Drug Ciprofloxacin Research Articles

Fabrication of an efficient MXene based ternary nanocomposite of bismuth vanadate-bismuth sulfide as photocatalyst for the degradation of harmful industrial effluents

The current research work is based on the synthesis of BiVO4 (BVO), Bi2S3 (BS), a binary composite of BiVO4 and Bi2S3 (BVO-BS), and MXene-based ternary nanocomposite of BiVO4 and Bi2S3 (BVO-BS/MXene). BVO nanoparticles and BS nanorods were synthesized by co-precipitation and hydrothermal approaches respectively. While the binary (BVO-BS), and ternary (BVO-BS/MXene) nanocomposites were synthesized by an ultra-sonication method. The fabricated semiconducting materials were characterized by X-ray diffraction analysis, Fourier transforms infrared spectroscopy, and Scanning electron microscopy. Furthermore, the optical and electrochemical properties of synthesized samples were studied by UV–visible spectroscopy and Mott-Schottky/Electrochemical impedance spectroscopy analysis respectively. The photocatalytic removal efficiency of prepared samples was tested against an organic dye (Congo red) and pharmaceutical drug (Ciprofloxacin). The experimental results showed that (BVO-BS/MXene) ternary nanocomposite removed 92.5% congo red and 36.95% ciprofloxacin from wastewater under the visible light irradiation of about 70 min. While the binary composite; BVO-BS removed only 71.30% congo red and 22.61% ciprofloxacin within 70 min of irradiation. This outstanding degradation ability of BVO-BS/MXene for both Congo red and Ciprofloxacin as compared to binary composite (BVO-BS) was due to its large surface area, low charge transfer resistance (Rct = 0.96 ohm), and low electron-hole pair recombination. Hence, BVO-BS/MXene is a novel and promising photocatalytic material that could be used as an efficient photocatalyst for environmental pollution remediation applications.

Photo-catalytic applications of green synthesized AM-Ag/CuO/ZnO nano-composite and its synergistic effects

Toxic organic and inorganic chemical contaminants in the discharged effluents from textile and pharmaceutical industries have been directly polluting fresh and marine water bodies. The present study described significant degradation of two common water contaminants viz Methylene blue (MB) dye and Ciprofloxacin (CF) drug using green synthesized three mono-metallics AM-AgNP, AM-CuONP, AM-ZnONP (AM = Plant code, NP = Nanoparticles) and one trimetallic AM-Ag/CuO/ZnO nano-composite (TMNC). The biomolecules present in the leaf extract of A. monohpylla (AM) and microwave irradiation play a crucial role in tuning the nanomaterial’s size and shape. The spherical to rod shaped monometallic and irregular-shaped (spherical to oval) TMNC have shown polycrystalline nature with the FCC (AM-AgNP), monoclinic (AM-CuONP), wurtzite (AM-ZnONP) and mixed (AM-Ag/CuO/ZnO NC) crystal phases. Mono-metallics have shown significant degradation activity of 98.69% (50 min), 97.87% (70 min), 99.95% (50 min) and 59.48% (120 min), 64.69% (300 min), 76.13% (300) at 0.5 mg/ml of AM-AgNP, AM-CuONP, AM-ZnONP respectively against MB dye and CF drug. However, at the same concentration (0.5 mg/ml) TMNC degraded 99.5% MB dye and 97.53% CF drug within 40 min and 180 min respectively that reinforce the synergistic activity of the combined nano-materials at the specific concentration ratio. The R2 value confirmed that all the reactions followed the pseudo-zero order reaction, kinetic models.

Chemico-pharmacological and computational studies of Ophiorrhiza fasciculata D. Don and Psychotria silhetensis Hook. f. focusing cytotoxic, thrombolytic, anti-inflammatory, antioxidant, and antibacterial properties

