| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Correlation of Photosensitization and Binding Mode of Methylene Blue and DNA |
| LIU Tao, ZHANG Feng, CHEN Ping, TANG Guo-Qing, LIN Lie**
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Key Laboratory of Optoelectronic Information Science and Technology (Ministry of Education), Institute of Modern Optics, Nankai University, Tianjin 300071
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LIU Tao, ZHANG Feng, CHEN Ping et al 2011 Chin. Phys. Lett. 28 014208 |
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Abstract Binding of methylene blue (MB) and DNA, photosensitization of MB in DNA, and correlation of photosensitization and binding mode are studied at different concentration ratios of DNA and MB. The absorption spectra indicate that the electrostatic binding is the main mode at low γ ratios (γ≤2), while at high γ ratios (γ>2) the intercalative binding is dominated. Studies on dynamics of photosensitization formation of singlet oxygen (1O2) for MB in DNA are carried out by using time−resolved technology. There are no obvious changes of the singlet oxygen lifetime and the triplet state MB molecule (MB3+∗) lifetime at low ratios, they are about 4 μs and 1 µs, respectively. However, we could not obtain the 1O2 lifetime and MB3+∗ lifetime due to the great decrease of 1O2 phosphorescence signals at high ratios. These results show that the photosensitization and binding mode of MB in DNA possess high correlation. When MB binds with DNA by electrostatic interaction, type−II photosensitization of MB plays a major role in photodynamic effect, the damage of DNA probably could be ascribed to 1O2. However, at high ratios, binding mode between MB and DNA turns to intercalative binding, which greatly weakens the type−II photosensitization process. Charge transfer between MB and DNA possibly becomes the main damage mechanism.
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| Keywords:
42.62.Be
87.80.Dj
87.64.km
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Received: 01 November 2010
Published: 23 December 2010
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