Antibacterial Activity and Phytochemical Screening of Garcinia pedunculata Roxb. ex Buch. - Ham. fruit extract by HPLC–ESI-MS

Antibiotic Sensitivity Test

Disc and well diffusion methods were used to test the antibacterial activity of methanol extract and ethanol extract of the selected ethnomedicinal plant viz. Garcinia pedunculata Roxb. ex Buch.-Ham. Both the methanol extract and ethanol extract were subjected to antibacterial activity assay against the six clinical isolates. Antibiotic sensitivity test of the test bacteria against standard antibiotics were also determined. All the bacterial pathogens (Staphylococcus aureus, Enterococcus faecalis, Enterobacter cloacae, Escherichia coli, Pseudomonas aeruginosa and Klebsiella pneumoniae) were exposed to the plant extract in triplicates. The investigation revealed the potency of G. pedunculata extract as an effective antibacterial agent against both Gram-positive bacteria (GPB) and Gram-negative bacteria (GNB). G. pedunculata are evaluated to be bactericidal against the tested bacteria. The antibacterial activity may be due to an individual compound or synergistic effect of more than one compound present in the medicinal plant extract. The minimum inhibitory concentrations (MIC) and minimum bactericidal concentrations (MBC) of the plant extracts were also investigated by using the broth microdilution method. HPLC-MS of the methanol extract of G. pedunculata fruit revealed the presence of Hydroxy Citric Acid Lactone (MW-190), Garcinone-E (MW-464), a-Mangostin (MW-410), β–Mangostin (MW-424), and γ-Mangostin (MW-396).

Antibacterial and synergistic effects of aqueous and methanol extracts of Artemisia annua against multidrug-resistant isolates of Acinetobacter

Anti-Infective Agents ◽

10.2174/2211352518999200525002520 ◽

2020 ◽

Vol 18 ◽

Cited By ~ 1

Author(s):

Hanieh Shadifar ◽

Masoumeh Bahreini ◽

Bahman Khamaneh ◽

Seyed Ahmad Emami ◽

Narges Fatemi ◽

...

Keyword(s):

Antibacterial Activity ◽

Infectious Diseases ◽

Plant Extract ◽

Methanol Extract ◽

Efflux Pump ◽

Artemisia Annua ◽

Synergistic Effects ◽

Multidrug Resistant ◽

Microdilution Method ◽

Broth Microdilution Method

Background: Acinetobacter is one of the most important pathogens that causes high prevalence of infection in clinical centers. Natural products are major sources of new anti-infective agents and considered as an alternative medicine for the treatment of infectious diseases. Objective: This study aims to evaluate the antibacterial activity of aqueous and methanol extract of Artemisia annua on the clinically isolated Acinetobacter and the combination of the plant extract with amikacin and imipenem. Methods: The aqueous and methanol extract of the aerial parts of this plant was prepared by maceration. Antibacterial activity was determined by the Broth microdilution method. The presence of adeI and adeB genes in Acinetobacter isolates was investigated. The combination effects of antibiotics were performed using the checkerboard method. The effect of plant extract on bacterial efflux pumps was also investigated. Results: MIC values of the methanol extract of A. annua were from 4.46 mg/ml to 8.92 mg/ml. The effects of the interaction of the plant extract with the amikacin and imipenem represent a significant synergistic influence. Findings indicated that the plant extract was able to inhibit the efflux pump remarkably. Conclusion: The combination of the plant extract with amikacin and imipenem can be used in the treatment of infections caused by antibiotic-resistant Acinetobacter and probably other infectious diseases.

Antibacterial Triterpenoids from the Bark of Sonneratia alba (Lythraceae)

10.1177/1934578x1501000215 ◽

2015 ◽

Vol 10 (2) ◽

pp. 1934578X1501000

Author(s):

Harizon ◽

Betry Pujiastuti ◽

Dikdik Kurnia ◽

Dadan Sumiarsa ◽

Yoshihito Shiono ◽

...