The current study sought to examine the pharmacological potentials of crude methanolic extracts of Ophiorrhiza fasciculata and Psychotria silhetensis, as well as their various solvent fractionates, with a focus on cytotoxic, thrombolytic, membrane stabilizing, antioxidant, and antibacterial activities via in vitro and in silico approaches. The extensive chromatographic and spectroscopic analyses confirmed and characterized two compounds as (±)-licarin B (1) and stigmasterol (2) from O. fasciculata and P. silhetensis, respectively. Petroleum ether soluble fraction of O. fasciculata and the aqueous soluble fraction of P. silhetensis showed the lowest 50% lethal concentrations (1.41 and 1.94 μg/mL, respectively) in brine shrimp bioassay. Likewise, petroleum ether soluble fraction of O. fasciculata and aqueous soluble fraction of P. silhetensis showed the highest thrombolytic activity with 46.66% and 50.10% lyses of the clot, respectively. The methanol and dichloromethane soluble fractions of O. fasciculata reduced erythrocyte hemolysis by 64.03% and 37.08%, respectively, under hypotonic and heat-induced conditions, compared to 81.97% and 42.12% for standard acetylsalicylic acid. In antioxidant activity test, aqueous soluble fraction O. fasciculata (IC50 = 7.22 μg/mL) revealed promising antioxidant potentialities in comparison to standard butylated hydroxytoluene (IC50 = 21.20 μg/mL). In antibacterial screening, chloroform, and dichloromethane soluble fractions of P. silhetensis showed a mild antibacterial activity compared with the standard drug ciprofloxacin. Additionally, the molecular docking study corroborated the current in vitro findings, and the isolated two constituents had higher binding affinities toward epidermal growth factor receptor, tissue plasminogen activator, vFLIP-IKK gamma stapled peptide dimer, glutathione reductase, and dihydrofolate reductase enzyme than their corresponding standard drugs. In addition, the both isolated compounds exerted favorable pharmacokinetics (absorption, distribution, metabolism, excretion) and toxicological profiles with drug-like qualities in computational-based ADMET and drug likeliness analyses. The current research suggests that both plants have potential as a natural treatment for treating thrombosis, inflammation, and oxidative stress. However, more thorough research is required to thoroughly screen for phytochemicals and pinpoint the precise mechanisms of action of the bioactive metabolites derived from these plants against a broad range of molecular targets.

Design, Synthesis, and Antimicrobial Activity Evaluation of Ciprofloxacin-Indole Hybrids.

With the overuse and misuse of antimicrobial drugs, antibacterial resistance is becoming a critical global health problem. New antibacterial agents are effective measures for overcoming the crisis of drug resistance. In this paper, a novel set of ciprofloxacin-indole/acetophenone hybrids was designed, synthesized, and structurally elucidated with the help of NMR and high-resolution mass spectrometry. The in vitro antibacterial activities of these hybrids against gram-positive and gram-negative pathogens, including four multidrug-resistant clinical isolates, were evaluated and compared with those of the parent drug ciprofloxacin (CIP). All the target compounds (MIC = 0.0625-32 μg/mL) exhibited excellent inhibitory activity against the strains tested. Among them, 3a (MIC = 0.25-8 μg/mL) showed comparable or slightly less potent activity than CIP. The most active hybrid, 8b (MIC = 0.0626-1 μg/mL), showed equal or higher activity than CIP. Moreover, compound 8b showed superior bactericidal capability to CIP, with undetectably low resistance frequencies. Furthermore, molecular docking studies conducted showed that 8b and CIP had a similar binding mode to DNA gyrase (Staphylocouccus aureus). Thus, hybrids 3a and 8b could act as a platform for further investigations.

SYNTHESISAND ANTIMICROBIAL STUDIES OF SCHIFF BASE DERIVED FROM2-THENOYLTRIFLUOROACETONE AND 4-AMINOANTIPYRINEAND ITSCo(II), Fe(III), Ni(II) AND Cu(II) COMPLEXES

A new ligand, 3-[2-(1, 5-dimethyl-3-oxo-2-phenyl-2, 3-dihydro-1H-pyrazol-4-yl) hydrazinylidene]-2-thenoyltrifluoroacetone (HPDP) was prepared by diazotization of 4-aminoantipyrine and coupling of the obtained diazonium salt with 2-thenoyltrifluoroacetone. It’s Co(II), Fe(III), Cu(II), Ni(II) complexes were synthesized by refluxing the ligand(HPDP) with the metal chlorides in absolute ethanol for 6 hrs. Obtained compounds were characterized by means of melting point, conductivity, elemental analysis UV-Visible, FT-IR, 1H and 1 3C NMR.The molar conductivity values indicated that,[Fe(PDP)(H2O)Cl2], [Co(PDP)Cl2(OH2)], [Cu(HPDP)Cl2], [Ni(PDP)Cl2(OH2)] complexes were electrolytes when compared with CuSO4 and KCl salts respectively. The chloride analysis determination revealed the presence of chloride ions inside the coordination sphere of all the complexes. The Uv-Vis, IR, 1H and 13CNMR data of the complexes suggest square-planar geometry around Co (II), Cu (II), Ni (II) and octahedral geometry around Fe (III) ions. The ligand is tridentate and the complexes crystalized as M (HPDP). The ligand coordinated through the carbonyl oxygens and nitrogen atom of the azomethine –C=N group. The antimicrobial screening of the ligand and complexes with B.subtilis, E.coli, and P.mirabilis,S. aureus, S. intermediusS. typhi and S. pneumoniae showed more activities for the complexes than the ligand in comparison with standard drugs (Ampicillin and Ciprofloxacin), this implies that the synthesized compounds have potency for possible use as antbacterial agents against resistant strains.

