scholarly journals Chemical Composition and Biological Activities of Metabolites from the Marine Fungi Penicillium sp. Isolated from Sediments of Co To Island, Vietnam

Molecules ◽  
2019 ◽  
Vol 24 (21) ◽  
pp. 3830
Author(s):  
Hong Le ◽  
Quynh Do ◽  
Mai Doan ◽  
Quyen Vu ◽  
Mai Nguyen ◽  
...  
Keyword(s):  
Minimum Inhibitory Concentration ◽  
Secondary Metabolites ◽  
Inhibitory Concentration ◽  
Biological Activities ◽  
2D Nmr ◽  
Inhibitory Effect ◽  
Marine Microorganisms ◽  
Penicillium Species ◽  
E Coli ◽  
Strong Inhibitory Effect

Marine microorganisms are an invaluable source of novel active secondary metabolites possessing various biological activities. In this study, the extraction and isolation of the marine sediment Penicillium species collected in Vietnam yielded ten secondary metabolites, including sporogen AO-1 (1), 3-indolecarbaldehyde (2), 2-[(5-methyl-1,4-dioxan-2-yl)methoxy]ethanol (3), 2-[(2R-hydroxypropanoyl)amino]benzamide (4), 4-hydroxybenzandehyde (5), chrysogine (6), 3-acetyl-4-hydroxycinnoline (7), acid 1H-indole-3-acetic (8), cyclo (Tyr-Trp) (9), and 2’,3’-dihydrosorbicillin (10). Their structures were identified by the analysis of 1D and 2D NMR data. Among the isolated compounds, 2-[(5-methyl-1,4-dioxan-2-yl)methoxy]ethanol (3) showed a strong inhibitory effect against Enterococcus faecalis with a minimum inhibitory concentration value of 32 µg/mL. Both 2-[(2R-hydroxypropanoyl)amino]benzamide (4) and 4-hydroxybenzandehyde (5) selectively inhibited E. coli with minimum inhibitory concentration values of 16 and 8 µg/mL, respectively. 2’,3’-Dihydrosorbicillin (10) potentially inhibited α-glucosidase activity at a concentration of 2.0 mM (66.31%).

scholarly journals Two New Piperazine-Triones from a Marine-Derived Streptomycetes sp. Strain SMS636

Marine Drugs ◽  
2019 ◽  
Vol 17 (3) ◽  
pp. 186 ◽  
Author(s):  
Xiuli Xu ◽  
Jiahui Han ◽  
Rui Lin ◽  
Steven Polyak ◽  
Fuhang Song
Keyword(s):  
Staphylococcus Aureus ◽  
Minimum Inhibitory Concentration ◽  
Secondary Metabolites ◽  
Deep Sea ◽  
Spectroscopic Analysis ◽  
Inhibitory Concentration ◽  
2D Nmr ◽  
Antibacterial Activities ◽  
Bacillus Calmette Guerin ◽  
Methicillin Resistant

Two new piperazine-triones lansai E and F (1, 2), together with four known secondary metabolites lansai D (3), 1-N-methyl-(E,Z)-albonoursin (4), imidazo[4,5-e]-1,2,4-triazine (5), and streptonigrin (6) were isolated from a deep-sea-derived Streptomycetes sp. strain SMS636. The structures of the isolated compounds were confirmed by comprehensive spectroscopic analysis, including HRESIMS, 1D and 2D NMR. Compound 4 exhibited moderate antibacterial activities against Staphylococcus aureus and methicillin resistant S. aureus (MRSA) with Minimum Inhibitory Concentration (MIC) values of 12.5 and 25 μg/mL, respectively. Compound 6 displayed significant antibacterial activities against S. aureus, MRSA and Bacillus Calmette-Guérin (BCG) with MIC values of 0.78, 0.78 and 1.25 μg/mL, respectively.