Keyword(s):

Staphylococcus Aureus ◽

Antibacterial Activity ◽

Mass Spectrometric ◽

Broth Microdilution ◽

Mass Spectrometric Data ◽

Spectrometric Data ◽

Gram Positive Bacteria ◽

Microdilution Method ◽

Sonneratia Alba ◽

Broth Microdilution Method

The new lupane-type triterpenoid, 3β-hydroxy-lup-9(11), 12-diene, 28-oic acid (1), along with two known lupane-type triterpenoids, lupeol (2) and lupan-3p-ol (3), were isolated from the bark of Sonnetaria alba. The structure of the new compound was elucidated on the basis of spectroscopic and mass spectrometric data analysis. Using the broth microdilution method, all compounds exhibited antibacterial activity against the Gram-positive bacteria Staphylococcus aureus ATCC 6538 and Streptococcus mutans ATCC 25175, with minimum inhibitory concentrations ranging from 15-33 to 35-55 ng/mL, respectively.

Antibacterial Activity of the Essential Oil of Heracleum Sibiricum

10.1177/1934578x1300800931 ◽

2013 ◽

Vol 8 (9) ◽

pp. 1934578X1300800 ◽

Cited By ~ 4

Author(s):

Dragoljub L. Miladinović ◽

Budimir S. Ilić ◽

Tatjana M. Mihajilov-Krstev ◽

Dejan M. Nikolić ◽

Olga G. Cvetković ◽

...

Keyword(s):

Antibacterial Activity ◽

Essential Oil ◽

Antimicrobial Activities ◽

Bacterial Strains ◽

Gram Positive Bacteria ◽

Microdilution Method ◽

Major Chemical ◽

Total Oil ◽

Chemical Class

The composition and antimicrobial activity of the essential oil of Heracleum sibiricum L. (Apiaceae) was studied. The aerial part of plant was hydro-distilled and chemical composition of the essential oil was analyzed by GC and GC-MS. Forty-six compounds, corresponding to 95.12% of the total oil, were identified. Esters represented the major chemical class (69.55%) while the main constituents were octyl butanoate (36.82%), hexyl butanoate (16.08%), 1-octanol (13.62%) and octyl hexanoate (8.10%). Antibacterial activity of the essential oil and reference antibiotics against nine bacterial strains was tested by the broth microdilution method. The results of the bioassays showed that essential oil had slight antimicrobial activities against all tested microorganisms (MIC and MBC values were in the range of 2431.2 to 9724.8 μg/mL). Reference antibiotics were active in concentrations between 0.5 and 16.0 μg/mL. The results confirm that Gram-positive bacteria were more susceptible to the essential oil of H. sibiricum, in comparison with Gram-negative bacteria.

Phytochemical Analysis and Antimicrobial, Antinociceptive, and Anti-Inflammatory Activities of Two Chemotypes ofPimenta pseudocaryophyllus(Myrtaceae)

Evidence-based Complementary and Alternative Medicine ◽

10.1155/2012/420715 ◽

2012 ◽

Vol 2012 ◽

pp. 1-15 ◽

Cited By ~ 13

Author(s):

Joelma Abadia Marciano de Paula ◽

Maria do Rosário Rodrigues Silva ◽

Maysa P. Costa ◽

Danielle Guimarães Almeida Diniz ◽

Fabyola A. S. Sá ◽

...

Keyword(s):

Antimicrobial Activity ◽

Essential Oils ◽

Folk Medicine ◽

Ethanol Extract ◽

Phytochemical Analysis ◽

Gram Positive Bacteria ◽

Microdilution Method ◽

Anti Inflammatory ◽

Ethanol Extracts

Preparations fromPimenta pseudocaryophyllus(Gomes) L.R. Landrum (Myrtaceae) have been widely used in Brazilian folk medicine. This study aims to evaluate the antimicrobial activity of the crude ethanol extracts, fractions, semipurified substances, and essential oils obtained from leaves of two chemotypes ofP. pseudocaryophyllusand to perform the antinociceptive and anti-inflammatory screening. The ethanol extracts were purified by column chromatography and main compounds were spectrally characterised (1D and 2D1H and13C NMR). The essential oils constituents were identified by GC/MS. The broth microdilution method was used for testing the antimicrobial activity. The abdominal contortions induced by acetic acid and the ear oedema induced by croton oil were used for screening of antinociceptive and anti-inflammatory activities, respectively. The phytochemical analysis resulted in the isolation of pentacyclic triterpenes, flavonoids, and phenol acids. The oleanolic acid showed the best profile of antibacterial activity for Gram-positive bacteria (31.2–125 μg mL−1), followed by the essential oil of the citral chemotype (62.5–250 μg mL−1). Among the semipurified substances,Ppm5, which contained gallic acid, was the most active forCandidaspp. (31.2 μg mL−1) andCryptococcusspp. (3.9–15.6 μg mL−1). The crude ethanol extract and fractions from citral chemotype showed antinociceptive and anti-inflammatory effects.

