UPLC/QTOF-MS/MS ANALYSIS AND ANTIBACTERIAL ACTIVITY OF Commiphora leptophloeos (Mart.) J. B. Gillett AGAINST MULTI-DRUG RESISTANT Staphylococcus aureus and Pseudomonas aeruginosa

The present study was carried out to determine, for the first time, the chemical composition and antibacterial activity of essential oils derived from the aerial parts of three aromatic plants Thymus algeriensis Boiss & Reut, Rosmarinus officinalis L., and Salvia officinalis L. growing under semiarid conditions. The essential oils were chemically analyzed and identified by gas chromatography (GC) and GC/ mass spectrometry (GC/MS) and their antimicrobial activity was individually evaluated against Staphylococcus aureus, Escherichia coli, and Pseudomonas aeruginosa using both agar disk diffusion and agar dilution methods. The major constituents of Thymus algeriensis essential oil were identified as camphor (13.62%), 1,8-cineol (6.00%), borneol (5.74%), viridiflorol (4.00%), and linalool (3.93%). For Rosmarinus officinalis essential oil, 48 compounds were characterized, of which the main constituents were camphor (17.09%), Z-β-ocimene (10.88%), isoborneol (9.68%), α-bisabolol (7.89%), and borneol (5.11%). While, Salvia officinalis essential oil was characterized by β-thujone (16.44%), followed by viridiflorol (10.93%), camphor (8.99%), 1,8-cineol (8.11%), trans-caryophyllene (5.85%), and α-humulene (4.69%) as the major components. Notably, results from antibacterial screening indicated that Thymus algeriensis and Salvia officinalis essential oils exhibited a strong inhibitory effect against both Escherichia coli and Staphylococcus aureus compared to Rosmarinus officinalis essential oil. Further, less activity was recorded against Pseudomonas aeruginosa for the three tested essential oils.

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Complexes of Cu (II) with a-Ketoglutaric Acid and 1- (o-tolyl) Biguanide Synthesis, characterization and biological Activity

Revista de Chimie ◽

10.37358/rc.19.10.7605 ◽

2019 ◽

Vol 70 (10) ◽

pp. 3603-3610

Author(s):

Madalina Mihalache ◽

Cornelia Guran ◽

Aurelia Meghea ◽

Vasile Bercu ◽

Ludmila Motelica ◽

...

Keyword(s):

Staphylococcus Aureus ◽

Pseudomonas Aeruginosa ◽

Antimicrobial Activity ◽

Antibacterial Activity ◽

Biological Activity ◽

Candida Albicans ◽

Antifungal Activity ◽

Copper Complexes ◽

Substrate Adhesion ◽

Inert Substrate

The three copper complexes having a-ketoglutaric acid (H2A) and 1- (o-tolyl) biguanide (TB) ligands have been synthesized and characterized. The proposed formulas for these complexes are: [Cu(TB)(HA)]Cl (C1), [Cu(TB)(HA)CH3COO]�H2O (C2) and [Cu(TB)(HA)](NO3) (C3) where HA represents deprotonated H2A. The complexes obtained were tested for antibacterial activity against Staphylococcus aureus ATCC 25923 and Pseudomonas aeruginosa ATCC 27853, antifungal activity on Candida albicans ATCC 10231 and antitumor activity on HeLa tumor cells. Due to the antitumor, antifungal, antimicrobial activity and inhibition of inert substrate adhesion, complexes synthesized could be used for potential therapeutic applications.

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New Antimicrobials Based on the Adarotene Scaffold with Activity against Multi-Drug Resistant Staphylococcus aureus and Vancomycin-Resistant Enterococcus

Antibiotics ◽

10.3390/antibiotics10020126 ◽

2021 ◽

Vol 10 (2) ◽

pp. 126

Author(s):

Salvatore Princiotto ◽

Stefania Mazzini ◽

Loana Musso ◽

Fabio Arena ◽

Sabrina Dallavalle ◽

...

