scholarly journals Paralemnolins X and Y, New Antimicrobial Sesquiterpenoids from the Soft Coral Paralemnalia thyrsoide

Antibiotics ◽  
2021 ◽  
Vol 10 (10) ◽  
pp. 1158
Author(s):  
Abdelsamed I. Elshamy ◽  
Tarik A. Mohamed ◽  
Eman M. Elkady ◽  
Ibrahim A. Saleh ◽  
Ahmed A. El-Beih ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Candida Albicans ◽  
Aspergillus Niger ◽  
Spectroscopic Data ◽  
Soft Coral ◽  
2D Nmr ◽  
Organic Extracts

The organic extracts of the Red Sea soft coral Paralemnalia thyrsoides has led to the identification of two neolemnane-type sesquiterpenoids: paralemnolins X and Y (1, 2). In addition to these newly characterized compounds, ten known metabolites (3–12) were isolated. Previously reported compounds were elucidated by literature comparison of spectroscopic data (1D and 2D NMR as well as MS data). In vitro antimicrobial activity was investigated for compounds (1–12) against Staphylococcus aureus, Escherichia coli, Candida albicans and Aspergillus niger. Compound 5 showed antimicrobial activity against all assayed microorganisms.

scholarly journals Evaluation du potentiel antimicrobien et de la toxicité des extraits de Jatropha multifida Linn, (Euphorbiaceae)

2020 ◽  
Vol 151 ◽  
pp. 15550-15558
Author(s):  
Amégninou Agban ◽  
Yao Hoekou ◽  
Passimna Pissang ◽  
Tchadjobo Tchacondo ◽  
Komlan Batawila
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Candida Albicans ◽  
Aqueous Extract ◽  
E Coli ◽  
Toxicological Studies ◽  
Jatropha Multifida

Objectif : L’objectif de ce travail était d’évaluer in vitro l’activité antimicrobienne des extraits de feuilles et tige de Jatropha multifida sur la croissance de Candida albicans, Escherichia coli et Staphylococcus aureus, puis d’évaluer in vivo la toxicité de cette plante. Méthodologie et résultats : Les méthodes de diffusion en milieu gélosé et de microdilution en milieu liquide ont été utilisées pour évaluer l’effet antimicrobien. Une étude en subaigüe était réalisée afin d’explorer les effets toxiques de l’extrait aqueux des feuilles. Les résultats des tests antimicrobiens montrent une activité des extraits de feuilles et tige de J. multifida sur la croissance des souches utilisées avec des diamètres de zones d’inhibition allant de 8 à 25 mm et des concentrations minimales inhibitrices (CMI) variant de 0,039 mg/mL à 1,25 mg/mL à l’exception des souches de E. coli qui sont résistantes aux extraits de la tige. L’administration en subaigüe de l’extrait aqueux des feuilles de J. multifida à la dose de 600 mg/kg entraîne une perte significative de poids chez les souris. Conclusion et applications des résultats : Les extraits aqueux, éthanolique et hydroéthanolique des feuilles et tige de J. multifida possèdent d’activité antimicrobienne et pourraient être utilisés dans le traitement des Candidoses à C. albicans et des infections à S. aureus. Mais l’essai de toxicité subaigüe montre que l’extrait aqueux de la plante serait toxique. Des études toxicologiques approfondies restent donc nécessaires sur ces extraits afin de mieux élucider leur inocuité. Mots-clés : Jatropha multifida, extraits de feuilles et de tige, activités antifongique et antibactérienne, toxicité. Agban et al., J. Appl. Biosci. 2020 Evaluation du potentiel antimicrobien et de la toxicité des extraits de Jatropha multifida Linn, (Euphorbiaceae) 15551 Evaluation of antimicrobial potential and toxicity of Jatropha multifida Linn, (Euphorbiaceae) extracts ABSTRACT Objective: The objective of this study was to evaluate in vitro the antimicrobial activity of leaves and stem of Jatropha multifida extracts against Candida albicans, Escherichia coli and Staphylococcus aureus, and then to evaluate in vivo the toxicity of this plant. Methodology and Results: The agar well-diffusion and the NCCLS broth microdilution methods were used to assess the antimicrobial effect. A subacute study was carried out to explore the toxic effects of the aqueous extract of the leaves. The results of the antimicrobial tests show an activity of the extracts of leaves and stems of J. multifida on the growth of the strains used with diameters of inhibitory zones ranging from 8 to 25 mm and minimum inhibitory concentrations (MIC) varying from 0.039 mg/mL to 1.25 mg/mL exception E. coli strains which are resistant to extracts from the stem. Subacute administration of the aqueous extract of the leaves of J. multifida at a dose of 600 mg/kg leads to a significant loss of weight in the mice. Conclusion and application of findings : The aqueous, ethanolic and hydroethanolic extracts of the leaves and stem of J. multifida have antimicrobial activity and could be used in the treatment of Candidiasis and bacterial infections due respectively to C. albicans and S. aureus. But the subacute toxicity test shows that the aqueous extract of the plant would be toxic. Extensive toxicological studies therefore remain necessary on these extracts in order to better elucidate their safety. Keywords: Jatropha multifida extracts of leaves and stem, antifungal and antibacterial activities, toxicity

