scholarly journals Synergistic Effects of Artemisia vulgaris, Ocimum tenuiflorum, Azadirachta indica and Castanopsis indica Extracts against Methicillin-Resistant Staphylococcus aureus

2017 ◽  
Vol 5 (1) ◽  
pp. 38-44
Author(s):  
Jyoti Chhetri ◽  
Krishna Gurung ◽  
Abhisek Khadka ◽  
Reeju Sharma ◽  
Mira Kumari Khatri ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Antibacterial Activity ◽  
Medicinal Plant ◽  
Plant Extract ◽  
Antibacterial Agents ◽  
Methicillin Resistant Staphylococcus Aureus ◽  
Synergistic Effects ◽  
Health Concern ◽  
Assay Method ◽  
Methicillin Resistant

Staphylococcus aureus is a major public health concern. Methicillin resistant Staphylococcus aureus is not only resistant to methicillin and other β-lactam antibacterial agents but also to other antibacterial agents. Therefore, new agents are needed to treat Methicillin Resistant Staphylococcus aureus (MRSA). The main aim of the present research was to study the antibacterial activity of four plants extract against clinical isolates of Staphylococcus aureus at the purpose of overcoming its infection. The current investigation was carried out at Pokhara Bigyan tatha Prabidhi Campus based on the evaluation of traditional plants on its antibacterial activity against MRSA. Antibacterial activity of the medicinal plant extract was observed by mixing 100 g powder of collected leaves in 70% methanol making 1000 sml. After performed processes, extract was filtered and methanol was evaporated. Antibacterial activity of the medicinal plant extract was determined using agar well diffusion assay method. Methanol leaf extracts may have the potential to act against MRSA and could be a possible source to obtain new and effective herbal medicines to treat infections caused by methicillin resistant strains of microorganisms from community as well as hospital settings. The synergistic effect was clearly observed among all four medicinal herbs.

Unveiling the bioactivity of Allium triquetrum L. lipophilic fractions: chemical characterization and in vitro antibacterial activity against methicillin-resistant Staphylococcus aureus

2020 ◽  
Vol 11 (6) ◽  
pp. 5257-5265
Author(s):  
Samia Rabah ◽  
Kahina Kouachi ◽  
Patrícia A. B. Ramos ◽  
Ana Peixoto Gomes ◽  
Adelaide Almeida ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Antibacterial Activity ◽  
Antibacterial Agents ◽  
Methicillin Resistant Staphylococcus Aureus ◽  
Chemical Characterization ◽  
Value Added ◽  
Lipophilic Compounds ◽  
Methicillin Resistant ◽  
In Vitro Antibacterial Activity

Allium triquetrum L. bulbs, flowers and leaves are proved to be valuable sources of value-added lipophilic compounds, specifically as antibacterial agents against methicillin-resistant Staphylococcus aureus.

scholarly journals Biofilm Inhibition and Eradication Properties of Medicinal Plant Essential Oils against Methicillin-Resistant Staphylococcus aureus Clinical Isolates

2020 ◽  
Vol 13 (11) ◽  
pp. 369
Author(s):  
Fethi Ben Abdallah ◽  
Rihab Lagha ◽  
Ahmed Gaber
Keyword(s):  
Staphylococcus Aureus ◽  
Antibacterial Activity ◽  
Medicinal Plant ◽  
Essential Oils ◽  
Methicillin Resistant Staphylococcus Aureus ◽  
Clinical Isolates ◽  
Mass Spectrometry Analysis ◽  
Biofilm Inhibition ◽  
Methicillin Resistant ◽  
Plant Essential Oils

Methicillin-resistant Staphylococcus aureus is a major human pathogen that poses a high risk to patients due to the development of biofilm. Biofilms, are complex biological systems difficult to treat by conventional antibiotic therapy, which contributes to >80% of humans infections. In this report, we examined the antibacterial activity of Origanum majorana, Rosmarinus officinalis, and Thymus zygis medicinal plant essential oils against MRSA clinical isolates using disc diffusion and MIC methods. Moreover, biofilm inhibition and eradication activities of oils were evaluated by crystal violet. Gas chromatography–mass spectrometry analysis revealed variations between oils in terms of component numbers in addition to their percentages. Antibacterial activity testing showed a strong effect of these oils against MRSA isolates, and T. zygis had the highest activity succeeded by O. majorana and R. officinalis. Investigated oils demonstrated high biofilm inhibition and eradication actions, with the percentage of inhibition ranging from 10.20 to 95.91%, and the percentage of eradication ranging from 12.65 to 98.01%. O. majorana oil had the highest biofilm inhibition and eradication activities. Accordingly, oils revealed powerful antibacterial and antibiofilm activities against MRSA isolates and could be a good alternative for antibiotics substitution.

scholarly journals A Molecular Insight into the Synergistic Mechanism of Nigella sativa (Black Cumin) with β-Lactam Antibiotics against Clinical Isolates of Methicillin-Resistant Staphylococcus aureus