Synthesis, X-ray crystallography, antimicrobial, molecular docking, and DFT study of bis-triazoles linked ampyrone

A new class of bis-triazoles linked with ampyrone molecules was synthesized from ampyrone-linked bis-alkyne with different benzyl azides under Cu(I)-catalyzed azide-alkyne cycloaddition (CuAAC) reaction. All compounds were characterized by FTIR, 1H NMR, 13C NMR, and ESI-MS data. However, the structures of solid crystalline compounds 4a and 4h were finally supported by X-ray crystallographic data. In vitro, antimicrobial activity results of synthesized alkyne 2 and bis-1,2,3-triazoles 4a-4k showed that the incorporation of triazole units has augmented the antimicrobial activity of all compounds, except 4a for E. coli. Also, compound 4f was found potent against all bacterial strains (E. coli, S. aureus, and P. aeruginosa, each with MIC: 0.0178 µmol/mL) with superior efficacy to B. subtilis (MIC: 0.0089 µmol/mL) compared to standard antibacterial drug ciprofloxacin (MIC: 0.0094 µmol/m). Almost all synthesized triazoles showed superior potency to both fungal strains except 4a, 4g, and 4k against R. oryaze, C. albicans, and R. oryaze, respectively. Computational molecular docking and DFT results supported experimental antimicrobial results for improvement in the activity of all triazoles except 4a.

Synthesis and Anticancer Evaluation of 4-Chloro-2-((5-aryl-1,3,4-oxadiazol-2-yl)amino)phenol Analogues: An Insight into Experimental and Theoretical Studies.

We report herein the synthesis, docking studies and biological evaluation of a series of new 4-chloro-2-((5-aryl-1,3,4-oxadiazol-2-yl)amino)phenol analogues (6a-h). The new compounds were designed based on the oxadiazole-linked aryl core of tubulin inhibitors of IMC-038525 and IMC-094332, prepared in five steps and further characterized via spectral analyses. The anticancer activity of the compounds was assessed against several cancer cell lines belonging to nine different panels as per National Cancer Institute (NCI US) protocol. 4-Chloro-2-((5-(3,4,5-trimethoxyphenyl)-1,3,4-oxadiazol-2-yl)amino)phenol (6h) demonstrated significant anticancer activity against SNB-19 (PGI = 65.12), NCI-H460 (PGI = 55.61), and SNB-75 (PGI = 54.68) at 10 µM. The compounds were subjected to molecular docking studies against the active site of the tubulin-combretastatin A4 complex (PDB ID: 5LYJ); they displayed efficient binding and ligand 4h (with docking score = -8.030 kcal/mol) lay within the hydrophobic cavity surrounded by important residues Leu252, Ala250, Leu248, Leu242, Cys241, Val238, Ile318, Ala317, and Ala316. Furthermore, the antibacterial activity of some of the compounds was found to be promising. 4-Chloro-2-((5-(4-nitrophenyl)-1,3,4-oxadiazol-2-yl)amino)phenol (6c) displayed the most promising antibacterial activity against both Gram-negative as well as Gram-positive bacteria with MICs of 8 µg/mL and a zone of inhibition ranging from 17.0 ± 0.40 to 17.0 ± 0.15 mm at 200 µg/mL; however, the standard drug ciprofloxacin exhibited antibacterial activity with MIC values of 4 µg/mL.