An Efflux Pumps Inhibitor Significantly Improved the Antibacterial Activity of Botanicals from Plectranthus glandulosus towards MDR Phenotypes

The Scientific World JOURNAL ◽

10.1155/2021/5597524 ◽

2021 ◽

Vol 2021 ◽

pp. 1-8

Author(s):

Gravalain Nanmeni ◽

Alex T. Tedonkeu ◽

Aimé G. Fankam ◽

Armelle T. Mbaveng ◽

Brice E. N. Wamba ◽

...

Keyword(s):

Antibacterial Activity ◽

Efflux Pump ◽

Ethanol Extract ◽

Efflux Pumps ◽

Multidrug Resistant ◽

Spectroscopic Techniques ◽

Efflux Pump Inhibitor ◽

Phytochemical Study ◽

Microdilution Method ◽

Broth Microdilution Method

Bacterial multidrug resistance causes many therapeutic failures, making it more difficult to fight against bacterial diseases. This study aimed to investigate the antibacterial activity of extract, fractions, and phytochemicals from Plectranthus glandulosus (Lamiaceae) against multidrug-resistant (MDR) Gram-negative phenotypes expressing efflux pumps. The crude extract after extraction was subjected to column chromatography, and the structures of the isolated compounds were determined using spectrometric and spectroscopic techniques. Antibacterial assays of samples alone and in the presence of an efflux pump inhibitor (phenylalanine-arginine β-naphthylamide, PAβN) were carried out using the broth microdilution method. The phytochemical study of P. glandulosus plant extract afforded seven major fractions (A–G) which lead to the isolation of seventeen known compounds. The ethanol extract of P. glandulosus was not active at up to 1024 μg/mL, whereas its fractions showed MICs varying from 32 to 512 μg/mL on the studied bacteria. Fraction C of P. glandulosus showed the lowest MIC (32 μg/mL) on E. coli ATCC8739 strain. Fraction D presented the highest activity spectrum by inhibiting the growth of 90% (9/10) of the studied bacteria. The presence of PAβN has improved the activity of extract and all fractions. Overall, the tested phytochemicals showed low activity against the studied bacteria. The overall results obtained in this study show that some fractions from P. glandulosus, mainly fractions C and D, should be investigated more for their possible use to fight against MDR bacteria.

Synthesis and Antibacterial Activities of Amidine Substituted Monocyclic β-Lactams

Medicinal Chemistry ◽

10.2174/1573406417666210830122954 ◽

2021 ◽

Vol 17 ◽

Author(s):

Lijuan Zhai ◽

Lili He ◽

Yuanbai Liu ◽

Ko Ko Myo ◽

Zafar Iqbal ◽

...

Keyword(s):

Antibacterial Activity ◽

Bacterial Species ◽

Antimicrobial Effect ◽

Antibacterial Activities ◽

Lead Target ◽

Bacterial Strains ◽

Microdilution Method ◽

Clinical Interest

Background: Mononcyclic β-lactams are regarded as the most resistant class of β-lactams against a series of β-lactamases though possess limited antibacterial activity. Aztreonam being the first clinically approved monobactam needs broad-spectrum efficacy through structural modification. Objective: We strive to synthesize a number of monocyclic β-lactams by varying the substituents at N1, C3 and C4 positions of azetidinone ring and study the antimicrobial effect on variable bacterial strains. Methods: Seven new monobactam derivatives 23a-g, containing substituted-amidine moieties linked to the azetidinone ring via thiazole linker, were synthesized through multistep synthesis. The final compounds were investigated for their in vitro antibacterial activities using broth microdilution method, against ten bacterial strains of clinical interest. The minimum inhibitory concentrations (MICs) of newly synthesized derivatives were compared with aztreonam, ceftazidime and meropenem, existing clinical antibiotics. Results: All compounds 23a-g showed higher antibacterial activities (MIC 0.25 µg/mL to 64 µg/mL) against tested strains as compared to aztreonam (MIC 16 µg/mL to >64 µg/mL) and ceftazidime (MIC >64 µg/mL). However all compounds, except 23d, exhibited lower antibacterial activity against all tested bacterial strains as compared to meropenem. Conclusion: Compound 23d showed comparable or improved antibacterial activity (MIC 0.25 µg/mL to 2 µg/mL) to meropenem (MIC 1 µg/mL to 2 µg/mL) in case of seven bacterial species. Therefore, compound 23d may be valuable lead target for further investigations against multi-drug resistant Gram-negative bacteria.

