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Mitochondrion-selective hemicyanine dyes suitable for fiber laser excitation two-photon microscopy

  • H. Moritomo (a1), S. Onishi (a2), N. Asamura (a3), K. Matsumoto (a3), Y. Suzuki (a2) (a3) and J. Kawamata (a2) (a3)...


We investigate the two-photon absorption characteristics of hemicyanine dyes that exhibit a one-photon absorption at around 500 nm. The dyes exhibited two-photon-induced fluorescence upon irradiation with an Yb-doped femtosecond fiber laser operating at 1030 nm. Among the dyes, 4-[4-[4-(dimethylamino)phenyl]-1,3-butadienyl]-1-ethyl-pyridinium perchlorate exhibited the most efficient two-photon-induced fluorescence at 1030 nm. Since these dyes possess cationic moiety, the dyes accumulated in the mitochondria of a living cell. Two-photon images of mitochondria were obtained by staining living HEK293 cells with these dyes. When 4-[4-[4-(dimethylamino)phenyl]-1,3-butadienyl]-1-ethyl-pyridinium perchlorate was employed, a two-photon-induced fluorescence image could be obtained even when a 3 mW fiber laser beam was used as the excitation source.


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Address all correspondence to J. Kawamata at


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MRS Communications
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  • EISSN: 2159-6867
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