Synthesis and Antibacterial Activity of Some Newer Thiazolidine-2,4-Dione Derivatives

Thiazolidin-2,4-diones were intensively studied for its antidiabetic property in 1982. Thiazolidin-2,4-diones have also been demonstrated to possess different biological activity like anticancer, anti-HIV, antitumor, antimicrobial, antiviral and antiproliferative activity. 3-Benzoyl-5-(substituted benzylidine)-thiazolidin-2,4-diones and 3-p-Tolyl-5-(substituted benzylidine)-thiazolidin-2,4-diones have evaluated as structurally novel antimicrobials. A series of 5-[(SubstitutedPhenylamino)benzylidine]thiazolidine-2,4-dione derivatives 17(a-j) were synthesized by nucleophilic substitution reaction of (Z)-5-(2-Fluororobenzylidin)-thiazolidin-2,4-dione with various benzaldehyde derivatives and (Z)-5-(2-Fluororobenzylidin)-thiazolidin-2,4-dione were synthesized by condensation of thiazolidin-2,4-dione with p-fluorobenzaldehyde. The reaction was monitored by TLC on silica gel G plates and the final compounds were purified by recrystalization from ethanol.The structure of newly synthesized compounds 17(a-j) were confirmed by FTIR, 1H NMR, EIMS spectral analysis and elemental analysis. All the synthesized compounds were screened for antibacterial. Antibacterial activity was screened against Gram positive (B. subtilis, P. aeruginosa) and Gram negative bacteria (E.coli, S. aureus) by paper disc diffusion method, using nutrient agar medium. The compounds substituted with hydroxyl, methoxy, nitro and chloro on aryl ring attached with thiazolidin-2,4-dione showed good antibacterial activity. The synthesized compound: 17c and 17d showed significant antibacterial activity against gram positive bacterial strain B.subtilis and S.aureus and compound 17g showed significant antibacterial activity against gram negative bacterial strains E.coli and P.aeruginosa. The zone of inhibition was compared with standard drugs ciprofloxacin at 50 μg/ml concentration.

Public health concerns for food contamination in Ghana: A scoping review.

Nutrition is sturdily and rapidly becoming the foremost determinant of health in today's Sars-Cov-2 and climate change ravaged world. While safe food sustains life, contamination obliterates its values and could result in death and short to long term morbidity. The purpose of this scoping review is to explore food contamination in Ghana, between 2001-2022. Using Arksey and O'Malley's procedure, a systematic literature search from PubMed, JSTOR, ScienceDirect, ProQuest, Scopus, Emeralds Insight, Google Scholar, and Google was carried out. Following the inclusion criteria, 40 published and grey literature were covered in this review. The review revealed the following: Studies on food contamination involving Greater Accra, Ashanti, Central, and Eastern Regions alone account for over 50% of the total number of such studies conducted in Ghana; regulators failed in enforcing regulations, monitoring and supervision; managers failed to provide adequate infrastructure and facilities. The most common food safety risks of public health concern are: i) micro-organisms (E. coli/faecal coliforms, Staphylococcus aureus, Salmonella spp, Bacillus cereus, and Viral hepatitis); ii) drugs (Amoxicillin, Chlortetracycline, Ciprofloxacin, Danofloxacin, and Doxycycline) and; iii) chemicals (Chlorpyrifos). Salad, vegetables, sliced mango, meat pie, and snail khebab are of high public health risks. The following deductions were made from the review: Highly contaminated food results in death, short to long term morbidity, economic loss, and threatens to displace Ghana's efforts at achieving the Sustainable Development Goals (SDG) 2. Thus, Government must resource key regulatory bodies to enhance their operational capacity, regulators must foster collaboration in monitoring and supervision of food vendors, and managers of food service outlets must provide adequate facilities to engender food safety culture.

Phytochemical and antibacterial studies of methanolic extract and fractions of <i>Guiera senegalensis</i> leaves

