The isolation of prophyra-334 from marine algae and its UV-absorption behavior |
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| Authors: | Zhang Zhaohui Gao Xin Yuri Tashiro Shingo Matsukawa Hiroo Ogawa |
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| Institution: | (1) Department of Food Science and Technology, Tokyo University of Marine Science and Technology, Minato, 108-8477 Tokyo, Japan;(2) Department of Food Engineering, Ocean University of China, 266003 Qingdao, China |
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| Abstract: | Prophyra-334 was prepared by methanol extraction and HPLC methods from marine algae (dried laver). It is a sunscreen compound
that has good absorption of ultraviolet radiations in the wavelength ranges of 200–400 nm. The absorption maximum wavelength
of prophyra-334 is at 334 nm, so defined the name. The molar extinction coefficient (ε) of prophyra-334 in aqueous solution
at 334 nm wavelength is 4.23×104. The absorption of prophyra-334 in organic solvents differs in aqueous solutions. In polar organic solvents, the absorption
maximum wavelength of prophyra-334 has a slight shift toward longer wavelength compared with that in pure water. On the contrary,
in inert non-polar organic solvents, the absorption maximum wavelength and the shape of absorption spectra of prophyra-334
are changed. The effects of organic solvents on prophyra-334 stability suggested that: (1) the absorbance of prophyra-334
in water is generally constant at temperature of 60°C in 24 h, meaning that prophyra-334 is quite stable in water; (2) the
absorbance of prophyra-334 in ethanol and hexane decreases at the same condition. The stability of prophyra-334 in organic
solvents is less than that in aqueous solution. In benzene, the prophyra-334 is very instable.
This study was supported by SRF for ROCS, SEM and Natural Science Foundation of Qingdao (No. 04-2-JZ-110). |
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| Keywords: | prophyra-334 extraction isolation marine algae organic solvent UV-absorption |
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