In Vitro Activity of Eravacycline against Gram-Positive Bacteria Isolated in Clinical Laboratories Worldwide from 2013 to 2017

Antimicrobial Agents and Chemotherapy ◽

10.1128/aac.01715-19 ◽

2019 ◽

Vol 64 (3) ◽

Cited By ~ 1

Author(s):

Ian Morrissey ◽

Stephen Hawser ◽

Sibylle H. Lob ◽

James A. Karlowsky ◽

Matteo Bassetti ◽

...

Keyword(s):

Antimicrobial Agents ◽

Clinical Isolates ◽

Gram Positive ◽

Content Type ◽

Gram Positive Bacteria ◽

Microdilution Method ◽

Clinical Laboratories ◽

Doubling Dilution

ABSTRACT Eravacycline is a novel, fully synthetic fluorocycline antibiotic being developed for the treatment of serious infections, including those caused by resistant Gram-positive pathogens. Here, we evaluated the in vitro activities of eravacycline and comparator antimicrobial agents against a recent global collection of frequently encountered clinical isolates of Gram-positive bacteria. The CLSI broth microdilution method was used to determine in vitro MIC data for isolates of Enterococcus spp. (n = 2,807), Staphylococcus spp. (n = 4,331), and Streptococcus spp. (n = 3,373) isolated primarily from respiratory, intra-abdominal, urinary, and skin specimens by clinical laboratories in 37 countries on three continents from 2013 to 2017. Susceptibilities were interpreted using both CLSI and EUCAST breakpoints. There were no substantive differences (a >1-doubling-dilution increase or decrease) in eravacycline MIC90 values for different species/organism groups over time or by region. Eravacycline showed MIC50 and MIC90 results of 0.06 and 0.12 μg/ml, respectively, when tested against Staphylococcus aureus, regardless of methicillin susceptibility. The MIC90 values of eravacycline for Staphylococcus epidermidis and Staphylococcus haemolyticus were equal (0.5 μg/ml). The eravacycline MIC90s for Enterococcus faecalis and Enterococcus faecium were 0.06 μg/ml and were within 1 doubling dilution regardless of the vancomycin susceptibility profile. Eravacycline exhibited MIC90 results of ≤0.06 μg/ml when tested against Streptococcus pneumoniae and beta-hemolytic and viridans group streptococcal isolates. In this surveillance study, eravacycline demonstrated potent in vitro activity against frequently isolated clinical isolates of Gram-positive bacteria (Enterococcus, Staphylococcus, and Streptococcus spp.), including isolates collected over a 5-year period (2013 to 2017), underscoring its potential benefit in the treatment of infections caused by common Gram-positive pathogens.

Chemical Composition and Antimicrobial Activity of Anthriscus nemorosa Root Essential Oil

10.1177/1934578x1100600229 ◽

2011 ◽

Vol 6 (2) ◽

pp. 1934578X1100600

Author(s):

Milica Pavlović ◽

Silvana Petrović ◽

Marina Milenković ◽

Maria Couladis ◽

Olga Tzakou ◽

...

Keyword(s):

Antimicrobial Activity ◽

Essential Oil ◽

Gram Positive Bacteria ◽

Microdilution Method ◽

Bacillus Subtilis Atcc ◽

Germacrene D ◽

Main Components ◽

Total Oil ◽

Root Essential Oil

The essential oil obtained by hydrodistillation from the roots of Anthriscus nemorosa (Bieb.) Sprengel (Umbelliferae) was analyzed by GC and GC-MS. Among sixty-two compounds identified (representing 89.0% of the total oil), the main components were: n-nonane (12.1%), n-hexadecanol (6.9%), δ-cadinene (6.4%), β-pinene (6.0%) and germacrene D (5.4%). Furthermore, the antimicrobial activity of the oil was evaluated against the Gram-positive bacteria Staphylococcus epidermidis (ATCC 12228) and Bacillus subtilis (ATCC 6633), the Gramnegative bacterium Escherichia coli (ATCC 25922), and a yeast Candida albicans (ATCC 10259 and ATCC 24433) using the broth microdilution method.

