A novel PGA/TiO2 nanocomposite prepared with poly(γ-glutamic acid) from the newly isolated Bacillus subtilis 17B strain

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Published: Oct 25, 2023
Updated: 25.10.2023
DOI: https://doi.org/10.2298/JSC‌221116011S
Keywords:
PGA production wild-type Bacillus strain PGA characterization cytotoxicity

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Marinela Šokarda Slavić
University of Belgrade – Institute of Chemistry, Technology and Metallurgy – National Institute of the Republic of Serbia, Department of Chemistry, Njegoševa 12, Belgrade, Republic of Serbia
https://orcid.org/0000-0002-9041-552X
Vanja Ralić
Center for light-based research and technologies, COHERENCE, Department of Atomic Physics, VINČA Institute of Nuclear Sciences, National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Republic of Serbia
https://orcid.org/0000-0002-3206-1831
Branislav Nastasijević
VINČA Institute of Nuclear Sciences, National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Republic of Serbia
https://orcid.org/0000-0002-4529-1599
Milica Matijević
Center for light-based research and technologies, COHERENCE, Department of Atomic Physics, VINČA Institute of Nuclear Sciences, National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Republic of Serbia
https://orcid.org/0000-0002-9846-6671
Zoran Vujčić
University of Belgrade – Faculty of Chemistry, Department of Biochemistry, Belgrade, Republic of Serbia
https://orcid.org/0000-0002-8963-2439
Aleksandra Margetić
University of Belgrade – Institute of Chemistry, Technology and Metallurgy – National Institute of the Republic of Serbia, Department of Chemistry, Belgrade, Republic of Serbia
https://orcid.org/0000-0003-2445-0375

Abstract

Poly(γ-glutamic acid) (PGA), naturally produced by Bacillus species, is a biodegradable, non-toxic, biocompatible and non-immunogenic negatively charged polymer. Due to its properties, it has found various applications in the food, cosmetic and pharmaceutical industries. In this work, Bacillus subtilis 17B was selected as the best PGA producer among fifty wild-types Bacillus strains tested and characterized as a glutamate-independent producer. The pro­duction of PGA by the newly identified strain was optimized and increased tenfold using the Box–Behnken experimental design. The purity of PGA after recovery and purification from the fermentation broth was confirmed by SDS-PAGE followed by methylene blue staining. PGA was characterized by ESI MS and used for the preparation of a new nanocomposite with TiO2. The syn­thesis of PGA/TiO2 nanocomposite, its structural analysis, and cytotoxic effect on the cervical cancer cell line (HeLa cell) was investigated to determine the potential anti-cancer usage of this newly prepared material. It is encouraging that PGA/TiO2 nanocomposite showed an increased cytotoxic effect compared to TiO2 alone.

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[1]
M. Šokarda Slavić, V. . Ralić, B. Nastasijević, M. Matijević, Z. Vujčić, and A. Margetić, “A novel PGA/TiO2 nanocomposite prepared with poly(γ-glutamic acid) from the newly isolated Bacillus subtilis 17B strain”, J. Serb. Chem. Soc., vol. 88, no. 10, pp. 985–997, Oct. 2023.
Issue
Vol. 88 No. 10 (2023)
Section
Biochemistry & Biotechnology
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