scholarly journals Antimicrobial activity of bioactive component from flower of linum capitatum kit

2004 ◽  
Vol 3 (1) ◽  
pp. 73-77 ◽  
Author(s):  
Slavica Ilic ◽  
Sandra Konstantinovic ◽  
Zoran Todorovic
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Antimicrobial Activity ◽  
Candida Albicans ◽  
Aspergillus Niger ◽  
Bioactive Components ◽  
Bioactive Component ◽  
Bacillus Subtilus ◽  
Simplex Virus

Different extracts containing bioactive components and etheric oil of the flowers of Linum capitation kit. (Linacea) of Serbian origin were tested for an Antimicrobial activity against four bacteria (Staphylococcus aureus Escherichia coli, Bacillus subtilus, Pseudomonas aeruginosa), one mold (Aspergillus niger) and one yeast (Candida albicans). The isolated Flavonoids were also tested against Staphylococcus aureus, Escherichia coli Bacillus anhtracis, Pseudomonas aeruginosa, Aspergillus niger, Candida albicans and Herpes simplex virus type.

Synthesis of Some Novel Quinolinols with In-vitro Antimicrobial, and Antioxidant Activity

2020 ◽  
Vol 16 (4) ◽  
pp. 514-520
Author(s):  
Marwa A. Sh. Shehab ◽  
Mohamed El-Naggar ◽  
Rabab A. Ismail ◽  
Hala M. El Kafrawy ◽  
Amira Abood ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antioxidant Activity ◽  
Candida Albicans ◽  
Aspergillus Niger ◽  
Mannich Bases ◽  
Klebsiella Pneumonia ◽  
Good Activity ◽  
Penicillium Sp

Background: Amongst the quinolone core structures, 8-hydroxyquinoline (8-HQ or quinolinol) stands out as the greatest frequently used therapeutic moietiy. This includes the most critical molecules in medicinal chemistry. Quinolinol remains a broad-spectrum ligand capable of chelating to a large number of metal ions. Methods: The synthesized quinolinols Mannich bases were screened for their in vitro antimicrobial activity against Staphylococcus aureus (ATTCC 6538), Escherichia coli (ATTCC 7839), Klebsiella pneumonia (ATCC10131). The antifungal activity of the prepared compounds was assessed against Candida albicans (10231), Aspergillus niger and Penicillium sp. The antioxidant activity of the established compounds was assessed by means of α, α-diphenyl-β-picrylhydrazyl (DPPH) free radical scavenging method. Results: The antimicrobial outcomes indicated that all the synthesized compounds excluding 5 and 9b displayed reasonable antibacterial activity against Staphylococcus aureus (ATTCC 6538) and Escherichia coli (ATTCC 7839) with an inhibition zones ranging from 13 to 23 mm. However, in the case of Klebsiella pneumonia (ATCC10131) only compound 6 did not show any activity. The results also indicated that compounds 2b and 3 were the most potent antibacterial compounds against the verified strains with minimum inhibitory concentration (MIC) values ranging from 0.05 to 0.5mg/ml. In the antifungal assay, all compounds showed good activity against Candida albicans (10231) except compounds 5 and 9b. However, in the case of Aspergillus niger and Penicillium sp. only compounds 2b and 3 showed good activity. In the antifungal assay, MIC values for compounds 2b and 3 ranged from 0.25 to 2.5 mg/ml against the specified fungal strains. The antioxidant activity was assessed using the DPPH scavenging activity method. The results indicated that 2b was the most active among all tested compounds, with almost double the antioxidant activity as compared with that of trolox (positive control). Conclusion: In this work, we describe the synthesis of new Mannich bases comprising 8-HQ (1) and its derivative (8). The resulted Mannich bases of type 2 were used in transamination reactions with hydrazine and hydrazine derivatives. The structures of the newly synthesized Mannich bases were confirmed based on the NMR spectroscopic data and elemental analysis. Antimicrobial and antioxidant activities were also assessed.