Keyword(s):

Staphylococcus Aureus ◽

Antibacterial Activity ◽

Anticancer Activity ◽

Bactericidal Effect ◽

Biological Assessment ◽

Drug Resistant ◽

Vancomycin Resistant Enterococcus ◽

Vancomycin Resistant ◽

Global Increase ◽

Common Infections

The global increase in infections by multi-drug resistant (MDR) pathogens is severely impacting our ability to successfully treat common infections. Herein, we report the antibacterial activity against S. aureus and E. faecalis (including some MDR strains) of a panel of adarotene-related synthetic retinoids. In many cases, these compounds showed, together with favorable MICs, a detectable bactericidal effect. We found that the pattern of substitution on adarotene could be modulated to obtain selectivity for antibacterial over the known anticancer activity of these compounds. NMR experiments allowed us to define the interaction between adarotene and a model of microorganism membrane. Biological assessment confirmed that the scaffold of adarotene is promising for further developments of non-toxic antimicrobials active on MDR strains.

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Jabuticaba skin extracts: phenolic compounds and antibacterial activity

BRAZILIAN JOURNAL OF FOOD TECHNOLOGY ◽

10.1590/1981-6723.10817 ◽

2018 ◽

Vol 21 (0) ◽

Cited By ~ 2

Author(s):

Flávia Cíntia de Oliveira ◽

Tamara Rezende Marques ◽

Gustavo Henrique Andrade Machado ◽

Thaís Cristina Lima de Carvalho ◽

Aline Aparecida Caetano ◽

...

Keyword(s):

Escherichia Coli ◽

Staphylococcus Aureus ◽

Pseudomonas Aeruginosa ◽

Antibacterial Activity ◽

Listeria Monocytogenes ◽

Phenolic Compounds ◽

Methanolic Extract ◽

Ethanolic Extract ◽

Salmonella Choleraesuis ◽

Pharmaceutical Industries

Abstract The phenolic compounds from various extracts of jabuticaba skin powder (JSP) were characterized in this study, and the antibacterial activity assessed. The phenolic compounds were extracted from the JSP using four methods: a) acetone extraction - 1 g JSP: 10 mL 70% acetone, resting for 2 hours; b) aqueous extract - 1 g JSP: 15 mL water, under agitation; c) ethanolic extract - 1 g JSP: 15 mL acidified ethanol, under agitation; and d) methanolic extract - 1 g JSP: 50 mL 50% methanol, under reflux. The antibacterial activity was evaluated by the agar diffusion assay, using Escherichia coli ATCC 11229, Salmonella choleraesuis ATCC 6539, Pseudomonas aeruginosa ATCC 15442, Staphylococcus aureus ATCC 6538 and Listeria monocytogenes ATCC 19117. The ethanolic and methanolic extracts showed the highest levels of phenolic compounds, especially of cyanidin chloride, catechin and epicatechin. The extracts did not inhibit the growth of Escherichia coli and Salmonella choleraesuis, but inhibited 30% of the growth of Pseudomonas aeruginosa with an extract concentration of 250 µg mL-1. Against Staphylococcus aureus and Listeria monocytogenes the highest inhibitory effect observed was 41.8% for the ethanolic extract, followed by 36% inhibition by the methanolic extract, thus revealing the potential of these extracts as possible alternatives for use in the food and/or pharmaceutical industries.

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Quorum Sensing Inhibition in Chromobacterium violaceum, Antibacterial Activity and GC-MS Analysis of Centaurea praecox (Oliv. & Hiern) Extracts

Letters in Applied NanoBioScience ◽

10.33263/lianbs94.15691577 ◽

2020 ◽

Vol 9 (4) ◽

pp. 1569-1577

Keyword(s):

