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UV absorbent, marmesin, from the bark of Thanakha,Hesperethusa crenulata L.

한국식물학회지 2004년 47권 2호 p.163 ~ 165
 ( Joo Se-Hwan ) - Chung-Ang University Department of Life Science

 ( Lee Sang-Cheol ) - Chung-Ang University Department of Life Science
김성기 ( Kim Seong-Ki ) - Chung-Ang University Department of Life Science

Abstract


We used solvent extractions, SiO2 column chromatographies, and HPLC to isolate from the bark of Thanakha (Hesperethusa crenulata L) an active crystalline compound for absorbing UV-A radiation (320 to 380 nm). Analyses of low-and high-resolution FAB-MS revealed a compound, named marmesin, with a formula of C14H14O4 and a molecular mass of 246. To determine its chemical structure, we conducted 300 MMz NMR analyses using various probes,1H,13C, and DEPT13C. Our NMR data showed a structure of 2,3-dihydro-2(1 -hydroxy-1 -methylethyl)-furanocoumarin. This active compound contains UV-absorbing chromophores, an aromatic ring, a double bond at C3-C4, and a carbonyl at C2. Its λmax is 335 nm, indicating that marmesin could be commercially useful as a natural UV-A-filtering product

키워드

marmesin; Thanakha (Hesperethusa crenulata L); UV-A-absorbent
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