scholarly journals Synthesis, Characterization, and Antibacterial Evaluation of Heteroleptic Oxytetracycline-Salicylaldehyde Complexes

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Rohit Kumar Dev ◽  
Parashuram Mishra ◽  
Narendra Kumar Chaudhary ◽  
Ajaya Bhattarai
Keyword(s):  
Electronic Absorption ◽  
Spectral Methods ◽  
Geometry Optimization ◽  
Alcoholic Solution ◽  
Diffusion Method ◽  
Tetrahedral Geometry ◽  
Thermal Stabilities ◽  
Growth Inhibitory ◽  
Mm2 Calculations ◽  
Thermal Analysis Techniques

A new series of mixed ligand complexes of Cd(II) and Mo(V) were successfully synthesized by refluxing the mixture solution of oxytetracycline hydrochloride (OTC.HCl) with an aqueous and alcoholic solution of metal (M = Cd(II) and Mo(V)) salts and an alcoholic solution of salicylaldehyde (Sal). The complexes were characterized by modern analytical and spectral methods such as elemental microanalysis, pH, conductivity, surface tension, viscosity, melting point, and spectral methods such as FT-IR, NMR, electronic absorption, SEM, and mass spectrometry. Conductivity measurements of the complexes revealed their electrolytic nature. The kinetic and thermal stabilities were investigated using thermogravimetric and differential thermal analysis techniques. Thermodynamic and kinetic parameters such as E∗, ΔH∗, ΔS∗, and ΔG∗ were calculated from TG curves using the Coats–Redfern method. Geometry optimization of the proposed structure of the complexes was achieved by running MM2 calculations in a Gaussian-supported CS ChemOffice 3D Pro.12.0 version software. The final optimized geometrical energies for respective Cd-OTC/Sal and Mo-OTC/Sal complexes were found to be 923.1740 and 899.3184 kcal/mol. The electronic absorption spectral study revealed a tetrahedral geometry for the Cd-OTC/Sal complex and octahedral geometry for the Mo-OTC/Sal complex. The antibacterial sensitivity of the complexes was evaluated against three bacterial pathogens such as S. aureus, E. coli, and P. mirabilis using the modified Kirby–Bauer paper disc diffusion method. The antibacterial study revealed significant growth inhibitory action of the complexes.

scholarly journals Computational and Spectral Discussion of Some Substituted Chalcone Derivatives

2021 ◽  
Vol 12 (6) ◽  
pp. 7159-7176
Keyword(s):  
Geometry Optimization ◽  
Spectroscopic Characterization ◽  
Diffusion Method ◽  
Geometrical Parameters ◽  
1H And 13C Nmr ◽  
Chalcone Derivatives ◽  
Ft Ir ◽  
Experimental Values ◽  
Antibacterial And Antifungal ◽  
Homo Lumo

The substituted chalcone derivatives 1–7 have been synthesized, and spectroscopic characterization were done as done using the experimental FT-IR, UV-Vis, GC-MS, 1D NMR spectroscopy. The favored conformation of substituted chalcone 3 was predicted theoretically by geometry optimization structure selected geometrical parameters and molecular properties such as NBO, AIM, HOMO-LUMO, MEP surface, and atomic charges were derived from optimized structures. The 1H and 13C NMR spectral data had been additionally computed using the Gaussian-09 package and compared with the experimental values. The antibacterial and antifungal activity was derived by the disc diffusion method.

Two new zinc(II) and mercury(II) complexes based on N,N′-(cyclohexane-1,2-diylidene)bis(4-fluorobenzohydrazide): synthesis, crystal structures and antibacterial activities

2020 ◽  
Vol 76 (5) ◽  
pp. 476-482
Author(s):  
Al-Ameen Bariz OmarAli ◽  
Ahmed Jasim M. Al-Karawi ◽  
Adil A. Awad ◽  
Necmi Dege ◽  
Sevgi Kansız ◽  
...  
Keyword(s):  
Organic Ligand ◽  
Antibacterial Activities ◽  
Structural Features ◽  
Bacterial Strains ◽  
Tetrahedral Geometry ◽  
X Ray ◽  
X Ray Crystallography ◽  
Growth Inhibitory ◽  
The Difference