In Vitro Antibacterial activity of ethanolic extract of Myrsine africana against laboratory Strains of Pathogenic Organisms

2016 ◽  
Vol 5 (04) ◽  
pp. 4512
Author(s):  
Jackie K. Obey ◽  
Anthoney Swamy T* ◽  
Lasiti Timothy ◽  
Makani Rachel
Keyword(s):  
Antibacterial Activity ◽  
Minimum Inhibitory Concentration ◽  
Inhibitory Concentration ◽  
Ethanolic Extract ◽  
Ethanol Extract ◽  
E Coli ◽  
Zones Of Inhibition ◽  
In Vitro Antibacterial Activity ◽  
Myrsine Africana

The determination of the antibacterial activity (zone of inhibition) and minimum inhibitory concentration of medicinal plants a crucial step in drug development. In this study, the antibacterial activity and minimum inhibitory concentration of the ethanol extract of Myrsine africana were determined for Escherichia coli, Bacillus cereus, Staphylococcus epidermidis and Streptococcus pneumoniae. The zones of inhibition (mm±S.E) of 500mg/ml of M. africana ethanol extract were 22.00± 0.00 for E. coli,20.33 ±0.33 for B. cereus,25.00± 0.00 for S. epidermidis and 18. 17±0.17 for S. pneumoniae. The minimum inhibitory concentration(MIC) is the minimum dose required to inhibit growth a microorganism. Upon further double dilution of the 500mg/ml of M. africana extract, MIC was obtained for each organism. The MIC for E. coli, B. cereus, S. epidermidis and S. pneumoniae were 7.81mg/ml, 7.81mg/ml, 15.63mg/ml and 15.63mg/ml respectively. Crude extracts are considered active when they inhibit microorganisms with zones of inhibition of 8mm and above. Therefore, this study has shown that the ethanol extract of M. africana can control the growth of the four organisms tested.

scholarly journals Transcriptome analysis of Escherichia coli K1 after therapy with hesperidin conjugated with silver nanoparticles

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Abdulkader Masri ◽  
Naveed Ahmed Khan ◽  
Muhammad Zarul Hanifah Md Zoqratt ◽  
Qasim Ayub ◽  
Ayaz Anwar ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Silver Nanoparticles ◽  
Minimum Inhibitory Concentration ◽  
Inhibitory Concentration ◽  
Neonatal Meningitis ◽  
E Coli ◽  
Drug Candidates ◽  
Metabolic Genes ◽  
Genetic Mechanisms ◽  
Cell Stress Response

Abstract Backgrounds Escherichia coli K1 causes neonatal meningitis. Transcriptome studies are indispensable to comprehend the pathology and biology of these bacteria. Recently, we showed that nanoparticles loaded with Hesperidin are potential novel antibacterial agents against E. coli K1. Here, bacteria were treated with and without Hesperidin conjugated with silver nanoparticles, and silver alone, and 50% minimum inhibitory concentration was determined. Differential gene expression analysis using RNA-seq, was performed using Degust software and a set of genes involved in cell stress response and metabolism were selected for the study. Results 50% minimum inhibitory concentration with silver-conjugated Hesperidin was achieved with 0.5 μg/ml of Hesperidin conjugated with silver nanoparticles at 1 h. Differential genetic analysis revealed the expression of 122 genes (≥ 2-log FC, P< 0.01) in both E. coli K1 treated with Hesperidin conjugated silver nanoparticles and E. coli K1 treated with silver alone, compared to untreated E. coli K1. Of note, the expression levels of cation efflux genes (cusA and copA) and translocation of ions, across the membrane genes (rsxB) were found to increase 2.6, 3.1, and 3.3- log FC, respectively. Significant regulation was observed for metabolic genes and several genes involved in the coordination of flagella. Conclusions The antibacterial mechanism of nanoparticles maybe due to disruption of the cell membrane, oxidative stress, and metabolism in E. coli K1. Further studies will lead to a better understanding of the genetic mechanisms underlying treatment with nanoparticles and identification of much needed novel antimicrobial drug candidates.

