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Furusho, A.* ; Ishii, C.* ; Akita, T.* ; Oyaide, M.* ; Mita, M.* ; Naraoka, H.* ; Takano, Y.* ; Dworkin, J.P.* ; Oba, Y.* ; Koga, T.* ; Fukushima, K.* ; Aoki, D.* ; Hashiguchi, M.* ; Mita, H.* ; Chikaraishi, Y.* ; Ohkouchi, N.* ; Ogawa, N.O.* ; Sakai, S.* ; Glavin, D.P.* ; Elsila, J.E.* ; Parker, E.T.* ; Aponte, J.C.* ; Mclain, H.L.* ; Orthous-Daunay, F.R.* ; Vuitton, V.* ; Thissen, R.* ; Wolters, C.* ; Schmitt-Kopplin, P. ; Ruf, A.* ; Isa, J.* ; Hertkorn, N. ; Eiler, J.M.* ; Yoshimura, T.* ; Sugahara, H.* ; Graham, H.V.* ; Furukawa, Y.* ; Araoka, D.* ; Tanaka, S.* ; Yoshikawa, T.* ; Kabashima, F.* ; Sasaki, K.* ; Sato, H.* ; Yamazaki, T.* ; Onose, M.* ; Morita, M.* ; Kimura, Y.* ; Kano, K.* ; Aoki, J.* ; Fujishima, K.* ; Nomura, S.i.M.* ; Tachibana, S.* ; Nakamura, T.* ; Noguchi, T.* ; Okazaki, R.* ; Yabuta, H.* ; Yurimoto, H.* ; Sakamoto, K.* ; Yada, T.* ; Nishimura, M.* ; Nakato, A.* ; Miyazaki, A.* ; Yogata, K.* ; Abe, M.* ; Usui, T.* ; Yoshikawa, M.* ; Saiki, T.* ; Terui, F.* ; Nakazawa, S.* ; Okada, T.* ; Watanabe, S.i.* ; Tsuda, Y.* ; Hamase, K.*

Enantioselective three-dimensional high-performance liquid chromatographic determination of amino acids in the Hayabusa2 returned samples from the asteroid Ryugu.

J. Chromatogr. Open 5:100134 (2024)

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The chirality of amino acids in extraterrestrial materials may provide an insight into the origin of the essential L-enantiopure amino acids in the terrestrial biosphere. In 2020, the Hayabusa2 mission succeeded in bringing back surface materials from the C-type asteroid (162173) Ryugu to the Earth. Amino acids were one of the targeted organic molecules to be studied in the Ryugu samples. To analyze the various structural isomers of amino acids, which were expected to be present, from the limited amount of the returned samples, the development of a highly-sensitive and selective analytical method was necessary. In the present study, a three-dimensional high-performance liquid chromatography (3D-HPLC) system has been developed for the enantioselective determination of five proteinogenic and three non-proteinogenic amino acids in the Ryugu samples, in which amino acids in the sample were separated by reversed-phase, anion-exchange and enantioselective columns after the fluorescence derivatization with 4-fluoro-7-nitro-2,1,3-benzoxadiozole. The applicability of the analytical system to the extraterrestrial samples was evaluated by analyzing several types of carbonaceous meteorites before applying the system to the Ryugu samples. In the analysis of the Ryugu samples, all of the target amino acids were successfully determined quantitatively. Non-proteinogenic amino acids including 2-amino-n-butyric acid, isovaline and norvaline, rarely present in the terrestrial environment, were found as almost racemic mixtures with 47.1 to 55.2%L.

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