The aim of the research study was to carry out phytochemical and antibacterial studies of methanolic leaves extract and its fractions of Guiera senegalensis. The plant material was collected, identified, shed dried and pulverized to fine powder using pestle and mortar. The powdered plant material was subjected to maceration using methanol to obtained crude methanol leaf extract which was then partitioned using n-hexane, chloroform ethyl acetate and n-butanol. The extract and the fractions obtained were subjected to phytochemical screening using standard procedure, to detect the presence of secondary metabolites. The antibacterial assay of the extract and its fractions against S. aureus, B. subtilus, P.mirabilis and S. typhyrium were investigated using agar well diffusion method at different concentration (100 – 12.5 mg/mL). The phytochemical screening revealed the presence of various secondary metabolites which varies in the extract and fractions. The extract and its fractions showed significant (p< 0.05) antibacterial activities against all the test isolates with the methanol extract having the highest mean zone of inhibition ranging from 2.00±1.00d-24.00±1.00* mm then followed by ethyl acetate fraction with the mean zone of inhibitions from 4.00±1.00d-22.00±1.00* mm the n-butanol fraction and the chloroform fraction had mean zone from 4.00±1.00d-18.50±1.00* mm and 4.00±1.00d-17.60±1.00d mm respectively while n-hexane fraction recorded lower mean zone of inhibition from 4.00±1.00a-15.00±1.00* The standard drug Ciprofloxacin had mean zone of inhibition from 16.20±0.00-39.0±0.00 mm. The most sensitive organism was S. aureus, while the least sensitive organism was S. typhyrium. The study has validated the ethnomedicinal claim for the use of this plant in treatment of antibacterial infections.

The Assessment of Cytotoxicity, Apoptosis Inducing Activity and Molecular Docking of a new Ciprofloxacin Derivative in Human Leukemic Cells.

The fluoroquinolone class of antibiotics includes derivatives of the drug ciprofloxacin. These substances have recently been advocated for the treatment of cancer. In the current study, we examined the cytotoxicity and apoptosis-inducing potential of a novel synthetic ciprofloxacin derivative in the human myeloid leukemia KG1-a cell line. With an IC50 of 25µM, this ciprofloxacin derivative, 7-(4-(2-(benzhydryloxy)-2-oxoethyl) piperazin-1-yl)-1-cyclopropyl-6-fluoro-4-oxo-1,4 dihydroquinoline-3- carboxylic acid (4-BHPCP), was an active drug. Through Hoechst 33,258 staining and Annexin V/PI double staining experiments, the apoptotic activity of the 4-BHPCP was assessed morphologically. Real-time quantitative PCR was used to assess changes in the expression level of certain apoptosis-related genes, including Bcl-2, Bax, and Survivin (qRT PCR). The results of the qRT PCR analysis demonstrated that 4-BHPCP promotes apoptosis in the KG1-a cell line by down-regulating Survivin and Bcl2, up-regulating Bax, and increasing the Bax/Bcl2 transcripts in a time-dependent manner. These results imply that this novel chemical may be a promising therapy option for acute myeloid leukemia.

Green synthesis of Plectranthus amboinicus leaf extract incorporated fine-tuned manganese dioxide nanoparticles: Antimicrobial and antioxidant activity

Plectranthus amboinicus Manganese dioxide (PA-MnO2) nanoparticles were synthesized by the reduction of potassium permanganate (KMnO4) using Plectranthus amboinicus (P. amboinicus) leaf extract at room temperature. A dark brown colour appeared after the addition of leaf extract to the solution of KMnO4. PA-MnO2 nanoparticles showed absorbance maximum at 324 nm. Scanning Electron Microscopy (SEM) study of particle size and morphology revealed that PA-MnO2 nanoparticles have spherical structures in shape. The electron dispersive X-ray spectroscopy confirmed the presence of Mn and O in the sample. Fourier Transforms infrared spectra of PA-MnO2 nanoparticles show the occurrence of O-Mn-O vibrational mode at around 515 cm-1. Based on the spectral and morphological data confirms the prepared compounds are nanometer in size. The structural investigation of MnO2 nanoparticles using the powder X-ray diffraction method reveals that the nanoparticles have a tetragonal configuration. Powder X-ray diffraction measurements were used to estimate crystallite grain diameter. The size of the crystalline grains is 7.5 nm. The PA-MnO2 nanoparticles demonstrated enhanced antibacterial activity against various gram positive bacteria like as S. aureus, S. pneumoniae, Stap. Pneumoniae and B. subtilis and various gram negative bacterial strains like as E. coli, K. pneumoniae, p. mirabilis and P. aeruginosa than standard drug ciprofloxacin. Antifungal activity of PA-MnO2 nanoparticles exhibited abnormal character against various fungal strains such as A. niger, C. albicans, C. tropicalis and M. campestris than the standard drug nystatin. Free radical scavenging study by DPPH assay showed enhanced activity by increasing the concentration of PA-MnO2. This study shows simple and eco-friendly synthesis of PA-MnO2 nanoparticles by plant extract. PA-MnO2 nanoparticles by green approach have potential to resolve emerging drug resistance against pathogenic diseases.

