Fluorescent research of antibiotic phototransformation in aqueous solution

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We presented a spectral-luminescent study of the sulfaguanidine phototransformation in aqueous solution under the action of ultraviolet lamp OUVb-04 (180—275 nm), KrCl (222 nm), XeBr (282 nm) and XeCl (308 nm) excilamps. An analysis of the conversion of sulfaguanidine in water shows that, under the action of XeBr excilamp radiation, the efficiency of sulfaguanidine phototransformation in water is comparable to the decrease upon excitation of OUVb-04, but higher than upon irradiation with KrCl or XeCl excilamps. The maximum loss for sulfaguanidine is 99 % without the introduction of additional oxidizing agents. After irradiation, several photoproducts of various nature were recorded.

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Sobre autores

N. Bezlepkina

National Research Tomsk State University

Autor responsável pela correspondência
Email: nadezhda.bezlepkina174833@mail.ru
Rússia, Tomsk

O. Tchaikovskaya

National Research Tomsk State University; Institute of Electrophysics of the Ural Branch of the Russian Academy of Sciences

Email: nadezhda.bezlepkina174833@mail.ru
Rússia, Tomsk; Yekaterinburg

E. Bocharnikova

National Research Tomsk State University

Email: nadezhda.bezlepkina174833@mail.ru
Rússia, Tomsk

Bibliografia

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2. Fig. 1. Structural formulae of sulfaguanidine (a) and its putative transformation products: (b) sulfanilamide, (c) sulfanilic acid, (d) sulfacetamide, (e) phthalic acid, (f) phthalyl sulfacetamide (thalamide), (g) sulfasuccidine, (h) photoproduct P1, (i) photoproduct P2

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3. Fig. 2. Absorption (a, b) and fluorescence (c-e) spectra of sulfaguanidine in water under the action of OUVb-04 (a, c, d, e, f) and XeBr excilamp radiation (b, d). Fluorescence excitation wavelength λ = 260 nm (c, d), 300 nm (e) and 350 nm (f). Irradiation time: 1 - 0 min, 2 - 1 min, 3 - 2 min, 4 - 4 min, 5 - 8 min, 6 - 16 min, 7 - 32 min, 8 - 64 min

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4. Fig. 3. Sulfaguanidine loss (a) and photoproduct formation (b) depending on the irradiation source (1 - KrCl, 2 - XeBr, 3 - XeCl, 4 - OUVb-04). According to the data from the fluorescence (a) spectra at 344 nm and absorption (b) spectra at 560 nm

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5. Fig. 4. Fluorescence excitation spectra of sulfaguanidine in water after irradiation with OUVb-04 lamp. Irradiation time: 1 - 0 min, 2 - 1 min, 3 - 2 min, 4 - 4 min, 5 - 8 min, 6 - 16 min, 7 - 32 min, 8 - 64 min. Emission wavelength 350 nm (a) and 430 nm (b)

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