Reaction of N,N′-(cyclohexane-1,2-diylidene)bis(4-fluorobenzohydrazide), C20H18F2N4O2, (LF ), with zinc chloride and mercury(II) chloride produced different types and shapes of neutral coordination complexes, namely, dichlorido[N,N′-(cyclohexane-1,2-diylidene)bis(4-fluorobenzohydrazide)-κ2 N,O]zinc(II), [ZnCl2(C20H18F2N4O2)], (1), and dichlorido[N,N′-(cyclohexane-1,2-diylidene)bis(4-fluorobenzohydrazide)-κ4 O,N,N′,O′]mercury(II), [HgCl2(C20H18F2N4O2)], (2). The organic ligand and its metal complexes are characterized using various techniques: IR, UV–Vis and nuclear magnetic resonance (NMR) spectroscopies, in addition to powder X-ray diffraction (PXRD), single-crystal X-ray crystallography and microelemental analysis. Depending upon the data from these analyses and measurements, a typical tetrahedral geometry was confirmed for zinc complex (1), in which the ZnII atom is located outside the bis(benzhydrazone) core. The HgII atom in (2) is found within the core and has a common octahedral structure. The in vitro antibacterial activities of the prepared compounds were evaluated against two different bacterial strains, i.e. gram positive Bacillus subtilis and gram negative Pseudomonas aeruginosa bacteria. The prepared compounds exhibited differentiated growth-inhibitory activities against these two bacterial strains based on the difference in their lipophilic nature and structural features.

scholarly journals UJI AKTIVITAS ANTIBAKTERI EKSTRAK DAUN TEMBELEKAN (Lantana camara Linn) TERHADAP PERTUMBUHAN Staphylococcus aureus dan Escherichia coli

Biocelebes ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 90-97
Author(s):  
Gaby Maulida Nurdin
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antibacterial Activity ◽  
Ethanol Extract ◽  
Lantana Camara ◽  
Diffusion Method ◽  
E Coli ◽  
Activity Test ◽  
Growth Inhibitory ◽  
One Way Anova

This study aimed to determine the effect of concentration ethanol extract from tembelakan leaf (Lantana camara Linn)  on bacteria growth of Staphylococcus aureus and Escherichia coli. Extraction was done by maceration using ethanol 96% and then separated using rotary evaporator. Antibacterial activity test of the ethanol extract by Well agar diffusion method. Variation in crude extract saponin used in this study was 5%, 10%, 15%, 20%, 25% and positive controls were used for comparison with Amoxicilin and Chloramphenicole concentration of 25 µg/mL and DMSO as a negative control. The results of antibacterial activity test is indicated by the formation of growth inhibitory region S. aureus and E. coli. The result of growth inhibitory regions was analyzed by One way ANOVA. One way ANOVA test results indicate that there are effects of ethanol extract concentration of tembelekan leaf (L. camara Linn) against S. aureus and E. coli. Effective concentration of ethanol extract tembelekan leaf (L. camara Linn) when compared with positive control to inhibit the growth of S. aureus and E. coli is at 25% with a relatively strong antibacterial activity. Test with phytochemicals screening method which is showed that tembelekan leaf contains the flavanoid, saponins, and tannins compounds as antibacterial

scholarly journals Antibacterial Effects of Honey in Nigeria on Selected Diarrhoeagenic Bacteria

2019 ◽  
pp. 1-11 ◽  
Author(s):  
Justinah F. John-Isa ◽  
Tinuola T. Adebolu ◽  
Victor O. Oyetayo
Keyword(s):  
Antibacterial Activity ◽  
Shigella Dysenteriae ◽  
Diffusion Method ◽  
Antibacterial Effects ◽  
University Of Technology ◽  
Growth Inhibitory ◽  
Growth Inhibitory Activity ◽  
Ondo State ◽  
Conventional Antibiotics ◽  
And Staphylococcus Aureus

Aims: This study is geared to evaluating honey as an alternative of conventional antibiotics to treat infections caused by the selected diarrhoeagenic bacteria. Place and duration of Study: Research laboratory of Federal University of Technology Akure (FUTA), Ondo State, Nigeria between December 2017 to May 2018.  Methodology: Honey samples from ten (10) different locations in Nigeria were screened for possible antibacterial activity on both the clinical and typed cultures of the selected diarrhoeagenic bacteria; Escherichia coli, Salmonella typhimurium, Shigella dysenteriae, Bacillus cereus and Staphylococcus aureus using agar well diffusion method. Conventional antibiotics were used as control. Data obtained were subjected to one way analysis of variance (ANOVA) using XL-Start, 2016 version. Results: All the honey samples used exerted growth inhibitory activity on all the test bacteria including the ones that were resistant to the conventional antibiotics (Ofloxacin and augmentin) used as control. In some cases, the growth inhibitions mediated by the honey samples were superior to that of the conventional antibiotics. Conclusion: This study showed that honey has antibacterial activity against the selected bacteria and therefore can be exploited as an alternative to conventional antibiotics to treat infections caused by the selected diarrhoeagenic bacteria especially the ones that were resistant to conventional antibiotics.