Preparation and disinfection properties of graphene oxide/trichloroisocyanuric acid disinfectant

2021 ◽  
Author(s):  
li li jiang ◽  
Su Xu ◽  
Haitao Yu ◽  
Qi Cui ◽  
Rui Cao
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
Minimum Inhibitory Concentration ◽  
Inhibitory Concentration ◽  
Kinetic Curve ◽  
X Ray ◽  
Bacterial Inhibition ◽  
E Coli ◽  
Blending Method ◽  
Trichloroisocyanuric Acid

Abstract In this study, graphene oxide (GO) was first prepared by the modified Hummer method. Then, the GO/trichloroisocyanuric acid (TCCA) composite was prepared by loading TCCA into GO with the blending method. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy and atomic force microscopy were used to characterize the composite. The results showed that TCCA was successfully loaded on the surface of GO or intercalated among GO layers. Next, the antibacterial performance of the composite against Escherichia coli and Staphylococcus aureus was tested by the 96-well plate assay. A bactericidal kinetic curve, bacterial inhibition tests, and the mechanism of bacterial inhibition is discussed. The results showed that the minimum inhibitory concentration of the GO/TCCA composite (GO:TCCA ratio = 1:50) was 327.5 µg/mL against E. coli and 655 µg/mL against S. aureus. At the minimum inhibitory concentration, the inhibition rate of the GO/TCCA composite exceeded 99.46% against E. coli and 99.17% against S. aureus. The bactericidal kinetic curves indicate that the GO/TCCA composite has an excellent bactericidal effect against E. coli and S. aureus.

scholarly journals New Antimalarial and Antimicrobial Tryptamine Derivatives from the Marine Sponge Fascaplysinopsis reticulata

Marine Drugs ◽  
2019 ◽  
Vol 17 (3) ◽  
pp. 167 ◽  
Author(s):  
Pierre-Eric Campos ◽  
Emmanuel Pichon ◽  
Céline Moriou ◽  
Patricia Clerc ◽  
Rozenn Trépos ◽  
...  
Keyword(s):  
Plasmodium Falciparum ◽  
Minimum Inhibitory Concentration ◽  
Marine Sponge ◽  
Nmr Spectra ◽  
Inhibitory Concentration ◽  
Chemical Study ◽  
2D Nmr ◽  
Antimicrobial Activities ◽  
2D Nmr Spectra ◽  
Ic50 Values

Chemical study of the CH2Cl2-MeOH (1:1) extract of the sponge Fascaplysinopsis reticulata collected in Mayotte highlighted three new tryptophan derived alkaloids, 6,6′-bis-(debromo)-gelliusine F (1), 6-bromo-8,1′-dihydro-isoplysin A (2) and 5,6-dibromo-8,1′-dihydro-isoplysin A (3), along with the synthetically known 8-oxo-tryptamine (4) and the three known molecules from the same family, tryptamine (5), (E)-6-bromo-2′-demethyl-3′-N-methylaplysinopsin (6) and (Z)-6-bromo-2′-demethyl-3′-N-methylaplysinopsin (7). Their structures were elucidated by 1D and 2D NMR spectra and HRESIMS data. All compounds were evaluated for their antimicrobial and their antiplasmodial activities. Regarding antimicrobial activities, the best compounds are (2) and (3), with minimum inhibitory concentration (MIC) of 0.01 and 1 µg/mL, respectively, towards Vibrio natrigens, and (5), with MIC values of 1 µg/mL towards Vibrio carchariae. In addition the known 8-oxo-tryptamine (4) and the mixture of the (E)-6-bromo-2′-demethyl-3′-N-methylaplysinopsin (6) and (Z)-6-bromo-2′-demethyl-3′-N-methylaplysinopsin (7) showed moderate antiplasmodial activity against Plasmodium falciparum with IC50 values of 8.8 and 8.0 µg/mL, respectively.

scholarly journals Mono-/Bis-Alkenoic Acid Derivatives From an Endophytic Fungus Scopulariopsis candelabrum and Their Antifungal Activity

2022 ◽  
Vol 9 ◽  
Author(s):  
Jun Tang ◽  
Xueshuang Huang ◽  
Ming-Hang Cao ◽  
Zhiyan Wang ◽  
Zhiyin Yu ◽  
...  
Keyword(s):  
Candida Albicans ◽  
Minimum Inhibitory Concentration ◽  
Inhibitory Concentration ◽  
High Resolution Mass Spectrometry ◽  
2D Nmr ◽  
Positive Control ◽  
Diffusion Method ◽  
Exserohilum Turcicum ◽  
Chemical Structures ◽  
Alkenoic Acid