Electrochemical Sensor Based on the Hierarchical Carbon Nanocomposite for Highly Sensitive Ciprofloxacin Determination.

A new voltammetry method for the highly sensitive antibacterial drug ciprofloxacin (CIP) is presented using glassy carbon electrodes modified with hierarchical electrospun carbon nanofibers with NiCo nanoparticles (eCNF/CNT/NiCo-GCE). The use of a modified glassy carbon electrode in the form of hierarchical electrospun carbon nanofibers with NiCo nanoparticles (eCNF/CNT/NiCo) led to an LOD value as low as 6.0 µmol L-1 with a measurement sensitivity of 3.33 µA µmol L-1. The described procedure was successfully applied for CIP determination in samples with complex matrices, such as urine or plasma, and also in pharmaceutical products and antibiotic discs with satisfactory recovery values ranging between 94-104%. The proposed electrode was characterised by great stability, with the possibility of use for about 4 weeks without any significant change in the CIP peak current. The repeatability of the CIP response on the eCNF/CNT/NiCo/GC is also very good; its value measured and expressed as RSD is equal to 2.4% for a CIP concentration of 0.025 µmol L-1 (for 7 consecutive CIP voltammogram registrations). The procedure for electrode preparation is quick and simple and does not involve the use of expensive apparatus.

Cyclization of Chalcone Derivatives: Design, Synthesis, In Silico Docking Study, and Biological Evaluation of New Quinazolin-2,4-diones Incorporating Five-, Six-, and Seven-Membered Ring Moieties as Potent Antibacterial Inhibitors.

Four novel series of quinazolin-2,4-diones bearing five-, six-, and seven-membered heterocyclic moieties 2-14 (such as pyrazole, oxazole, pyrimidine, and azepines) through the 1,4-phenyl linkage were designed, synthesized, and evaluated in terms of their antibacterial activities. Analytical and spectral techniques (FT-IR, 1H NMR, 13C NMR, and Mass) were utilized for the structural elucidation of all of the synthesized compounds 2-14. Furthermore, the potential antibacterial activity of the thirteen compounds was further evaluated in vitro against two different Gram-negative G-ve bacterial strains (named Escherichia coli ATCC 25955, Pseudomonas aeruginosa ATCC 10145) and two Gram-positive G+ve bacterial strains (named Bacillus subtilis ATCC 6633 and Staphylococcus aureus NRRL B-767). Investigation of the antibacterial potential indicated that the newly synthesized compounds, especially 13, exhibited remarkable antibacterial activity against pathogens, comparable to the standard drug ciprofloxacin (a known potent antibacterial agent). Additionally, compounds 2-14 and ciprofloxacin were assessed in silico using molecular docking studies against the target thymidine phosphorylase enzyme (PDB ID: 4EAD). Moreover, the structure activity relationship (SAR) for these compounds was also described to give guidance about the effective molecules that could play an important role in identifying potential antibacterial agents. Finally, the drug-likeness and physicochemical parameters of the newly synthesized molecules 2-14 were in silico investigated. Among them, we found that the compound 3-[4-(6-phenyl-6,7-dihydro-5-oxa-9-aza-benzocyclohepten-8-yl)-phenyl]-1H-quinazolin-2,4-dione 13 with the highest binding affinity showed a strong fit to the active site of the tested enzyme, indicating 13 as a promising drug candidate for designing and developing novel classes of antibiotics.

Boosting the antimicrobial and Azo dye mineralization activities of ZnO ceramics by enhancing the light-harvesting and charge transport properties

