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Abdel-Moneim AME, El-Saadony MT, Shehata AM, Saad AM, Aldhumri SA, Ouda SM, Mesalam NM. Antioxidant and antimicrobial activities of Spirulina platensis extracts and biogenic selenium nanoparticles against selected pathogenic bacteria and fungi. Saudi J Biol Sci 2022; 29:1197-1209. [PMID: 35197787 PMCID: PMC8848030 DOI: 10.1016/j.sjbs.2021.09.046] [Citation(s) in RCA: 75] [Impact Index Per Article: 37.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Revised: 08/13/2021] [Accepted: 09/13/2021] [Indexed: 12/14/2022] Open
Abstract
This study investigated the antimicrobial and antioxidant activity of three Spirulina extracts (methanol, acetone, and hexane) and the biological selenium nanoparticles (SeNPs) fabricated by Bacillus subtilis AL43. The results showed that Spirulina extracts exhibited antimicrobial activity against tested pathogens. Besides, Spirulina extracts significantly scavenged ABTS and DPPH radicals in a dose-dependent manner. The methanolic extract had higher total phenolic content, antimicrobial activity, and antioxidant activity than other extracts. The selenium nanoparticles were synthesized by Bacillus subtilis AL43 under aerobic conditions and were characterized as spherical, crystalline with a size of 65.23 nm and a net negative charge of −22.7. We evidenced that SeNPs possess considerable antimicrobial activity against three gram-positive, three gram-negative bacteria, and three strains from both Candida sp. and Aspergillus sp. Moreover, SeNPs were able to scavenge ABTS and DPPH radicals in a dose-dependent manner. An association was found between the total phenolic content of Spirulina and SeNPs and their biological activities. Our results indicate that Spirulina and SeNPs with significant antimicrobial and antioxidant activities seem to be successful candidates for safe and reliable medical applications.
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Affiliation(s)
- Abdel-Moneim Eid Abdel-Moneim
- Biological Applications Department, Nuclear Research Center, Egyptian Atomic Energy Authority, 13759, Egypt
- Corresponding author.
| | - Mohamed T. El-Saadony
- Department of Agricultural Microbiology, Faculty of Agriculture, Zagazig University, Zagazig 44511, Egypt
| | - Abdelrazeq M. Shehata
- Department of Animal Production, Faculty of Agriculture, Al-Azhar University, Cairo 11651, Egypt
| | - Ahmed M. Saad
- Biochemistry Department, Faculty of Agriculture, Zagazig University, Zagazig 44511, Egypt
| | - Sami Ali Aldhumri
- Department of Biology, Khurmah University College, Taif University, 11099, Taif 21944, Saudi Arabia
| | - Sahar M Ouda
- Department of Biology, Khurmah University College, Taif University, 11099, Taif 21944, Saudi Arabia
- Plant Research Department, Nuclear Research Center, Egyptian Atomic Energy Authority, 13759, Egypt
| | - Noura M. Mesalam
- Biological Applications Department, Nuclear Research Center, Egyptian Atomic Energy Authority, 13759, Egypt
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