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Antimicrobial, Antioxidant, Cytotoxic Activities and Phytochemical Analysis of Fungal Endophytes Isolated from Ocimum Basilicum

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Abstract

Fungal endophytes are living inside plants without any harmful effects; the prospecting about them is increased day by day because they can produce bioactive compounds which can be used in different applications. Herein, the current study was aimed to isolate the endophytic fungi from the Ocimum basilicum plant as safe microorganisms and evaluate their biological activities. The results illustrated that three endophytic fungal strains were isolated and identified morphologically and genetically as Aspergillus nidulans, Aspergillus fumigatus, and Aspergillus flavus and deposited in gene bank under accession numbers MZ045561, MZ045562, and MZ045563 respectively. Moreover, cell-free filtrates of endophytic fungal strains were extracted using ethyl acetate, where these crude extracts exhibited promising antimicrobial activity against Staphylococcus aureus, Bacillus cereus, Bacillus subtilis, Escherichia coli, Salmonella typhimurium, Pseudomonas aeruginosa, Klebsiella pneumonia, and Candida albicans at a concentration of 1000 µg/mL. Furthermore, these endophytic strains exhibited a potential antioxidant activity where IC50 of the crude extract of A. nidulans, A. fumigatus, and A. flavus were (166.3, 68.4, and 347.1 µg/mL) and (151.2, 77.9, and 246.3 µg/mL) using DPPH and ABTS methods, respectively. Furthermore, the ethyl acetate crude extracts of these endophytic fungi did not exhibit any cytotoxic effect against Vero and Wi 38 normal cells. GC–MS analysis of the crude extract of A. nidulans, A. fumigatus, and A. flavus indicated the presence of 22, 22, and 20 active compounds, respectively. The major compounds in the fungal extracts are belonging to fatty acids, fatty acid esters, tetrahydrofurans, and sterols. In conclusion, the isolated endophytic A. nidulans, A. fumigatus, and A. flavus from Ocimum basilicum are promising sources for bioactive compounds.

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Data Availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

Code Availability

Not applicable.

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Acknowledgements

The authors express their sincere thanks to the Faculty of Science, Al-Azhar University, Egypt, for support of this research work.

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  1. Botany and Microbiology Department, Faculty of Science, Al-Azhar University, Cairo, 11884, Egypt

    Mohamed H. Sharaf, Amer M. Abdelaziz, Mohamed H. Kalaba, Ahmed A. Radwan & Amr H. Hashem

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Mohamed H. Sharaf: conceptualization, methodology, formal analysis and investigation, writing – original draft preparation, writing – review and editing, resources, software; Amer M. Abdelaziz: conceptualization, methodology, formal analysis and investigation, writing – original draft preparation, writing – review and editing, resources, software; Mohamed H. Kalaba: conceptualization, methodology, formal analysis and investigation, writing – original draft preparation, writing – review and editing, resources, software; Ahmed A. Radwan: methodology, formal analysis and investigation, writing – original draft preparation, writing – review and editing, resources, software; Amr H. Hashem: conceptualization, methodology, formal analysis and investigation, writing – original draft preparation, writing – review and editing, resources, software.

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Sharaf, M.H., Abdelaziz, A.M., Kalaba, M.H. et al. Antimicrobial, Antioxidant, Cytotoxic Activities and Phytochemical Analysis of Fungal Endophytes Isolated from Ocimum Basilicum. Appl Biochem Biotechnol 194, 1271–1289 (2022). https://doi.org/10.1007/s12010-021-03702-w

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  • DOI: https://doi.org/10.1007/s12010-021-03702-w

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