Photochemical quenching of Tagetes patula chromophore fluorescence in the presence of ytterbium ions upon oxygen saturation

Artamonov D.A., Tsybulnikova, A.V., Zemlyakova E.S., Slezhkin, V.A., Kostrina A.A., Samusev, I.G., Bryukhanov, V.V.

For Russian citation (Opticheskii Zhurnal):

Артамонов Д.А., Цибульникова А.В., Землякова Е.С., Слежкин В.А., Кострина А.А., Самусев И.Г., Брюханов В.В. Фотохимическое тушение флуоресценции хромофоров Tagetes patula в присутствии ионов иттербия при насыщении кислородом // Оптический журнал. 2026. Т. 93. № 12. С. 104–115. http://doi.org/10.17586/1023-5086-2026-93-12-104-115

Artamonov D.A., Tsibulnikova A.V., Zemlyakova E.S., Slezhkin V.A., Kostrina A.A., Samusev I.G., Bryukhanov V.V. Photochemical quenching of Tagetes patula chromophore fluorescence in the presence of ytterbium ions upon oxygen saturation [in Russian] // Opticheskii Zhurnal. 2026. V. 93. № 12. P. 104–115. http://doi.org/10.17586/1023-5086-2026-93-12-104-115

For citation (Journal of Optical Technology):

Abstract:

Subject of research. Photophysical and photochemical processes in ethanol extracts of Tagetes patula containing lutein under molecular oxygen saturation and in the presence of ytterbium ions. Aim of the work. To establish the influence of molecular oxygen and ytterbium ions on lutein photostability and degradation and determine the mechanism of fluorescence quenching. Method. Extract optical properties were studied by absorption spectroscopy, steady-state fluorescence, and luminescence lifetime measurements. A sphere-of-action model was used for quantitative interpretation. Main results. Oxygen saturation decreases optical density in the visible range, indicating photochemical destruction of the conjugated lutein system. Ytterbium ions enhance static quenching: the calculated constant increases almost eightfold and the effective interaction radius approximately doubles. The ytterbium-containing complex also retains a longer luminescence lifetime after oxygen saturation than the initial extract. Scientific novelty. The work quantitatively describes the combined influence of oxygen and ytterbium ions on a natural multicomponent chromophore. Practical significance. The results can support the development of optical oxygen sensors and photostable materials based on biocompatible plant compounds.

Keywords:

Tagetes patula, lutein, photochemical quenching, ytterbium ions, oxygen saturation, heavy atom effect, sphere-of-action model, static quenching, absorption spectra, luminescence

Acknowledgements:

this work was supported by the Ministry of Science and Higher Education of the Russian Federation under Project № FZWM-2020-0003 and by the Priority 2030 program.

OCIS codes: 300.0300, 260.2160

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