Antibacterial Activity of 2-(3’,5'-Dibromo-2'-methoxyphenoxy)-3,5-dibromophenol Isolated from Phyllospongia papyracea

10.1177/1934578x1701200426 ◽

2017 ◽

Vol 12 (4) ◽

pp. 1934578X1701200 ◽

Cited By ~ 1

Author(s):

Shi Sun ◽

Corene Canning ◽

Kuiwu Wang ◽

Wenjun Zhu ◽

Fei Yang ◽

...

Keyword(s):

Antibacterial Agents ◽

Inhibitory Concentration ◽

Methanol Extract ◽

Minimal Bactericidal Concentration ◽

Antimicrobial Compound ◽

Highly Active ◽

Microdilution Method ◽

Bioassay Guided Fractionation ◽

And Staphylococcus Aureus

A principal active antimicrobial compound, 2-(3’,5'-dibromo-2'-methoxyphenoxy)-3,5-dibromophenol, was isolated from the methanol extract of Phyllospongia papyracea via bioassay-guided fractionation and isolation. The crude extract and the purified compound were assayed to determine the minimal inhibitory concentration and minimal bactericidal concentration (MBC) using the broth microdilution method. The purified compound was found to be highly active against Bacillus subtilis and Staphylococcus aureus at MIC=1 μg/mL, Campylobacter jejuni at MIC=2 μg/mL, Pseudomonas aeruginosa at MIC=4 μg/mL, and Streptococcus pneumoniae and Listeria monocytogenes at MIC = 8 μg/mL. The activity of this compound was found to be comparable with antibiotics commonly used to control these species of bacteria. The results establish 2-(3’,5'-dibromo-2'-methoxyphenoxy)-3,5-dibromophenol as a potential lead molecule for the development of antibacterial agents.

STUDY ON THE ANTIBACTERIAL ACTIVITY OF FRUIT EXTRACTS OF KLUTUK BANANA (MUSA BALBISIANA COLLA) AGAINST SHIGELLA DYSENTERIAE ATCC 13313

Asian Journal of Pharmaceutical and Clinical Research ◽

10.22159/ajpcr.2017.v10i7.18561 ◽

2017 ◽

Vol 10 (7) ◽

pp. 220 ◽

Cited By ~ 5

Author(s):

Sriagung Fitri Kusuma ◽

Soraya R Mita ◽

Indah Firdayani ◽

Resmi Mustarichie

Keyword(s):

Antibacterial Activity ◽

Thin Layer ◽

Ethanol Extract ◽

Shigella Dysenteriae ◽

Thin Layer Plate ◽

Phytochemical Analysis ◽

Banana Fruit ◽

Musa Balbisiana ◽

Fruit Extracts ◽

Microdilution Method

Objective: The purpose of this study is to determine the antibacterial activity of Klutuk Banana (Musa balbisiana colla) fruit extracts against Shigella dysenteriae ATCC 13313 and the amount of potassium to the discovery of anti-dysentery drug candidates.Methods: The simplisia of Klutuk banana fruit was extracted with ethanol using a maceration method. The phytochemical screening of ethanol extract was performed using standard procedures. Determination thin layer chromatography (TLC) profile of the extract was performed using a thin layer plate. The antibacterial activity was investigated using agar well diffusion technique. The minimum inhibitory concentrations (MIC) were determined by a serial microdilution method, whereas the minimum bactericidal concentration (MBC) was done by subculturing the MIC result onto agar medium. Potassium levels of the extract were carried out quantitatively using atomic absorption spectrophotometry.Results: The phytochemical analysis revealed the presence of flavonoids, polyphenols, tannins, monoterpenoid and sesquiterpenoids, quinones, and saponins. The TLC results prove the existence of flavonoids in the tested extract. The content of secondary metabolites that can act as an antibacterial, strengthen the antibacterial activity of ethanol extract of Klutuk banana against S. dysenteriae 13313 with MBC values in the range of 5-10%w/v. Potassium levels in the ethanol extract of Klutuk banana fruits contain potassium as much as 2.919% (29 190 ppm).Conclusion: It can be concluded that the ethanol extract of Klutuk banana fruits is more potent as antibacterial against S. dysenteriae than as potassium supplier in hypokalemia therapy.