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Int. J. Mol. Sci. 2012, 13(1), 1006-1017; doi:10.3390/ijms13011006
Article

Photostability of Isovaline and its Precursor 5-Ethyl-5-methylhydantoin Exposed to Simulated Space Radiations

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Received: 9 November 2011 / Revised: 4 January 2012 / Accepted: 9 January 2012 / Published: 17 January 2012
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Abstract

Aqueous solutions of isovaline and its precursor molecule, 5-ethyl-5-methylhydantoin, were irradiated with ultraviolet and γ-ray photons, to evaluate their structural stability against space radiation. The degree of photolysis was measured and irradiation products were identified using chiral, reversed-phase and ion-exchange high-performance liquid chromatography. The experimental results show that the degree of photolysis of 5-ethyl-5-methylhydantoin is more significant than that of isovaline under ultraviolet light irradiation, while the results under γ-ray irradiation are the opposite. As the products of isovaline photolysis, aspartic acid, serine, glutamic acid and alanine were dominantly detected.
Keywords: isovaline; space radiation; ultraviolet light; gamma ray; photolysis isovaline; space radiation; ultraviolet light; gamma ray; photolysis
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Sarker, P.K.; Takahashi, J.-I.; Kawamoto, Y.; Obayashi, Y.; Kaneko, T.; Kobayashi, K. Photostability of Isovaline and its Precursor 5-Ethyl-5-methylhydantoin Exposed to Simulated Space Radiations. Int. J. Mol. Sci. 2012, 13, 1006-1017.

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