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This is consistent with results reported previously (see ref. [21]).
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It is interesting that 8-hydroxy-derivatives of dGuo were also not formed on photochemical production (by sensitization by riboflavin) of the radical cation of dGuo in dilute aqueous solution of dGuo, in contrast to when the dGuo radical cation was generated in ds DNA, in which 8-HOdGuo was produced in high yield (see H. Kasai, Z. Yamaizumi, M. Berger, J. Cadet, J. Am. Chem. Soc. 1992, 114, 9692). This can be explained by assuming a much longer lifetime of the radical cation in DNA ( K. Hildenbrand, D. Schulte-Frohlinde, Free Radical Res. Commun. 1990, 11, 195, have measured the lifetime of the deprotonated dGuo radical cation in ds DNA in aqueous solution to be 5 s, while in ss DNA its lifetime was too short to be measured) compared with the monomeric dGuo, such that only in ds DNA the very slow hydration reaction has a chance to proceed (an alternative is that the hydration reaction is much faster in ds DNA than in the case of the "monomeric" radical cation). For further discussion, see A. Spassky, D. Angelov, Biochemistry 1997, 36, 6571 and D. Angelov, A. Spassky, M. Berger, J. Cadet, J. Am. Chem. Soc. 1997, 119, 11373.
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It is interesting that 8-hydroxy-derivatives of dGuo were also not formed on photochemical production (by sensitization by riboflavin) of the radical cation of dGuo in dilute aqueous solution of dGuo, in contrast to when the dGuo radical cation was generated in ds DNA, in which 8-HOdGuo was produced in high yield (see H. Kasai, Z. Yamaizumi, M. Berger, J. Cadet, J. Am. Chem. Soc. 1992, 114, 9692). This can be explained by assuming a much longer lifetime of the radical cation in DNA ( K. Hildenbrand, D. Schulte-Frohlinde, Free Radical Res. Commun. 1990, 11, 195, have measured the lifetime of the deprotonated dGuo radical cation in ds DNA in aqueous solution to be 5 s, while in ss DNA its lifetime was too short to be measured) compared with the monomeric dGuo, such that only in ds DNA the very slow hydration reaction has a chance to proceed (an alternative is that the hydration reaction is much faster in ds DNA than in the case of the "monomeric" radical cation). For further discussion, see A. Spassky, D. Angelov, Biochemistry 1997, 36, 6571 and D. Angelov, A. Spassky, M. Berger, J. Cadet, J. Am. Chem. Soc. 1997, 119, 11373.
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It is interesting that 8-hydroxy-derivatives of dGuo were also not formed on photochemical production (by sensitization by riboflavin) of the radical cation of dGuo in dilute aqueous solution of dGuo, in contrast to when the dGuo radical cation was generated in ds DNA, in which 8-HOdGuo was produced in high yield (see H. Kasai, Z. Yamaizumi, M. Berger, J. Cadet, J. Am. Chem. Soc. 1992, 114, 9692). This can be explained by assuming a much longer lifetime of the radical cation in DNA ( K. Hildenbrand, D. Schulte-Frohlinde, Free Radical Res. Commun. 1990, 11, 195, have measured the lifetime of the deprotonated dGuo radical cation in ds DNA in aqueous solution to be 5 s, while in ss DNA its lifetime was too short to be measured) compared with the monomeric dGuo, such that only in ds DNA the very slow hydration reaction has a chance to proceed (an alternative is that the hydration reaction is much faster in ds DNA than in the case of the "monomeric" radical cation). For further discussion, see A. Spassky, D. Angelov, Biochemistry 1997, 36, 6571 and D. Angelov, A. Spassky, M. Berger, J. Cadet, J. Am. Chem. Soc. 1997, 119, 11373.
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6744236921
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The remaining 13-18% are due to radicals formed by H-abstraction from the deoxyribose moiety.
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