Growth Inhibitory Properties of Synthetic Chalcones

2020 ◽  
Vol 16 (6) ◽  
pp. 892-899
Author(s):  
Gajanan D. Kottapalle ◽  
Nagesh J. Deshmukh ◽  
Avinash T. Shinde
Keyword(s):  
Antibacterial Activity ◽  
Condensation Reaction ◽  
Aromatic Aldehydes ◽  
Hydroxyl Group ◽  
Diffusion Method ◽  
Bacillus Species ◽  
Interesting Insight ◽  
Growth Inhibitory ◽  
Free Hydroxyl ◽  
Target Molecules

Background: In the present study, chalcones were synthesized from 2-hydroxy-1- acetonaphthone and substituted aromatic aldehydes were synthesized by Claisen Schmidt condensation reaction using potassium hydroxide as a base. The synthesized chalcones were purified by recrystallization from ethanol and evaluated for antibacterial activity by well diffusion method. The antibacterial activity was evaluated against Bacillus licheniformis, Bacillus species, Escherichia coli and Staphylococcus aureus using Ciprofloxacin as a standard. Methods: The target molecules were prepared by reacting 2-hydroxy-1-acetonaphthone and various substituted aromatic aldehyde in the presence of suitable condensing agents. The structure of synthesized compounds was confirmed on the basis of elemental analysis, IR, 1H NMR and 13C NMR spectral data. These synthesized compounds were also screened for antibacterial activity. Results: In the present study, free hydroxyl group in position 2 or 4 of aldehyde ring of synthesized chalcones appears to be a very important requirement in increasing the activity (2-5 and 8-13). When the hydroxyl group in position 4 is alkylated (14, 15), the chalcones become less active. When more complex substituent is present on the aldehyde ring (6, 7) there is a decrease in the activity. Conclusion: Newly synthesized chalcones (1-15) show good and moderate antibacterial activity. We believe that the new hydroxy substituted (in aldehyde ring) chalcones (2-5 and 8-13) reported in this work may provide an interesting insight for further optimization.

scholarly journals Synthesis, Thermal Characterization and in vitro Antibacterial Assessment of Co(II) and Cd(II) Complexes of Schiff Base Derived from Amoxicillin and Thiophene-2-carbaldehyde

2019 ◽  
Vol 31 (4) ◽  
pp. 951-959 ◽  
Author(s):  
N.K. Chaudhary ◽  
B. Guragain
Keyword(s):  
Metal Complexes ◽  
Biological Activities ◽  
Geometry Optimization ◽  
Thermal Characterization ◽  
Molar Conductance ◽  
Sem Analysis ◽  
Biological Data ◽  
Spectral Studies ◽  
Tetrahedral Geometry

A novel AMXTC2 ligand was prepared by simultaneous stirring and refluxing of an equimolar mixture of amoxicillin and thiophene-2-carbaldehyde in methanol and was further used to synthesize metal complexes by metalation with cobalt and cadmium salts, taking ligand metal ratio 2:1. They were characterized by elemental microanalysis, FT-IR, mass, UV-visible, 1H NMR, thermal analysis, magnetic moment and molar conductance measurements. The coordination sites in the ligand were verified by their comparative and extensive spectral studies. The detailed exploration of the data suggested octahedral geometry for Co-AMXTC2 and tetrahedral geometry for Cd-AMXTC2 complexes. The thermodynamic and kinetic parameters such as E*, ΔH*, ΔS* and ΔG* of various decomposition steps were calculated from TGA curves using the Coats-Redfern method. The molar conductivity data suggested non-electrolytic nature of the complexes. SEM analysis was done to observe their surface morphology. The geometry optimization of the proposed molecular structure of the complexes was achieved by running MM2 calculation in Gaussian supported Cs-ChemOffice Ultra-11 program software. The biological activities had been evaluated in vitro against E. coli, K. pneumonia, P. vulgaris and S. aureus pathogens in order to assess their antibacterial potency. The biological data revealed better growth inhibitory action of the ligand and metal complexes with bacterial pathogens.

