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• W2093598081 abstract "The chromophore loss in a series of 17 uracil derivatives, e.g. polyuridylic acid (poly(U)), nucleotides, nucleosides and methylated uracus (0.3 mM or less), was studied in aqueous solution at room temperature using low and high intensity irradiation methods. The quantum yields of chromophore loss from continuous 254 nm irradiation (Φ0cl) and from 248 nm laser pulses (20 ns) at a typical intensity of 8 × 1O6 W cm−2 (ΦLcl) are compared. Φ0cl values cover the range from 0.0002 for 1,3-dimethylthymine to 0.027 for poly(U) at neutral pH; the corresponding ΦLcl values are 0.002 and 0.05. Results from high performance liquid chromatography (HPLC) suggest the formation of photohydrates as a major process, e.g. for uridine-5′-monophosphate, uridine and several substituted uracils using continuous irradiation. This is supported by the observation that saturation with different gases (argon, oxygen, N2O) has virtually no effect on the quantum yields and that the values show a decreasing trend with increasing pH. Apart from a few compounds, e.g. uracil, where the effect of pH is markedly larger on Φ0cl than on ΦLcl, the trend in the quantum yields with the variation in substituents is similar under both types of irradiation conditions. However, laser-induced processes also contribute to chromophore loss, since the amount of side products (which do not reform the original substrate after heating) is substantial. In addition, uracil is released on laser pulse photolysis of poly(U) (Φ = 0.003). The mechanism of photohydrate formation of pyrimidines and the influence of substitution by methyl groups in uracil on hydrate formation are discussed." @default.
• W2093598081 created "2016-06-24" @default.
• W2093598081 creator A5036773492 @default.
• W2093598081 date "1991-07-01" @default.
• W2093598081 modified "2023-09-23" @default.
• W2093598081 title "Chromophore loss of uracil derivatives and polyuridylic acid in aqueous solution caused by 248 nm laser pulses and continuous UV irradiation: Mechanism of the photohydration of pyrimidines" @default.
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• W2093598081 doi "https://doi.org/10.1016/1011-1344(91)80215-4" @default.
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