Antibacterial Activity ◽

Quorum Sensing ◽

Research Strategy ◽

Chromobacterium Violaceum ◽

Resistant Bacteria ◽

Drug Resistant ◽

Control Drug ◽

Ms Analysis ◽

Drug Resistant Bacteria

The quorum sensing (QS) mechanism has become a viable research strategy for the discovery of plant-derived anti-virulent agents to control drug-resistant bacteria. The increasing incidences of drug-resistant bacteria and the effort to curb it necessitate this study. We investigated the QS inhibitory potential of Centaurea praecox extracts on Chromobacterium violaceum (CV), antibacterial activity, and determination of chemical composition using GC-MS. C. praecox was subjected to sequential extraction using hexane (HEX), dichloromethane (DCM), ethyl acetate (EA), ethanol (ET), and aqueous (AQ) solvents. The extracts were subsequently evaluated for antibacterial activity using disc diffusion and QS violacein inhibition using spectrophotometry. The antibacterial effects of the extracts were moderate on gram-positive bacteria at 4 mg/mL in the order: HEX >EA >DCM >ET =AQ. However, the DCM extract demonstrated the most effective violacein inhibition of ≥80% at 0.3 mg/mL. QS violacein inhibitions were generally found to be concentration-dependent in the order: DCM >EA >HEX >ET =AQ with efficacies of ≥ 90% inhibition at ≥ 0.6 mg/mL. GC-MS analysis on the most potent DCM extract revealed N-vinylmethanimine, N-ethyl formamide, and propanamide among components identified. We concluded that C. praecox DCM extract contains bioactive chemicals as QS inhibitors and potential anti-virulent agents capable of combating the pathogenicity of drug-resistant bacteria in vivo.

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FLORAL EXTRACT OF Tibouchina granulosa (DESR.) COGN. PHYTOCHEMISTRY PROSPECTION, AND ANTIBACTERIAL ACTIVITY

Ipê Agronomic Journal ◽

10.37951/2595-6906.2021v5i1.6880 ◽

2021 ◽

Vol 5 (1) ◽

pp. 1-9

Author(s):

Antonio Carlos Pereira de Menezes Filho ◽

Matheus Vinícius Abadia Ventura ◽

Carlos Frederico de Souza Castro

Keyword(s):

Escherichia Coli ◽

Staphylococcus Aureus ◽

Pseudomonas Aeruginosa ◽

Antibacterial Activity ◽

Enterococcus Faecalis ◽

Floral Organ ◽

Salt Formation ◽

Bacterial Strains ◽

Positive Results

Tibouchina granulosa is a species that blooms annually in several regions of Brazil. This species is still little explored in terms of phytocompounds in all organs of this plant, especially the floral organ. Flowers of T. granulosa were collected in the municipality of Rio Verde, Goiás, Brazil, in 2021. The hydroethanolic floral extract was prepared by maceration and qualitative phytochemical (colorimetric reactions and salt formation) and antibacterial analyzes performed and the results expressed in millimeters of inhibition at different concentrations in mg mL-1. Several phytochemical classes were observed with positive results, especially for alkaloids, phenolics, oxylates, saponins, carbohydrates and tannins. As for the bacterial assay, potential antibacterial activity was observed for all bacterial strains tested, except for Salmonella serovar Thyphymurium and serovar Enteritidis. Expressive inhibitions were observed for Enterococcus faecalis > Pseudomonas aeruginosa > Staphylococcus aureus and Escherichia coli at the highest concentrations between 100-50 mg mL-1. The floral extract of Tibouchina granulosa showed phytotherapeutic potential with the presence of several phytochemical groups and expressive antibacterial activity.

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GC-MS Analysis and Antibacterial Activity of different Solvent Extracts of Shuteria involucrata

The Journal of Phytopharmacology ◽

10.31254/phyto.2018.7203 ◽

2018 ◽

Vol 7 (2) ◽

pp. 116-120

Author(s):

Senthamizh Selvan N ◽

◽

Isaiah S ◽

Keyword(s):

Staphylococcus Aureus ◽

Antimicrobial Activity ◽

Antibacterial Activity ◽

Ethanolic Extract ◽

Disc Diffusion ◽

Plant Materials ◽

Gram Negative ◽

Good Antibacterial Activity ◽

Ms Analysis ◽

Diffusion Technique

The present study was focused to examine the presence of phytoconstituents in the ethanolic extract of Shuteria involucrata plant using GC-MS analysis and Antibacterial activity. The GC-MS analysis of S. involucrata leaf was performed using Agilent 6890-JEOL GC-Mate-II Mass Spectrometer. The result of the study showed the presence of six bioactive compounds in the ethanolic extract. The antimicrobial activity was carried out by disc diffusion technique against the four selected pathogens. Among the four, tested for Antibacterial Activity Staphylococcus aureus, and Pseudomonas aeruginosa and were more susceptible to the extract, whereas the others are less susceptible. Ethanol and methanol extracts of plant materials exhibited good antibacterial activity against gram positive, gram negative bacterias

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