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자료유형
학술저널
저자정보
Hirakawa, Kazutaka (Department of Applied Chemistry and Biochemical Engineering, Graduate School of Engineering, Shizuoka University) Ito, Yusuke (Department of Applied Chemistry and Biochemical Engineering, Graduate School of Engineering, Shizuoka University) Yamada, Takashi (Department of Applied Chemistry and Biochemical Engineering, Graduate School of Engineering, Shizuoka University) Okazaki, Shigetoshi (Medical Photonics Research Center, Hamamatsu University School of Medicine)
저널정보
한국광과학회 Rapid communication in photoscience : RCP Rapid communication in photoscience : RCP 제3권 제4호
발행연도
2014.1
수록면
81 - 84 (4page)

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초록· 키워드

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To examine the microenvironmental effect of DNA on the photosensitized reaction, the electron-donor-connecting porphyrin, meso-(9-phenanthryl)-tris(N-methyl-p-pyridinio) porphyrin (Phen-TMPyP), was synthesized. Phen-TMPyP can bind to oligonucleotides with two binding modes, depending on the DNA concentration. The fluorescence lifetime measurement of Phen-TMPyP shows a shorter component than that of the reference porphyrin without the phenanthryl moiety. However, the observed value is much longer than those of previously reported similar types of electron-donor-connecting porphyrins, suggesting that electron-transfer quenching by the phenanthryl moiety is not sufficient. The fluorescence quantum yield of Phen-TMPyP ($5{\mu}M$) decreased with an increase in DNA concentration of up to $5{\mu}M$ base pair (bp), possibly due to self-quenching through an aggregation along the DNA strand, increased with an increase in DNA concentration of more than $5{\mu}M$ bp and reached a plateau. The fluorescence quantum yield of Phen-TMPyP with a sufficient concentration of DNA was larger than that of the reference porphyrin. The singlet oxygen ($^1O_2$) generating activity of Phen-TMPyP was confirmed by the near-infrared emission spectrum measurement. The quantum yield of $^1O_2$ generation was decreased by a relatively small concentration of DNA, possibly due to the aggregation of Phen-TMPyP, and recovered with a sufficient concentration of DNA. The recovered quantum yield was rather smaller than that without DNA, indicating the quenching of $^1O_2$ by DNA. These results show that a DNA strand can stabilize the photoexcited state of a photosensitizer and, in a certain case, suppresses the $^1O_2$ generation.

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