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	Application of Raman spectroscopy to study the inactivation process of bacterial microorganisms</div>

Matveeva Karina I. , Anna A. Kundalevich, Kapitunova Anastasia I., Zozulya Aleksandr S., Sukhikh Stanislav A. , Tsibulnikova Anna V., Zyubin Andrey Yu. , Samusev Ilia G.

2023 , VOLUME 23, NUMBER 4 ( july-august )

ISSN 2226-1494 (print), ISSN 2500-0373 (online)

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Nikiforov
Vladimir O.
D.Sc., Prof.

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doi: 10.17586/2226-1494-2023-23-4-676-684

Application of Raman spectroscopy to study the inactivation process of bacterial microorganisms

K. I. Matveeva, A. A. Kundalevich, A. I. Kapitunova, A. S. Zozulya, S. A. Sukhikh, A. V. Tsibulnikova, A. Y. Zyubin, I. G. Samusev

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Matveeva K.I., Kundalevich A.A., Kapitunova A.I., Zozulya A.S., Sukhikh S.A., Tsibulnikova A.V., Zyubin A.Yu., Samusev I.G. Application of Raman spectroscopy to study the inactivation process of bacterial microorganisms. Scientific and Technical Journal of Information Technologies, Mechanics and Optics, 2023, vol. 23, no. 4, pp. 676–684 (in Russian). doi: 10.17586/2226-1494-2023-23-4-676-684

Abstract

Raman spectroscopy (RS) is one of the promising approaches for structural and functional studies of various biological objects, including bacterial microorganisms. Both traditional biochemical tests and genetic methods which require expensive reagents, consumables and are time-consuming are used for bacterial analysis. Spectroscopic methods are positioned as noninvasive, highly sensitive, and requiring minimal sample preparation. In this work we investigated the possibility of using the RS method using optical sensors based on gold anisotropic nanoparticles. The applicability of the method was demonstrated by studying the effect of a broad-spectrum cephalosporin antibiotic and an extract of Viburnum opulus L (VO) on Escherichia coli (E. Coli) colonies. The studies were performed by Raman spectroscopy using a Virsa spectrometer (Renishaw). Raman signal amplification was carried out using two original optical sensors proposed by the authors. To create sensors, we used a chemical method of depositing gold nanostars on APTES-modified quartz glasses and a physical method for creating sensors based on anodizing titanium surfaces. The results of the study showed the high sensitivity and information content of the proposed method. The possibility of using the RS method for studying the inactivation of bacterial microorganisms is shown. Spectral Raman bands of E. Coli were determined and identified before and after exposure to VO extract and antibiotic as a control. A decrease in the intensity of spectral modes corresponding to amino acids and purine metabolites was found in the average Raman spectrum of E. Coli after exposure to VO extract. For the first time, a study of the antimicrobial effect of an aqueous extract of VO fruits was carried out by the method of Raman scattering. It has been shown that the use of plant extracts, including VO fruit extracts, to inactivate the vital activity of bacterial colonies is a promising approach to the search for new alternative antibacterial agents. The results obtained are in good agreement with the already known scientific studies and confirm the effectiveness of the proposed method.

Keywords: plasmon resonance, nanostars, SERS, Viburnum opulus L, Escherichia coli, antibiotics

Acknowledgements. The work was supported by the Ministry of Education and Science of the Russian Federation State Assignment no. FZWM-2020-0003 “Research of new materials and methods of plasma and phototherapy of cancer, dermatitis, and septic complications” 2020-2023.

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