scholarly journals In-vitro antimicrobial activity of methanolic and aqueous leaf extracts of Chrysophyllum albidum (African star apple) and Garcinia kola (Bitter kola)

2021 ◽  
Vol 14 (03) ◽  
pp. 249-253
Author(s):  
Nicholas Chinedu Ewelike ◽  
Joy Chinyere Okammadu ◽  
Vincent Ezechukwu Ogwudire ◽  
Raymond Ikechukwu Nnadozie
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Candida Albicans ◽  
Klebsiella Pneumonia ◽  
Leaf Extracts ◽  
Garcinia Kola ◽  
Test Organisms ◽  
African Star Apple

Methanolic and aqueous leaf extracts of Chrysophyllum albidum (African star apple) and Garcinia kola (bitter kola) were studied for in-vitro microbial activity using the disc diffusion technique. The aqueous and methanolic leaf extracts of Chrysophyllum albidum showed antimicrobial activity against Escherichia coli, Staphylococcus aureus and Candida albicans but showed no antibacterial activity against Klebsiella pneumonia. The methanolic leaf extract of Garcinia kola inhibited the growth of Escherichia coli, Staphylococcus aureus and Klebsiella pneumonia while the aqueous extract of the leaf inhibited the growth of Staphylococcus aureus and Escherichia coli. Both methanolic and aqueous leaf extracts of the plant showed no antifungal activity against Candida albicans. The minimum inhibitory concentrations of the leaf extracts of Chrysophyllum albidum ranged from 12.5 mgL-1 to 25 mgL-1 while those of Garcinia kola ranged from 25 mgL-1 to 50 mgL-1. The results obtained suggest that the leaves of these plants can be used in treating diseases caused by the test organisms. The further investigation on the crude extracts would characterize bioactive components of the leaves of Chrysophyllum albidum and Garcinia kola.

scholarly journals Copper(II) complexes of substituted salicylaldimines with benzimidazole nucleus: synthesis, characterization and antimicrobial activity

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Abdullahi Sobola ◽  
Gary Watkins
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Schiff Base ◽  
Candida Albicans ◽  
Molar Conductivity ◽  
Conductivity Data ◽  
Low Activity ◽  
Broth Dilution

The aim of this study was to synthesize and evaluate the antimicrobial activity of Cu(II) complexes of some substituted salicylaldimines with benzimidazole nucleus. The salicylaldimine ligands were prepared by condensing 2-aminobenzimidazole with salicylaldehyde, o-vanillin and p-vanillin. All the compounds and the Cu(II) complexes were characterized by elemental , electronic, infrared and molar conductivity data. In addition, the structures of the ligands were confirmed with 1H-NMR and 13C-NMR spectral data. Both the ligands and the Cu(II) complexes have been screened for their in vitro antimicrobial activity against Staphylococcus aureus subsp. aureus ATCC® 6538™, Bacillus substillis subsp. spizizenii ATCC® 6633™*, Escherichia coli ATCC® 8739™* and Candida albicans ATCC® 2091™* using agar diffusion and broth dilution techniques. The ligands coordinated to the Cu(II) ion in a 1:2 (M:L) ratio as tridentate monobasic species via the imine-N, the imidazole-N and the phenolic–O to give six-coordinated Cu(II) complexes. The free ligands exhibited varying antimicrobial activity on the tested organisms from low activity to significant potency. Candida albicans was specifically susceptible to the o-vanillin Schiff base ligand. The presence of Cu(II) ion, however, did not have a regular effect on the activity of the compounds.

