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Silva RA, da Silva BF, Pereira MS, Coelho PAT, Costa RA, Chaves AC, Silva IGN, Carneiro VA. Combinatorial effects between aromatic plant compounds and chlorhexidine digluconate against canine otitis-related Staphylococcus spp. Res Vet Sci 2024; 170:105182. [PMID: 38377791 DOI: 10.1016/j.rvsc.2024.105182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Revised: 01/22/2024] [Accepted: 02/11/2024] [Indexed: 02/22/2024]
Abstract
The increasing prevalence of antimicrobial resistance among bacterial pathogens necessitates novel treatment strategies, particularly in veterinary medicine where otitis in dogs is very common in small animals' clinical routines. Considering this challenge, this study explores the efficacy of aromatic plant compounds (APC), including eugenol (EUG), trans-cinnamaldehyde (TC), and geraniol (GER), and their synergistic potential when combined with the antiseptic agent chlorhexidine (CLX), offering insight into alternative therapeutic approaches. The disk diffusion assay revealed differential sensitivity of Staphylococcus spp. strains to the tested compounds, with EUG and GER showing moderate inhibition zones and TC displaying considerably larger inhibition zones. Further analysis through MIC and MBC determinations suggested that EUG required the highest concentrations to inhibit and kill the bacteria, whereas TC and GER were effective at lower concentrations. Combined with CLX, all three plant-derived compounds demonstrated a significant enhancement of antibacterial activity, indicated by reduced MIC values and a predominantly synergistic interaction across the strains tested. GER was the most potent in combination with CLX, presenting the lowest mean FICi values and the highest fold reductions in MIC. This study emphasizes the APC's potential as an adjunct to conventional antimicrobial agents like CLX. The marked synergy observed, especially with GER, suggests that such combinations could be promising alternatives in managing bacterial otitis in dogs, potentially mitigating the impact of antibiotic resistance.
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Affiliation(s)
- Romério Alves Silva
- Veterinary Sciences Department of State University of Ceará, Campus Itaperi, Fortaleza 60714-903, Ceará, Brazil
| | - Benise Ferreira da Silva
- Center for Bioprospecting and Applied Molecular Experimentation (NUBEM), Laboratory of Biofilms and Antimicrobial Agents (LaBAM), University Center INTA - UNINTA, Sobral 62.050-100, Brazil
| | - Mainara Saraiva Pereira
- Center for Bioprospecting and Applied Molecular Experimentation (NUBEM), Laboratory of Biofilms and Antimicrobial Agents (LaBAM), University Center INTA - UNINTA, Sobral 62.050-100, Brazil
| | - Paulo Adenes Teixeira Coelho
- Center for Bioprospecting and Applied Molecular Experimentation (NUBEM), Laboratory of Biofilms and Antimicrobial Agents (LaBAM), University Center INTA - UNINTA, Sobral 62.050-100, Brazil
| | - Renata Albuquerque Costa
- Center for Bioprospecting and Applied Molecular Experimentation (NUBEM), Laboratory of Biofilms and Antimicrobial Agents (LaBAM), University Center INTA - UNINTA, Sobral 62.050-100, Brazil
| | - Andrey Carvalho Chaves
- Veterinary Sciences Department of State University of Ceará, Campus Itaperi, Fortaleza 60714-903, Ceará, Brazil
| | - Isaac Goes Neto Silva
- Veterinary Sciences Department of State University of Ceará, Campus Itaperi, Fortaleza 60714-903, Ceará, Brazil
| | - Victor Alves Carneiro
- Center for Bioprospecting and Applied Molecular Experimentation (NUBEM), Laboratory of Biofilms and Antimicrobial Agents (LaBAM), University Center INTA - UNINTA, Sobral 62.050-100, Brazil.
