Resveratrol has been associated with reduced cardiovascular disease and reduced cancer risk. This phytochemical has been reported in a number of plant species including grapes, peanuts and pine trees in response to stress such as fungal infection, heavy metal ions or UV irradiation. The objective of this study was to determine the resveratrol contents in leaves of mulberry varieties at different collecting times. Quantitative analysis of 16 cultivars showed a range of 102~466 ㎍/100 g on dry weight basis (which is equivalent to 25~116.5 ㎍/100 g on fresh weight basis). Resveratrol contents in mulberry leaves was higher in autumn than spring, and higher in fully matured leaves than in juvenile leaves. Among the tested samples, ‘Kaeryangppong’,‘Sugeppong’ and ‘Cheongilppong’ collected in the middle of October showed high resveratrol contents of 838 ㎍/100g, 803 ㎍/100 g, 800 ㎍/100 g on dry weight basis, respectively. Especially mulberry leaves dried in the shade showed of 1,030 ㎍/100 g on dry weight basis in resveratrol content,this result may contribute to utilization of mulberry leaves.
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