Photostability of Iiovaline and its precursor 5-Ethyl-5- methylhydantoin exposed to simulated space radiations.
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.
Department of Chemistry and Biotechnology, Faculty of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
Palash K
PK
Sarker
NTT Microsystem Integration Laboratories, 3-1 Morinosato Wakamiya, Atsugi 243-0198, Japan.
Jun-Ichi
JI
Takahashi
Department of Chemistry and Biotechnology, Faculty of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
Yukinori
Y
Kawamoto
Department of Chemistry and Biotechnology, Faculty of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
Yumiko
Y
Obayashi
Department of Chemistry and Biotechnology, Faculty of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
Takeo
T
Kaneko
Department of Chemistry and Biotechnology, Faculty of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
Kensei
K
Kobayashi
D000409:Alanine / Q000737:chemistry; D001224:Aspartic Acid / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid; D056148:Chromatography, Reverse-Phase; D005720:Gamma Rays; D006827:Hydantoins / Q000032:analysis / Q000737:chemistry*; D010782:Photolysis; D012694:Serine / Q000737:chemistry; D014466:Ultraviolet Rays; D014633:Valine / Q000032:analysis / Q000737:chemistry*
D006827:Hydantoins; D001224:Aspartic Acid; D012694:Serine; C032737:isovaline; C047589:5-methylhydantoin; D014633:Valine; D000409:Alanine