On the use of the spectral luminescent method for studying acid-base equilibria of uracil derivatives in aqueous solutions

Ivanov Sergey P.; Ostakhov Sergei S.; Abdrakhimova Gulnaz S.; Akhiyarov Aidar A.; Khursan Sergey L.

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On the use of the spectral luminescent method for studying acid-base equilibria of uracil derivatives in aqueous solutions

机译：关于水溶液中尿嘧啶衍生物研究酸碱平衡的光谱发光法

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摘要

The effect of pH on fluorescence parameters (spectral composition, intensity I-fl , and quantum yield (phi) of thymine (T), 5-fluorouracil (FU) and 6-aminouracil (AU) have been investigated in aqueous solutions. As found, there is the regularity of the changes in the spectral composition, intensity, and quantum yields of uracil fluorescence depending on pH. The constants of the acid-base equilibria of uracils (pK(a)) determined by the fluorescence titration method are: 9.9 (T), 8.0 (FU), and 9.1 (AU) at 298 K. These pK(a1) values satisfactorily agree with the previous estimates obtained by independent experimental or quantum chemical methods. The possibilities of the spectral fluorescence method for the quantitative description of the acid-base equilibria of uracils depending on the fluorescent features of the pyrimidinedione and its conjugate base are discussed.

机译：在水溶液中研究了pH对荧光参数（光谱组成，强度I-F1和量子产率（PHI）的荧光参数（光谱成分，强度I-FL和量子产率（PHI）。，根据pH值，尿嘧啶荧光荧光荧光的荧光荧光的变化的规律性。由荧光滴定法测定的尿嘧啶的酸碱平衡的常数是：9.9 （T），8.0（FU）和9.1（AU），298 K.这些PK（A1）值令人满意地同意通过独立实验或量子化学方法获得的先前估计。光谱荧光方法的定量描述的可能性讨论了尿嘧啶的酸碱平衡，这取决于嘧啶二氧化酰胺的荧光特征及其缀合物碱。

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来源
《Biophysical Chemistry: An International Journal Devoted to the Physical Chemistry of Biological Phenomena》 |2020年第1期|共6页
作者
Ivanov Sergey P.; Ostakhov Sergei S.; Abdrakhimova Gulnaz S.; Akhiyarov Aidar A.; Khursan Sergey L.;
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Russian Acad Sci Ufa Inst Chem Ufa Fed Res Ctr 71 Prospekt Oktyabrya Ufa 450054 Russia;

Russian Acad Sci Ufa Inst Chem Ufa Fed Res Ctr 71 Prospekt Oktyabrya Ufa 450054 Russia;

Russian Acad Sci Ufa Inst Chem Ufa Fed Res Ctr 71 Prospekt Oktyabrya Ufa 450054 Russia;

Russian Acad Sci Ufa Inst Chem Ufa Fed Res Ctr 71 Prospekt Oktyabrya Ufa 450054 Russia;

Russian Acad Sci Ufa Inst Chem Ufa Fed Res Ctr 71 Prospekt Oktyabrya Ufa 450054 Russia;

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正文语种 eng
中图分类生物化学;
关键词
Thymine; 5-fluorouracil; 6-aminouracil; Fluorescence; Acid-base equilibrium; pK(a);

机译：胸腺嘧啶;5-氟尿嘧啶;6- aminouracil;荧光;酸基平衡;PK（A）;

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On the use of the spectral luminescent method for studying acid-base equilibria of uracil derivatives in aqueous solutions

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