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Hussain S, Javed W, Tajammal A, Khalid M, Rasool N, Riaz M, Shahid M, Ahmad I, Muhammad R, Shah SAA. Synergistic Antibacterial Screening of Cymbopogon citratus and Azadirachta indica: Phytochemical Profiling and Antioxidant and Hemolytic Activities. ACS OMEGA 2023; 8:16600-16611. [PMID: 37214690 PMCID: PMC10193546 DOI: 10.1021/acsomega.2c06785] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Accepted: 03/02/2023] [Indexed: 05/24/2023]
Abstract
Current studies were performed to investigate the phytochemistry, synergistic antibacterial, antioxidant, and hemolytic activities of ethanolic and aqueous extracts of Azadirachta indica (EA and WA) and Cymbopogon citratus (EC and WC) leaves. Fourier transform infrared data verified the existence of alcoholic, carboxylic, aldehydic, phenyl, and bromo moieties in plant leaves. The ethanolic extracts (EA and EC) were significantly richer in phenolics and flavonoids as compared to the aqueous extracts (WA and WC). The ethanolic extract of C. citratus (EC) contained higher concentrations of caffeic acid (1.432 mg/g), synapic acid (6.743 mg/g), and benzoic acid (7.431 mg/g) as compared to all other extracts, whereas chlorogenic acid (0.311 mg/g) was present only in the aqueous extract of A. indica (WA). Food preservative properties of C. citratus can be due to the presence of benzoic acid (7.431 mg/g). -Gas chromatography-mass spectrometry analysis demonstrated the presence of 36 and 23 compounds in A. indica and C. citratus leaves, respectively. Inductively coupled plasma analysis was used to determine the concentration of 26 metals (Al, As, B, Ba, Ca, Cd, Co, Cr, Cu, Fe, K, Mg, Mn, Mo, Na, Ni, Pb, Sb, Se, Si, Sn, Sr, V, Zn, Zr, Ti); the metal concentrations were higher in aqueous extracts as compared to the ethanolic extracts. The extracts were generally richer in calcium (3000-7858 ppm), potassium (13662-53,750 ppm), and sodium (3181-8445 ppm) and hence can be used in food supplements as a source of these metals. Antioxidant potential (DDPH method) of C. citratus ethanolic extract was the highest (74.50 ± 0.66%), whereas it was the lowest (32.22 ± 0.28%) for the aqueous extract of A. indica. Synergistic inhibition of bacteria (Staphylococcus aureus and Escherichia coli) was observed when the aqueous extracts of both the plants were mixed together in certain ratios (v/v). The highest antibacterial potential was exhibited by the pure extract of C. citratus, which was even higher than that of the standard drug (ciprofloxacin). The plant extracts and their mixtures were more active against S. aureus as compared to E. coli. No toxic hemolytic effects were observed for the investigated extracts indicating their safe medicinal uses for human beings.
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Affiliation(s)
- Shabbir Hussain
- Institute
of Chemistry, Khwaja Fareed University of
Engineering and Information Technology, Rahim Yar Khan 64200, Pakistan
| | - Warda Javed
- Department
of Chemistry, Lahore Garrison University, DHA Phase VI, Lahore 54792, Pakistan
| | - Affifa Tajammal
- Department
of Chemistry, Lahore Garrison University, DHA Phase VI, Lahore 54792, Pakistan
| | - Muhammad Khalid
- Institute
of Chemistry, Khwaja Fareed University of
Engineering and Information Technology, Rahim Yar Khan 64200, Pakistan
- Centre
for Theoretical and Computational Research, Khwaja Fareed University of Engineering and Information Technology, Rahim Yar Khan, 64200, Pakistan
| | - Nasir Rasool
- Department
of Chemistry, Government College University, Faisalabad 38000, Pakistan
| | - Muhammad Riaz
- Department
of Basic and Applied Chemistry, Faculty
of Science and Technology University of Central Punjab, Lahore 54000, Pakistan
| | - Muhammad Shahid
- Department
of Chemistry and Biochemistry, University
of Agriculture, Faisalabad 38040, Pakistan
| | - Iqbal Ahmad
- Department
of Chemistry, Allama Iqbal Open University, 44000 Islamabad, Pakistan
| | - Riaz Muhammad
- Department
of Chemistry, Lahore Garrison University, DHA Phase VI, Lahore 54792, Pakistan
| | - Syed Adnan Ali Shah
- Faculty
of Pharmacy, Universiti Teknologi MARA Cawangan
Selangor Kampus Puncak Alam, Bandar Puncak Alam 42300, Selangor D. E., Malaysia
- Atta-ur-Rahman
Institute for Natural Product Discovery (AuRIns), Universiti Teknologi MARA Cawangan Selangor Kampus Puncak Alam, Bandar Puncak Alam 42300, Selangor D. E., Malaysia
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