scholarly journals UJI AKTIVITAS ANTIMIKROBA KARANG LUNAK Dendronephtya sp., YANG DIKOLEKSI DARI DESA TUMBAK KECAMATAN PUSOMAEN, KABUPATEN MINAHASA TENGGARA TERHADAP Escherichia coli, Staphylococcus aureus, dan Candida albicans

PHARMACON ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 63
Author(s):  
Gloria Ekaputri Silap ◽  
Defny Wewengkang ◽  
Henki Rotinsulu
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Candida Albicans ◽  
Soft Coral ◽  
Ethanol Extract ◽  
Diffusion Method ◽  
Solvent Fractionation ◽  
Escherichia Coli Bacteria ◽  
Partition Method

ABSTRACTSoft coral Dendronephtya sp., living in the waters of coral reefs that are rather deep, at depths below 10 meters, grow attached to a hard substrate, protected under lumps of living coral or dead coral. This study aims to determine the antimicrobial activity of soft coral Dendronephtya sp., collected from the waters of Tumbak Village, Pusomaen District, Southeast Minahasa Regency, against Escherichia coli, Staphylococcus aureus and Candida albicans. Dendronephtya sp., extracted by maceration method using 96% ethanol solvent, fractionation using liquid-liquid partition method with n-hexane, chloroform and methanol solvent, and the testing of antimicrobial activity using the Kirby Bauer diffusion method. The results showed that ethanol extract of soft corals (Dendronephtya sp.), n-hexane fraction had inhibition of 8 mm against Escherichia coli bacteria, 7 mm against Staphylococcus aureus while Candida albicans had very good activity in n-hexane fractions of n-hexane. 9.3 mm, so it can be recommended as an antimicrobial. Keywords : Antimicrobial, Candida albicans, Escherichia coli, Soft Coral (Dendronephtya sp.), Staphylococcus aureus. ABSTRAKKarang lunak Dendronephtya sp., hidup di perairan terumbu karang yang agak dalam, pada kedalaman di bawah 10 meter, tumbuh melekat di dasar yang keras, terlindung di bawah bongkahan karang hidup atau karang mati. Penelitian ini bertujuan untuk mengetahui adanya aktivitas antimikroba dari karang lunak Dendronephtya sp., yang dikoleksi dari perairan Desa Tumbak Kecamatan Pusomaen Kabupaten Minahasa Tenggara terhadap Escherichia coli, Staphylococcus aureus dan Candida albicans. Dendronephtya sp., diekstraksi dengan metode maserasi menggunakan pelarut etanol 96%, fraksinasi menggunakan metode partisi cair-cair dengan pelarut n-heksan, kloroform dan metanol, dan pengujian aktivitas antimikroba menggunakan metode difusi agar Kirby Bauer. Hasil penelitian menunjukkan bahwa ekstrak etanol karang lunak (Dendronephtya sp.) Fraksi karang n-heksan memiliki daya hambat sebesar 8 mm  terhadap bakteri Escherichia coli, 7 mm pada Staphylococcus aureus  sedangkan  Candida albicans aktivitas  yang sangat baik terjadi pada fraksi dan ekstrak n-heksan sebesar 9,3 mm, sehingga dapat direkomendasikan sebagai antimikroba. Kata Kunci : Antimikroba, Candida albicans, Escherichia coli,  Karang Lunak (Dendronephtya sp.), dan Staphylococcus aureus

scholarly journals Actividad antimicrobiana de cuatro plantas del nor-oriente peruano