During a screening for antifungal secondary metabolites, six new mono-/bis-alkenoic acid derivatives (2–7) and one known alkenoic acid derivative (1) were isolated from an endophytic fungi Scopulariopsis candelabrum. Their chemical structures were identified by 1H-NMR, 13C-NMR, 2D NMR, and high-resolution mass spectrometry, as well as comparisons with previously reported literatures. Among them, fusariumesters C‒F (2–5) are bis-alkenoic acid derivatives dimerized by an ester bond, while acetylfusaridioic acid A (6) and fusaridioic acid D (7) are alkenoic acid monomers. All the isolates were submitted to an antifungal assay against Candida albicans and the corn pathogen Exserohilum turcicum using the filter paper agar diffusion method. As a result, only compound 1 decorating with β-lactone ring turned out to be active against these two tested fungi. The broth microdilution assay against Candida albicans showed the minimum inhibitory concentration (MIC) value of 1 to be 20 μg/ml, while the minimum inhibitory concentration value of the positive control (naystatin) was 10 μg/ml. And the half maximal inhibitory concentration (IC50) value (21.23 μg/ml) of 1 against Exserohilum turcicum was determined by analyzing its inhibition effect on the mycelial growth, using cycloheximide (IC50 = 46.70 μg/ml) as the positive control.

scholarly journals Efektivitas Fluoroquinolon Terhadap Isolat Bakteri Saluran Pencernaan Ular Sanca Batik (Python reticulatus)

2013 ◽  
Vol 1 (1) ◽  
pp. 27-31
Author(s):  
Agustina Dwi Wijayanti ◽  
Antasiswa Windraningtyas Rosetyadewi ◽  
Tri Untari
Keyword(s):  
Minimum Inhibitory Concentration ◽  
Inhibitory Concentration ◽  
Brilliant Green ◽  
Salmonella Spp ◽  
E Coli

Telah dilakukan penelitian tentang efektivitas antibiotika golongan fluoroquinolon (flumequin dan enrofloksasin) terhadap Salmonella dan E. coli yang diisolasi dari saluran pencernaan ular sanca batik (Python reticulatus). Penelitian ini bertujuan untuk mengetahui efektivitas fluoroquinolon terhadap infeksi saluran pencernaan pada ular dan reptil pada umumnya. Penelitian dilakukan dengan menggunakan 8 ekor sanca batik dewasa yang menderita gangguan pencernaan dengan lesi klinis berupa mouthrot. Sampel ulas kloaka dan mulut serta sampel darah diambil dari semua ular, untuk selanjutnya dilakukan uji mikrobiologis berupa isolasi dan identifikasi bakteri melalui media Brilliant Green Agar (BGA), Mc Conkay Agar (MCA), Triple Sugar Iron (TSI) dan media biakan murni. Isolat murni yang didapatkan adalah Salmonella spp. dan E. coli dan selanjutnya dilakukan uji sensitivitas bakteri terhadap flumequin dan enrofloksasin serta penentuan Minimum Inhibitory Concentration (MIC) untuk enrofloksasin. Hasilnya adalah kedua antibiotika efektif terhadap Salmonella dan intermediet terhadap E. coli. Nilai MIC enrofloksasin terhadap Salmonella adalah 2,5 μg/ml.

scholarly journals Secondary Metabolites from Leaves of Polyalthia lateriflora and Their Antimicrobial Activity

2020 ◽  
Vol 11 (3) ◽  
pp. 4353-4358
Author(s):  
Saripah Salbiah Syed Abdul Azziz ◽  
Ahmed Kareem Obaid Aldulaimi ◽  
Saadon Abdulla Aowda ◽  
Yuhanis Mhd Bakri ◽  
Ali Arkan Majhool ◽  
...  
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Antimicrobial Activity ◽  
Secondary Metabolites ◽  
Betulinic Acid ◽  
2D Nmr ◽  
Significant Inhibition ◽  
Spectroscopic Techniques ◽  
E Coli ◽  
Phytochemical Components ◽  
Antibacterial Potential

