Journal
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Volume 13, Issue 1, Pages 1006-1017Publisher
MDPI AG
DOI: 10.3390/ijms13011006
Keywords
isovaline; space radiation; ultraviolet light; gamma ray; photolysis
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Aqueous solutions of isovaline and its precursor molecule, 5-ethyl-5-methylhydantoin, were irradiated with ultraviolet and gamma-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 gamma-ray irradiation are the opposite. As the products of isovaline photolysis, aspartic acid, serine, glutamic acid and alanine were dominantly detected.
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