2009 ◽  
Vol 12 (1) ◽  
pp. 41-47 ◽  
Author(s):  
Julio R. Ruiz Q. ◽  
Mirtha Roque A.
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Bacillus Subtilis ◽  
Candida Albicans ◽  
Aspergillus Niger ◽  
Staphylococcus Epidermidis ◽  
Microsporum Canis ◽  
Terminalia Catappa

Se investigó la actividad antimicrobiana in vitro de los extractos metanólicos, etanólicos e hidroalcohólicos de cuatro plantas del nor-oriente peruano: Cassia reticulata (planta entera), Ilex guayusa Loes (hojas), Piper lineatum (hojas), y Terminalia catappa (hojas). Las especies fueron recolectadas en el departamento de Cajamarca, excepto Terminalia catappa (Amazonas). La actividad antimicrobiana se evaluó mediante el método de difusión en agar. Los microorganismos utilizados fueron las bacterias Staphylococcus aureus, Staphylococcus epidermidis, Pseudomonas aeruginosa, Bacillus subtilis y Escherichia coli; y los hongos Candida albicans, Aspergillus niger y Microsporum canis. De doce extractos investigados, ocho (67%) presentaron actividad antimicrobiana significativa frente a Staphylococcus aureus y Staphylococcus epidermidis y uno (8%) frente a Escherichia coli. De doce extractos investigados, diez (83%) presentaron actividad significativa frente a Candida albicans, y seis (50%) contra Microsporum canis. Los extractos con la mejor actividad actimicrobiana fueron los tres extractos del Piper lineatum; el extracto hidroalcohólico de Cassia reticulata y el hidroalcohólico de Terminalia catappa.

scholarly journals Pericocins A–D, New Bioactive Compounds from Periconia sp

2015 ◽  
Vol 10 (12) ◽  
pp. 1934578X1501001
Author(s):  
Yue-Hua Wu ◽  
Gao-Keng Xiao ◽  
Guo-Dong Chen ◽  
Chuan-Xi Wang ◽  
Dan Hu ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Candida Albicans ◽  
Aspergillus Niger ◽  
Biosynthetic Pathway ◽  
Propanoic Acid ◽  
Spectroscopic Methods ◽  
Weak Activity ◽  
Endolichenic Fungus

One new dihydroisocoumarin, pericocin A (1), one new chromone, pericocin B (2), and two new α-pyrone derivatives, pericocins C-D (3–4), together with two known compounds, 3-(2-oxo-2 H-pyran-6-yl)propanoic acid (5) and ( E)-3-(2-oxo-2 H-pyran-6-yl)acrylic acid (6), were isolated from the culture of the endolichenic fungus Periconia sp.. Their structures were elucidated by spectroscopic methods. All these compounds are derived from the polyketone biosynthetic pathway. Compound 1 was obtained as a mixture of enantiomers. The antimicrobial activity of compounds 1–5 was tested against Escherichia coli, Staphylococcus aureus, Aspergillus niger, and Candida albicans. Compounds 1–5 showed moderate antimicrobial activity against A niger and weak activity against C. albicans.

Two Epimeric Flavalignans from Trichilia catigua (Meliaceae) with Antimicrobial Activity

2002 ◽  
Vol 57 (5-6) ◽  
pp. 483-488 ◽  
Author(s):  
Moacir G. Pizzolatti ◽  
Andreia F. Venson ◽  
Artur Smânia Júnior ◽  
Elza de F. A. Smânia ◽  
Raimundo Braz-Filho
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Antimicrobial Activity ◽  
Antibacterial Activity ◽  
Natural Products ◽  
Bacillus Cereus ◽  
Spectroscopic Data ◽  
2D Nmr ◽  
And Staphylococcus Aureus

A mixture of flavalignan cinchonains Ia and Ib was isolated from the bark of Trichilia catigua. The structures were established on the basis of spectroscopic data of the natural products and their methylated derivatives including 2D NMR experiments, and compared with data in the literature. These flavalignans exhibited antibacterial activity against Bacillus cereus, Escherichia coli, Pseudomonas aeruginosa and Staphylococcus aureus.

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