The study aimed to isolate and identify the phytochemical components of Polyalthia lateriflora leaves and evaluate the antimicrobial activity. Six well-known compounds, including three triterpene lupeol (1) betulinic acid (2), β-Sitosterol-β-D-glucoside (3) and three oxoaporphine alkaloids O-methylmoschotaline (4), liriodenine (5) and atherosperminine (6). Structural elucidation of compounds were established through spectroscopic techniques such as 1D and 2D NMR (1H and 13C, DEPT, COSY, NOESY, HMBC, HMQC), IR and LC-MS. The isolated compounds and crude extracted were tested for their antibacterial potential against several microorganisms including P. aeruginosa, E. coli, s, S. aureus, B. subtilis and Saccharomyces cerevisiae and its showed significant inhibition toward the organisms species with different concentration range.

Evaluation of Phytochemicals and Pharmacological Activities of Ben-Cha-Lo-Ka-Wi-Chian Remedy

2019 ◽  
Vol 891 ◽  
pp. 52-59
Author(s):  
Chanai Noysang ◽  
Teerarat Pummarin
Keyword(s):  
Antioxidant Activity ◽  
Minimum Inhibitory Concentration ◽  
Inhibitory Concentration ◽  
Propionibacterium Acnes ◽  
Ethanolic Extract ◽  
Inhibition Zone ◽  
Inhibitory Effect ◽  
Pharmacological Activities ◽  
Ethanolic Extracts ◽  
Reaction Test

Benchalokawichian (BLW) remedy is a Thai traditional medicine that has been notified in the List of Medicine Products of the National List of Essential Drugs A.D. 2006 and has long been used as an antipyretic. The phytochemicals of the 70% and 95% ethanolic extracts of were studied by color reaction test and HPTLC analysis. The BLW remedy showed a highest amounts of 70% ethanolic extractives (ca. 3.99 ± 0.60% of dry material weight). The several ethanolic extracts showed similar qualitative phytochemicals. The major of phytochemicals identified in these extracts were alkaloids, flavonoids, tannins, and polyphenols. The antioxidant activity was assessed using the 2,2-diphenyl-1-picrylhydrazyl assay. The analysed 70% ethanolic extract showed a highest antioxidant activity at IC50= 526.09 µg/ml and both extracts not showed tyrosinase inhibitory effect. The 95% ethanolic extract showed the greatest anti-propionibacterium acnes activity with inhibition zone of 10.10 ± 0.45 mm and minimum inhibitory concentration (MIC) was 5.05 mg/ml

scholarly journals Chemical Composition and Antifungal Activity of the Essential Oils of Schinus weinmannifolius Collected in the Spring and Winter

2014 ◽  
Vol 9 (9) ◽  
pp. 1934578X1400900
Author(s):  
Camila Hernandes ◽  
Silvia H. Taleb-Contini ◽  
Ana Carolina D. Bartolomeu ◽  
Bianca W. Bertoni ◽  
Suzelei C. França ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Chemical Composition ◽  
Minimum Inhibitory Concentration ◽  
Antifungal Activity ◽  
Essential Oil ◽  
Essential Oils ◽  
Inhibitory Concentration ◽  
Biological Activities ◽  
Antimicrobial Action ◽  
Pharmacological Profile

Reports on the chemical and pharmacological profile of the essential oil of Schinus weinmannifolius do not exist, although other Schinus species have been widely investigated for their biological activities. This work aimed to evaluate the chemical composition and antimicrobial activity of the essential oil of S. weinmannifolius collected in the spring and winter. The essential oils were extracted by hydrodistillation, analyzed by GC/MS and submitted to microdilution tests, to determine the minimum inhibitory concentration. The oils displayed different chemical composition and antimicrobial action. Bicyclogermacrene and limonene predominated in the oils extracted in the winter and spring, respectively, whereas only the latter oil exhibited antifungal activity.

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