2021 ◽  
Vol 11 (7) ◽  
pp. 3206
Author(s):  
Lorina I. Badger-Emeka ◽  
Promise Madu Emeka ◽  
Hairul Islam M. Ibrahim
Keyword(s):  
Staphylococcus Aureus ◽  
Mechanism Of Action ◽  
Methicillin Resistant Staphylococcus Aureus ◽  
Nigella Sativa ◽  
Synergistic Effects ◽  
Diffusion Method ◽  
Methicillin Resistant ◽  
Cell Wall Disruption ◽  
Time Kill ◽  
Insight Into

Methicillin-resistant Staphylococcus aureus (MRSA) infection is detrimental to hospitalized patients. With diminishing choices of antibiotics and the worry about resistance to colistin in synergistic combined therapy, there are suggestions for the use of herbal derivatives. This investigation evaluated the synergistic effects of Nigella sativa (NS) in combination with beta-lactam (β-lactam) antibiotics on extreme drug-resistant (XDR) MRSA isolates. NS concentrations of 10, 7.5, 5.0, 2.5, 1.0, and 0.1 µg/mL, alone and in combination with β-lactam antibiotics, were used to determine the antimicrobial susceptibility of MRSA isolates by the well diffusion method. Time–kill assays were performed using a spectrophotometer, with time–kill curves plotted and synergism ascertained by the fractional inhibitory concentration (FIC). Scanning and transmission electron microscopy were used to gain insight into the mechanism of action of treated groups. Isolates were inhibited by the NS concentrations, with differences in the zones of inhibition being statistically insignificant at p < 0.05. There were statistically significant differences in the time–kill assay for the MRSA isolates. In addition, NS combined with augmentin showed better killing than oxacillin and cefuroxime. The mechanism of action shown by the SEM and TEM results revealed cell wall disruption, which probably created interference that led to bacterial lysis.

scholarly journals Trans-Cinnamaldehyde Exhibits Synergy with Conventional Antibiotic against Methicillin-Resistant Staphylococcus aureus

2021 ◽  
Vol 22 (5) ◽  
pp. 2752
Author(s):  
Shu Wang ◽  
Ok-Hwa Kang ◽  
Dong-Yeul Kwon
Keyword(s):  
Staphylococcus Aureus ◽  
Methicillin Resistant Staphylococcus Aureus ◽  
Synergistic Effects ◽  
Regulatory Gene ◽  
Western Blot Assay ◽  
Methicillin Resistant ◽  
Wide Range ◽  
Kill Curve ◽  
Conventional Antibiotics ◽  
Time Kill

Methicillin-resistant Staphylococcus aureus (MRSA) is a major nosocomial pathogen worldwide and has acquired multiple resistance to a wide range of antibiotics. Hence, there is a pressing need to explore novel strategies to overcome the increase in antimicrobial resistance. The present study aims to investigate the efficacy and mechanism of plant-derived antimicrobials, trans-cinnamaldehyde (TCA) in decreasing MRSA’s resistance to eight conventional antibiotics. A checkerboard dilution test and time–kill curve assay are used to determine the synergistic effects of TCA combined with the antibiotics. The results indicated that TCA increased the antibacterial activity of the antibiotics by 2-16-fold. To study the mechanism of the synergism, we analyzed the mecA transcription gene and the penicillin-binding protein 2a level of MRSA treated with TCA by quantitative RT-PCR or Western blot assay. The gene transcription and the protein level were significantly inhibited. Additionally, it was verified that TCA can significantly inhibit the biofilm, which is highly resistant to antibiotics. The expression of the biofilm regulatory gene hld of MRSA after TCA treatment was also significantly downregulated. These findings suggest that TCA maybe is an exceptionally potent modulator of antibiotics.

Antibacterial Activity of Ecklonia cava Against Methicillin-Resistant Staphylococcus aureus and Salmonella spp.

2010 ◽  
Vol 7 (4) ◽  
pp. 435-441 ◽  
Author(s):  
Jang-Gi Choi ◽  
Ok-Hwa Kang ◽  
Obiang-Obounou Brice ◽  
Young-Seob Lee ◽  
Hee-Sung Chae ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Antibacterial Activity ◽  
Methicillin Resistant Staphylococcus Aureus ◽  
Ecklonia Cava ◽  
Salmonella Spp ◽  
Methicillin Resistant

Antibacterial activity of aminoderivatized chitosans against methicillin-resistant Staphylococcus aureus (MRSA)

2009 ◽  
Vol 17 (20) ◽  
pp. 7108-7112 ◽  
Author(s):  
Dae-Sung Lee ◽  
Seong-Yun Jeong ◽  
Young-Mog Kim ◽  
Myung-Suk Lee ◽  
Chang-Bum Ahn ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Antibacterial Activity ◽  
Methicillin Resistant Staphylococcus Aureus ◽  
Methicillin Resistant
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