonpungmi and Jeungmi leaves (IC∧50, 0.11 mg/mL) and in Sinchunmi stalk (IC∧50, 1.09 mg/mL).
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