scholarly journals Antibacterial Activity of CuO Nanoparticles Synthesized by Justicia adhatoda Leaf Extract

2021 ◽  
pp. 160-170
Author(s):  
S. Alwin David ◽  
P. Subramanian
Keyword(s):  
Antibacterial Activity ◽  
Leaf Extract ◽  
Visible Spectrum ◽  
Cuo Nanoparticles ◽  
Design Synthesis ◽  
Cuo Nps ◽  
Uv Visible ◽  
Justicia Adhatoda ◽  
Xrd Patterns

Aims: To determine the antibacterial activity of CuO nanoparticles (CuO NPs) synthesized by Justicia adhatoda leaf extract. Study Design:  Synthesis, characterization and antibacterial activity determination of CuO NPs. Place and Duration of Study: PG and Research Department of Chemistry, V.O.Chidambaram College, Tuticorin, Tamilnadu, India, between April 2019 and April 2020. Methodology: CuO NPs were synthesised using Justicia adhatoda leaf extract. UV-Visible spectroscopy was used to characterize CuO NPs. The role of biomolecules in plant extract in the formation of the CuO NPs was identified using Fourier transform infrared spectroscopy. The particle size and lattice properties of CuO NPs were determined using XRD. The surface morphology of CuO NPs was studied using SEM. The presence of Cu and O in CuO NPs was confirmed using EDAX analysis. Bacterial antimicrobial activity was investigated. Results: An absorbance band at 285 nm in the UV–visible spectrum clearly revealed the formation of CuO NPs. In the FTIR, CuO NPs had a distinct absorption peak at 608 cm-1, confirming metal–oxygen stretching in Cu-O nanostructures. The presence of crystalline CuO NPs was confirmed by XRD patterns, and they were found to be spherical in shape with a size range of 23.21–37.57 nm, as evidenced by FESEM. The biosynthesized CuO NPs exhibited a strong antibacterial activity against Staphylococcus epidermidis and Bacillus cereus bacteria. Conclusion: Justicia adhatoda leaf extract mediated CuO NPs have shown significant antibacterial activity and they are considered potent antibacterial agents.

scholarly journals PLANT-MEDIATED ZNO NANOPARTICLES USING FICUS RACEMOSA LEAF EXTRACT AND THEIR CHARACTERIZATION, ANTIBACTERIAL ACTIVITY

2018 ◽  
Vol 11 (9) ◽  
pp. 463
Author(s):  
Arun Babu Birusanti ◽  
Umamahesh Mallavarapu ◽  
Devanna Nayakanti ◽  
Chandra Sekhar Espenti
Keyword(s):  
Antibacterial Activity ◽  
Leaf Extract ◽  
Research Work ◽  
Blue Emission ◽  
Hexagonal Structure ◽  
Diffusion Method ◽  
X Ray ◽  
Average Grain Size ◽  
Uv Visible ◽  
Ficus Racemosa

Objective: The motto of this research work was to synthesize the zinc oxide nanoparticles (ZnONPs) should be environmental friendly. Hence, it receives more attention toward the green route method.Methods: At last, the Ficus racemosa ZnONPs (FR-ZnONPs) were successfully synthesized using a simple protocol and eco favorable technique. This paper highlights the biosynthesis of ZnONPs using leaf extract of F. racemosa. Results: FR-ZnONPs formation was confirmed by the different spectral analysis such as UV-visible spectroscopy, Fourier transform-infrared spectroscopy (FTIR), X-ray diffraction (XRD), transmission electron microscopy (TEM), and electronic dispersive X-ray spectroscopy. UV-visible studies revealed that the intrinsic band gap absorptions were at 372 nm and photoluminescence study showed that the blue emission at 492, 481, 473, and 450 nm and the green emission at 540 nm, respectively. FR-ZnONPs are wurtzite hexagonal structure with an average grain size of 15 nm was found from XRD analysis.Conclusion: FR-ZnONPs exhibited good antimicrobial efficacy on Escherichia coli and Staphylococcus aureus with various concentrations (100 μg/mL, 75 μg/mL, and 50 μg/mL) by disc diffusion method. The results showed the good antibacterial activity of FR-ZnONPs on G+ve and G-ve bacteria.

