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Osorio-Olivares ME, Vásquez-Martínez Y, Díaz K, Canelo J, Taborga L, Espinoza-Catalán L. Antibacterial and Antioxidant Activity of Synthetic Polyoxygenated Flavonoids. Int J Mol Sci 2024; 25:5999. [PMID: 38892186 PMCID: PMC11172986 DOI: 10.3390/ijms25115999] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2024] [Revised: 05/19/2024] [Accepted: 05/22/2024] [Indexed: 06/21/2024] Open
Abstract
Flavonoids are an abundant class of naturally occurring compounds with broad biological activities, but their limited abundance in nature restricts their use in medicines and food additives. Here we present the synthesis and determination of the antibacterial and antioxidant activities of twenty-two structurally related flavonoids (five of which are new) by scientifically validated methods. Flavanones (FV1-FV11) had low inhibitory activity against the bacterial growth of MRSA 97-7. However, FV2 (C5,7,3',4' = OH) and FV6 (C5,7 = OH; C4' = SCH3) had excellent bacterial growth inhibitory activity against Gram-negative E. coli (MIC = 25 µg/mL for both), while Chloramphenicol (MIC = 25 µg/mL) and FV1 (C5,7,3' = OCH3; 4' = OH) showed inhibitory activity against Gram-positive L. monocytogenes (MIC = 25 µg/mL). From the flavone series (FO1-FO11), FO2 (C5,7,3',4' = OH), FO3 (C5,7,4' = OH; 3' = OCH3), and FO5 (C5,7,4' = OH) showed good inhibitory activity against Gram-positive MRSA 97-7 (MIC = 50, 12, and 50 µg/mL, respectively), with FO3 being more active than the positive control Vancomycin (MIC = 25 µg/mL). FO10 (C5,7= OH; 4' = OCH3) showed high inhibitory activity against E. coli and L. monocytogenes (MIC = 25 and 15 µg/mL, respectively). These data add significantly to our knowledge of the structural requirements to combat these human pathogens. The positions and number of hydroxyl groups were key to the antibacterial and antioxidant activities.
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Affiliation(s)
| | - Yesseny Vásquez-Martínez
- Escuela de Medicina, Facultad de Ciencias Médicas, Laboratorio de Virología Molecular y Control de Patógenos, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago 9170022, Chile; (Y.V.-M.); (J.C.)
| | - Katy Díaz
- Laboratorio de Pruebas Biológicas, Departamento de Química, Universidad Técnica Federico Santa María, Valparaíso 2390123, Chile;
| | - Javiera Canelo
- Escuela de Medicina, Facultad de Ciencias Médicas, Laboratorio de Virología Molecular y Control de Patógenos, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago 9170022, Chile; (Y.V.-M.); (J.C.)
| | - Lautaro Taborga
- Laboratorio de Productos Naturales, Departamento de Química, Universidad Técnica Federico Santa María, Valparaíso 2390123, Chile;
| | - Luis Espinoza-Catalán
- Laboratorio de Síntesis Orgánica, Departamento de Química, Universidad Técnica Federico Santa María, Valparaíso 2390123, Chile;
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Ramundo A, Hurtová M, Božek I, Osifová Z, Russo M, Ngoy BP, Křen V, Klán P. Multimodal Carbon Monoxide Photorelease from Flavonoids. Org Lett 2024; 26:708-712. [PMID: 38227978 PMCID: PMC10825817 DOI: 10.1021/acs.orglett.3c04141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2023] [Revised: 01/05/2024] [Accepted: 01/11/2024] [Indexed: 01/18/2024]
Abstract
Photooxygenation of flavonoids leads to the release of carbon monoxide (CO). Our structure-photoreactivity study, employing several structurally different flavonoids, including their 13C-labeled analogs, revealed that CO can be produced via two completely orthogonal pathways, depending on their hydroxy group substitution pattern and the reaction conditions. While photooxygenation of the enol 3-OH group has previously been established as the CO liberation channel, we show that the catechol-type hydroxy groups of ring B can predominantly participate in photodecarbonylation.
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Affiliation(s)
- Andrea Ramundo
- Department
of Chemistry, Faculty of Science, Masaryk
University, Kamenice 5, 625 00 Brno, Czech Republic
- RECETOX,
Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech
Republic
| | - Martina Hurtová
- Laboratory
of Biotransformation, Institute of Microbiology
of the Czech Academy of Sciences, Vídeňská 1083, 142 00 Prague, Czech Republic
| | - Igor Božek
- Department
of Chemistry, Faculty of Science, Masaryk
University, Kamenice 5, 625 00 Brno, Czech Republic
- RECETOX,
Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech
Republic
| | - Zuzana Osifová
- Institute
of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nám. 542, 166 00 Prague, Czech Republic
| | - Marina Russo
- Department
of Chemistry, Faculty of Science, Masaryk
University, Kamenice 5, 625 00 Brno, Czech Republic
- RECETOX,
Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech
Republic
| | - Bokolombe Pitchou Ngoy
- Department
of Chemistry, Faculty of Science, Masaryk
University, Kamenice 5, 625 00 Brno, Czech Republic
- RECETOX,
Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech
Republic
| | - Vladimír Křen
- Laboratory
of Biotransformation, Institute of Microbiology
of the Czech Academy of Sciences, Vídeňská 1083, 142 00 Prague, Czech Republic
| | - Petr Klán
- Department
of Chemistry, Faculty of Science, Masaryk
University, Kamenice 5, 625 00 Brno, Czech Republic
- RECETOX,
Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech
Republic
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3
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Hanson JR. Some Recent Reports on the Flavonoids. JOURNAL OF CHEMICAL RESEARCH 2016. [DOI: 10.3184/174751916x14502778885176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Affiliation(s)
- James R. Hanson
- Department of Chemistry, University of Sussex, Brighton, Sussex BNl 9QJ, UK
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