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• W4386009529 abstract "Epigenetic modifications are closely related to certain disorders of the organism, including the development of tumors. One of the main epigenetic modifications is the methylation of DNA cytosines, 5-methyl-2'-deoxycycytidine. Furthermore, 5-mdC can be oxidized to form three new modifications, 5-(hydroxymethyl)-2'-deoxycytidine, 5-formyl-2'-deoxycytidine, and 5-carboxy-2'-deoxycytidine. The coupling of liquid chromatography with tandem mass spectrometry has been widely used for the total determination of methylated DNA cytosines in samples of biological and clinical interest. These methods are based on the measurement of the free compounds (e.g., urine) or after complete hydrolysis of the DNA (e.g., tissues) followed by a preconcentration, derivatization, and/or clean-up step. This review highlights the main advances in the quantification of modified nucleotides and nucleosides by isotope dilution using isotopically labeled analogs combined with liquid or gas chromatography coupled to mass spectrometry reported in the last 20 years. The different possible sources of labeled compounds are indicated. Special emphasis has been placed on the different types of chromatography commonly used (reverse phase and hydrophilic interaction liquid chromatography) and the derivatization methods developed to enhance chromatographic resolution and ionization efficiency. We have also revised the application of bidimensional chromatography and indicated significant biological and clinical applications of these determinations." @default.
• W4386009529 created "2023-08-21" @default.
• W4386009529 creator A5006921569 @default.
• W4386009529 creator A5009663436 @default.
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• W4386009529 creator A5018408624 @default.
• W4386009529 creator A5048345933 @default.
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• W4386009529 creator A5063352882 @default.
• W4386009529 creator A5081799844 @default.
• W4386009529 date "2023-08-19" @default.
• W4386009529 modified "2023-09-25" @default.
• W4386009529 title "Quantification of modified nucleotides and nucleosides by isotope dilution mass spectrometry" @default.
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