scholarly journals In-vitro antimicrobial activity of ethyl acetate extract of two common edible mushrooms

2016 ◽  
Vol 5 (2) ◽  
pp. 79-82
Author(s):  
Debendra Nath Roy ◽  
◽  
A. K. Azad ◽  
Farzana Sultana ◽  
A.S.M. Anisuzzaman ◽  
...  
Keyword(s):  
Ethyl Acetate ◽  
Pleurotus Ostreatus ◽  
Ganoderma Lucidum ◽  
Ethyl Acetate Extract ◽  
Diffusion Method ◽  
Standard Drug ◽  
Gram Positive Bacteria ◽  
Growth Inhibitory ◽  
Growth Inhibitory Activity

Ethyl acetate extracts of the reishi (Ganoderma lucidum) and oyster (Pleurotus ostreatus) mushrooms were tested for their in vitro growth inhibitory activity against a panel of microorganisms of reference strains. Antimicrobial effects of both mushrooms were monitored in the dose of 400 micro gm /disc by disc diffusion method using five Gram-positive bacteria, five Gram-negative bacteria and three fungi as well. Present study showed that ethyl acetate extract of Pleurotus ostreatus has moderate and Ganoderma lucidum has only mild antibacterial effect in comparison with standard Kanamycin (30 gm. /disc). However, both mushrooms had no antifungal activity on the experimental fungi compared with standard drug Nystatin at the dose of 30 gm. /disc.

AKTIVITAS PENGHAMBATAN PERTUMBUHAN MIKROORGANISME DARI EKSTRAK DAN FRAKSI ALGA Ulva lactuca TERHADAP Escherichia coli, Staphylococcus aureus, DAN Candida albicans

PHARMACON ◽  
2019 ◽  
Vol 8 (2) ◽  
pp. 397
Author(s):  
Brigieta Keintjem ◽  
Defny S. Wewengkang ◽  
Fatimawali Fatimawali
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Candida Albicans ◽  
Ulva Lactuca ◽  
Diffusion Method ◽  
Bioactive Substances ◽  
Growth Inhibitory ◽  
Growth Inhibitory Activity ◽  
Temperature Water

ABSTRACT Algae have long been used for the treatment of various types of diseases. Ulva lactuca is one of the algae, which contains bioactive substances as antimicrobial, antifungal, and antioxidant. This study aims to determine the microorganisms growth inhibitory activity from Ulva lactuca algae obtained from the of Lembeh Strait waters in City of Bitung against microorganisms Escherichia coli, Staphylococcus aureus and Candida albicans. Ulva lactuca algae was extracted using maceration method with ethanol solvent and fractionated with methanol, n-hexan and chloroform solvents. Testing of antimicrobial activity using agar diffusion method. The result showed that extracts and fractions of Ulva lactuca algae did not have antimicrobial activity against the microorganisms Escherichia coli, Staphylococcus aureus and Candida albicans. The chemical composition of algae is influenced by season, geographical distribution, as well as environmental factors such as temperature, water, salinity, light, nutrition, and mineral availability.Keywords: Ulva lactuca, Antimicrobials, Maseration, Fractions, Agar DiffusionABSTRAK Alga telah lama digunakan untuk keperluan pengobatan berbagai jenis penyakit.  Ulva lactuca merupakan salah satu alga yang memiliki kandungan zat bioaktif sebagai antimikroba. Penelitian ini bertujuan untuk mengetahui adanya aktivitas penghambat pertumbuhan mikroorganisme dari alga Ulva lactuca yang diperoleh dari perairan Selat Lembeh kota Bitung terhadap mikroba Escherichia coli, Staphylococcus aureus, dan Candida albicans. Alga Ulva lactuca diekstraksi menggunakan metode maserasi dengan pelarut etanol dan difraksinasi dengan pelarut methanol, n-hexan, dan kloroform. Pengujian aktivitas antimikroba menggunakan metode difusi agar. Hasil penelitian menunjukkan ekstrak dan fraksi dari alga Ulva lactuca tidak memiliki aktivitas antimikroba terhadap Escherichia coli, Staphylococcus aureus, dan Candida albicans. Komposisi kimia alga dipengaruhi oleh musim, distribusi geografis, serta faktor lingkungan seperti suhu, air, salinitasi, cahaya, nutrisi, dan ketersediaan mineral.Kata kunci : Alga Ulva lactuca, Antimikroba, Maserasi, Fraksi, Difusi Agar

scholarly journals EKSTRAK DAUN KATUK (Sauropus androgynus (L) Merr) SEBAGAI ANTIBAKTERI TERHADAP Propionibacterium acnes dan Staphylococcus epidermidis

