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- W2067347926 abstract "The keto and enol tautomers of doxycycline were separated by liquid chromatography on poly(styrene-divinylbenzene). The keto-enol tautomerism occurred between C-11a and C-12. The chemical structure of the tautomers was elucidated by on-line and off-line UV spectrophotometry and by 13C-NMR spectrometry. The kinetics of the equilibrium were investigated in the pH range 1–12. The equilibrium was subject to base catalysis. The tautomerism was enhanced by protonation of doxycycline. The assignment of the groups responsible for the micro-ionization of doxycycline was discussed. Activation parameters were determined at pH 4.0." @default.
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- W2067347926 date "1993-07-01" @default.
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- W2067347926 title "Investigation of keto-enol tautomerism and ionization of doxycycline in aqueous solutions" @default.
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- W2067347926 doi "https://doi.org/10.1016/0378-5173(93)90207-v" @default.
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