Herein, we report the wet-chemical synthesis of a ferromagnetic nickel-doped ZnO (Zn1-xNixO) nanocatalyst as a novel and visible-light-driven photocatalyst. Through X-ray diffraction, UV/Vis absorption, electronic studies, and current-voltage experiments, the effect of the ferromagnetic nickel dopant on the structural, optical, morphological, and electrical properties of the synthesized Zn1-xNixO nanocatalyst was studied. The Ni-doping introduced the structural variation in the Zn1-xNixO nanocatalyst, exhibiting a visible light-triggered optical band gap of 2.96 eV and an excellent current conductivity of 6.3 × 10−4 Sm−1. Moreover, the synthesis of the Zn1-xNixO catalyst at the nanoscale enhanced its surface energy, showing a robust affinity to stick with the dye and pathogenic microbes. The synergistic effects of all the mentioned features enable our Zn1-xNixO nanocatalyst to efficiently generate and transport reactive oxygen species (ROS) under visible light illumination. Regarding antibacterial action, the as-synthesized Zn1-xNixO nanocatalyst showed 1.7% higher activity against E. coli than that of the drug Ciprofloxacin. In addition, doped nanocatalysts mineralize almost 97% of the Allura red dye in just 80 min with a constant rate value of 0.036 min−1. The impedance study and post-application XRD proposed that our Zn1-xNixO nanocatalyst has good conductivity and structural stability. Applications studies show the unusual photocatalytic activity of as-synthesized Zn1-xNixO nanocatalysts, which makes it a suitable candidate for industrial discharge treatment applications at the expense of solar light.

Steroid‐Hymecromone Conjugates with Improved Antiproliferative and Antimicrobial Potential: Synthesis, Biological Evaluation, and in silico ADME Prediction

AbstractIn this study, hymecromone with known therapeutic aspects was conjugated with steroids a class of natural products that widely exhibited broad biological functions. Cholic acid, diosgenin, cholesterol, DHEA, and testosterone were selected as steroid moiety, each of which has a different biological mechanism of action. This study focused on developing novel conjugates that can be used as multi‐targeted drugs for treating various diseases. All conjugates were evaluated in vitro for their antiproliferative and antimicrobial activities and discussed for the structure‐activity relationship. The conjugates 5 and 6 exhibited comparable cytotoxic effects to reference drugs against cancer cell lines (K562, MCF‐7, and HeLa) while showing no toxicity against healthy cells (L929). Conjugates 7 and 5 demonstrated antibacterial activity against Gram‐positive and Gram‐negative bacteria, with lower minimum inhibitory concentration (MIC) values than the standard ciprofloxacin drug. Conjugate 6, On the other hand, had the lowest MIC value against the fungus, comparable to that of the standard drug ketoconazole. The physicochemical and pharmacokinetic properties of conjugates were in silico computed and evaluated. Overall, the outputs of this study suggest that these conjugates have promising potential as therapeutic agents, offering a multi‐targeted approach for the treatment of various diseases.

One-pot mediated synthesis of pyrimidine and quinazoline annulated derivatives of nitrogen containing five membered rings through their nitrile derivatives as antibacterial agents

ABSTRACT. Novel five-membered ring (pyrrole, pyrazole and imidazole)-based pyrimidine and quinazoline derivatives were synthesized by one-pot domino approach. This approach has the advantages of high yield, mild reaction conditions and a simple work-up procedure. The structure of the synthesized compound was elucidated by spectroscopy technique and elemental analysis. The synthesized compound were examined for antimicrobial activity against four bacteria (E. coli, S. pyogenes, S. aureus, and P. aeruginosa) and two fungi (C. albicans and A. clavatus) and most of the synthesized compound exhibited moderate to good activity against reference drug ampicillin, ciprofloxacin, norfloxacin, gentamycin, nystatin and griseofulvin, respectively.
 
 KEY WORDS: One-pot, Pyrrole, Pyrazole, Imidazole, Pyrimidine, Quinazoline, Antimicrobial activity
 
 Bull. Chem. Soc. Ethiop. 2023, 37(5), 1193-1208. 
 DOI: https://dx.doi.org/10.4314/bcse.v37i5.12

Analisis In Silico : Aktivitas Senyawa Antibakteri dalam Zingiber aromaticum terhadap Salmonella typhi