2017 ◽  
Author(s):  
Yuli Wahyu Tri Mulyani ◽  
Dadan Hidayat ◽  
Isbiyantoro Isbiantoro ◽  
Yeni Fatimah
Keyword(s):  
Antibacterial Activity ◽  
Propionibacterium Acnes ◽  
Positive Control ◽  
Inhibitory Response ◽  
Negative Control ◽  
Diffusion Method ◽  
Zone Diameter ◽  
Growth Inhibitory ◽  
Weak Growth ◽  
Common Plant

Katuk is one of the most common plant species in Indonesia which is known by the community to treat the disease, especially the leaf part can be used as a milk mat. katuk leaf (Sauropus androgynus (L) Merr) also contains saponin, flavonoid and tannin Inhibits the growth of bacteria one of the bacteria that cause acne bacteria P. acnes and S. epidermidis. The aim of this research is to know the antibacterial inhibition effect of katuk leaf extract to growth of P. acnes and S. epidermidis using Cup-plate or pit diffusion method with concentration 20%, 40%, 60%, 80% and 100%. Clindamycin is used as a positive control and aquades as a negative control. The leaves of katuk extracted with 70% ethanol solvent showed no antibacterial activity against P. acnes bacteria while against S. epidermidis bacteria showed antibacterial activity. The highest antibacterial activity at 100% concentration with 18.17 mm zone diameter belong to the category of inhibitory resistance of medium growth and the lowest concentration at concentration of 40% with 16.68 mm inhibitory zone diameter belong to the weak growth inhibitory response category. The minimum inhibitory concentrations produced in S. epidermidis bacteria were 39% - 36%. Keywords : Sauropus androgynus, Propionibacterium acnes, Staphilococcus epidermidis, Minimal Inhibitory Concentration.

scholarly journals Design, synthesis and biological evaluation of organotin(IV) complexes of flumequine and cetirizine

2018 ◽  
Vol 83 (4) ◽  
pp. 425-437 ◽  
Author(s):  
Syed Iftikhar ◽  
Syeda Gilani ◽  
Babar Taj ◽  
Ahmad Raheel ◽  
U Ud-Din-Imtiaz ◽  
...  
Keyword(s):  
Biological Evaluation ◽  
Bidentate Ligand ◽  
Carboxylate Ligand ◽  
Binding Studies ◽  
Tetrahedral Geometry ◽  
Design Synthesis ◽  
Dna Binding Studies ◽  
Thermal Analysis Techniques ◽  
Antibacterial And Antifungal ◽  
Oxygen Atoms

Six new organotin(IV) derivatives [Me3SnL1] (1), [Bu3SnL1] (2), [Ph3SnL1] (3), [Me3SnL2] (4), [Bu3SnL2] (5) and [Ph3SnL2] (6) (where HL1 = = 9-fluoro-6,7-dihydro-5-methyl-1-oxo-1H,5H-pyrido[3,2,1-ij]quinoline-2-carboxylic acid (flumequine) and HL2 = 2-[2-[4-[(4-chlorophenyl)phenylmethyl]- -1-piperazinyl]ethoxy] acetic acid (cetirizine)) were synthesized and characterized by elemental analysis, FT-IR spectroscopy, multinuclear 1H-, 13C- and 119Sn-NMR, mass spectrometry and thermal analysis techniques. The obtained data reveal trigonal-bipyramidal geometry in case of complexes 1, 2, 4 and 5, and tetrahedral geometry for complexes 3 and 6 around the tin atom, whereas in complexes 3 and 6 the carboxylate ligand act as monodentate ligand through one of its oxygen atoms while it acts as bidentate ligand through two oxygen atoms for complexes 1, 2, 4 and 5. The antibacterial and antifungal efficacies of complexes 1?6 were assessed and the majority of the compounds showed good activities. The present research showed that the trimethyltin(IV) derivatives were particularly more effective than tributyltin(IV) and triphenyltin(IV) derivatives against all the bacterial and fungal strains. Antioxidant and DNA binding studies were also performed and promising results were obtained.

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