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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

1,* , 2
,
1
,
1
,
1
 and
1
1 Department of Chemistry and Biotechnology, Faculty of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan 2 NTT Microsystem Integration Laboratories, 3-1 Morinosato Wakamiya, Atsugi 243-0198, Japan
* Author to whom correspondence should be addressed.
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 (CC BY 3.0).
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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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