Typhoid fever is an acute infectious disease of the small intestine caused by the bacterium Salmonella typhi. The prevalence of typhoid fever in the world is 27 million cases per year and causes 200,000 deaths. In Indonesia, it is estimated that the incidence of typhus is 148.7 per 100,000 people per year. Treatment of typhoid fever using ciprofloxacin antibiotics still causes bacterial resistance so that the discovery of herbal ingredients as an alternative to typhoid fever drugs is still being developed. This study aims to look at the potential of the active compound Zingiber aromaticum in terms of physicochemical prediction, pharmacokinetics, binding affinity, and level of toxicity. Previous studies have proven that Zingiber aromaticum has the potential to inhibit Pseudomonas aeruginosa and Salmonella typhi bacteria. The method used is molecular docking between the active compounds Zingiber aromaticum to be compared with the control drug ciprofloxacin as a comparison. As a result, all active compounds of Zingiber aromaticum have potential as drug candidates because they fulfill the lipinski’s rule of five. Zerumbon has the best pharmacokinetic profile compared to ciprofloxacin. Compounds in class 4, 5 and 6 are relatively safer, not mutagenic and not toxic to the liver compared to ciprofloxacin. The compounds that have a better binding affinity value than ciprofloxacin are isokaempferide, (-)-beta-Sitosterol, afzelin, kaempferol 3-(3'-acetylrhamnoside), and 3-O-beta-D-Glucopyranosyl sequentially namely -8,1 kcal/mol, -9.0 kcal/mol, -9.4 kcal/mol, -9.3 kcal/mol and -9.3 kcal/mol. The most valid compounds compared to ciprofloxacin are (-)-beta-sitosterol with RMSD l.b 1.513 and RMSD u.b 2.169.

Synthesis, antibacterial screening and computational studies of quinazoline-4 (3H)-one-triazole conjugates

A novel series of quinazoline-4 (3H)-one-tagged triazole conjugates were synthesised using the copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC) methodology. All synthesized compounds were structurally elucidated with the help of 2D-NMR (HMBC, HSQC, COSY) techniques and other spectral evidence. The in vitro antibacterial activities of these compounds were evaluated and compared with commercial drugs ciprofloxacin, ampicillin, and levofloxacin. Four compounds (4a, 4d, 4g, and 4i) of the series exhibited potent activity and selectivity against the gram-negative bacterial strains. Amongst these, 4i emerged as the most active conjugate with almost 12-fold superior activity to ampicillin against Klebsiella pneumoniae (gram-negative), one of the most challenging multidrug-resistant strains worldwide. Structure-activity relationship (SAR) analysis further revealed that the incorporation of a triazole ring incredibly increased the antibacterial activity of quinazoline Schiff bases towards the gram-negative bacteria. Moreover, the para-positioning of strong electron-donating (–OCH3) and electron-withdrawing (-NO2) groups at the phenyl ring of the triazole ring positively influenced the antibacterial activity, whereas the meta-substitution generally decreased the antibacterial activity of the conjugates. Furthermore, molecular docking studies were conducted to explore the binding characteristics of these compounds in the binding site of DNA gyrase (Staphylocouccus aureus).

ACTIVITY OF LIVER FUNCTION ENZYME AND ANTIBACTERIAL SUSCEPTIBILITY OF ANNONA SENEGALENSIS LEAF EXTRACT

In ethnomedicine, various natural products have been implicated in the treatment of several diseases. Annona senegalensis has been identified as one of the plants that have the potential to cure ailments arising from microbial infections. This study however was carried out to investigate the liver function enzyme activity and in vitro antibacterial susceptibility of the 50% ethanol-methanol leaf extract of A. senegalensis. The effect of the administration of 100 mg/kg body weight of A. senegalensis on serum enzyme parameters and antibacterial susceptibility was investigated in albino rats. Thirty-three albino rats with average weights of 200 g were divided into two groups. Group 1 contained 30 rats and was treated with 20 mg/mL of A. senegalensis leaf extract while Group 2 contained three rats and served as the control. The treatment lasted for 20 consecutive days while the rats in Group 1 were daily administered with the leaf extract of A. senegalensis. Data were analyzed and presented using a descriptive analysis from Microsoft Excel 2016 version. The results obtained from administration of the leaf extract of A. senegalensis on serum enzymes parameters show a significant increase in serum enzyme activity when compared to the control. This indicates that the leaf extracts of A. senegalensis have significant effects on the serum enzymes parameters. The in vitro antibacterial susceptibility of the leaf extracts relative to the drugs (Ampicillin and Ciprofloxacin) revealed that the leaf extract of the plant holds much promise in antibacterial property when combined with antibiotics used in this study. This research revealed that there is high activity of alkaline phosphatase, aspartate aminotransferase, and alanine aminotransferase in the serum following the administration of 100 mg/kg body weight of 50% ethanol-methanol leaf extract of A. senegalensis. The antibacterial susceptibility test of the leaf extract carried out in vitro also revealed the plant antibacterial property. The combination of A. senegalensis leaf extract with antibiotic drugs, especially the one used in this study hold much promise in its efficacy as revealed in its synergistic interaction.