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Molecules 2010, 15(5), 2980-2993; doi:10.3390/molecules15052980
Article

UV-B Induced Changes in the Secondary Metabolites of Morus alba L. Leaves

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1 The Key Laboratory of Biomedical Engineering Ministry of Education, Department of Biomedical Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China 2 College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, Zhejiang, China 3 Department of Biological Sciences, University of Wisconsin—Milwaukee, Milwaukee, WI 53211, USA
* Authors to whom correspondence should be addressed.
Received: 28 January 2010 / Revised: 4 April 2010 / Accepted: 8 April 2010 / Published: 27 April 2010
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Abstract

Ultraviolet-B (UV-B) radiation is harmful to plants and human beings. Many secondary metabolites, like flavonoids, alkaloids, and lignin, are UV-B absorbing compounds, which can protect the genetic material of plants. Furthermore, they are active components of herbal drugs. UV-B radiation can activate the self-protective secondary metabolism system. The results of this paper provide a method to induce bioactive secondary metabolites from mulberry leaves (Morus alba L.) by UV-B irradiation in vitro. Five significantly different chromatographic peaks were found by HPLC fingerprint after induction, from which two active compounds were identified: One was chalcomoracin, a natural Diels-Alder type adduct with antibacterial activity; the other one was moracin N, which is a precursor of chalcomoracin. Their contents were 0.818 mg/g and 0.352 mg/g by dry weight, respectively.
Keywords: UV radiation; chalcomoracin; moracin N; Diels-Alder type adducts; mulberry leaves UV radiation; chalcomoracin; moracin N; Diels-Alder type adducts; mulberry leaves
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Gu, X.-D.; Sun, M.-Y.; Zhang, L.; Fu, H.-W.; Cui, L.; Chen, R.-Z.; Zhang, D.-W.; Tian, J.-K. UV-B Induced Changes in the Secondary Metabolites of Morus alba L. Leaves. Molecules 2010, 15, 2980-2993.

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