Tamarix gallica leaf extract mediated novel route for green synthesis of CuO nanoparticles and their application for N-arylation of nitrogen-containing heterocycles under ligand-free conditions

RSC Advances ◽  
2015 ◽  
Vol 5 (51) ◽  
pp. 40628-40635 ◽  
Author(s):  
Mahmoud Nasrollahzadeh ◽  
S. Mohammad Sajadi ◽  
Mehdi Maham
Keyword(s):  
Catalytic Activity ◽  
Green Synthesis ◽  
Leaf Extract ◽  
Cuo Nanoparticles ◽  
Aryl Halides ◽  
Cuo Nps ◽  
Ligand Free ◽  
Tamarix Gallica

We report the green synthesis of CuO nanoparticles (CuO NPs) using Tamarix gallica leaf extract and their catalytic activity for N-arylation of nitrogen-containing heterocycles with aryl halides under ligand-free conditions.

scholarly journals Antibacterial Activity of TiO2 Nanoparticles Prepared by One-Step Laser Ablation in Liquid

2021 ◽  
Vol 11 (10) ◽  
pp. 4623
Author(s):  
Khawla S. Khashan ◽  
Ghassan M. Sulaiman ◽  
Farah A. Abdulameer ◽  
Salim Albukhaty ◽  
Mohammed A. Ibrahem ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Laser Ablation ◽  
Size Distribution ◽  
Diffusion Method ◽  
Laser Ablation In Liquid ◽  
Visible Absorption ◽  
Tio2 Nps ◽  
E Coli ◽  
Uv Visible ◽  
Xrd Patterns

Laser ablation in liquid was utilized to prepare a TiO2 NP suspension in in deionized distilled water using Q-switch Nd: YAG laser at various laser energies and ablation times. The samples were characterized using UV–visible absorption spectra obtained with a UV–visible spectrophotometer (UV-Vis,) Fourier transform infrared (FTIR), X-ray diffraction (XRD), and transmission electron microscope (TEM). While, UV-Vis spectra showed the characteristic band-to-band absorption peak of TiO2 NPs in the UV range. FTIR analysis showed the existence of O-Ti-O bond. XRD patterns indicated the presence of (101) and (112) plane crystalline phases of TiO2. TEM images showed a spherical-like structure of TiO2 NPs with various size distributions depending on the ablation period. It was also found that there is a relationship between laser ablation time and TiO2 NP size distribution, where longer ablation times led to the smaller size distribution. The antibacterial activity of TiO2 NPs was evaluated with different species of bacteria such as Escherichia coli, Pseudomonas aeruginosa, Proteus vulgaris, and Staphylococcus aureus, using the liquid approach. The optimum activity of TiO2 NPs is found to be against E. coli at 1000 μg mL−1. Furthermore, adding, TiO2 NPs (1000 μg mL−1) in the presence of amoxicillin has a synergic effect on E. coli and S. aureus growth, as measured by the well diffusion method. However, both E. coli (11.6 ± 0.57mm) and S. aureus (13.3 ± 0.57mm) were inhibited by this process.

Aqueous trifluoroacetic acid as a medium for organic reactions. I. Acidity functions and the identity of the manganese(VII) species found in powerfully acidic media

1976 ◽  
Vol 54 (3) ◽  
pp. 440-447 ◽  
Author(s):  
Udo A. Spitzer ◽  
Trevor W. Toone ◽  
Ross Stewart
Keyword(s):  
Trifluoroacetic Acid ◽  
Water System ◽  
Visible Spectrum ◽  
Pair Formation ◽  
Acidity Function ◽  
Acidic Media ◽  
Uv Visible ◽  
Acidity Functions ◽  
Trifluoroacetate Complex

The HR acidity function has been determined for the trifluoroacetic acid–water system, and extended beyond 100% acid by the addition of trifluoroacetic anhydride, to 99.5 wt.% anhydride. The existing H0 acidity function is corrected and extended to 100% trifluoroacetic acid, confirming Eaborn's observation that H0 attains a minimum value at approximately 97% acid. Comparison of the acidity functions shows that although trifluoroacetic acid is only weakly protonating, it is a strongly protonating-dehydrating medium. Changes in the uv–visible spectrum of potassium permanganate produced by changing acid concentration are used to calculate the degree of further ionization of the permanganate ion; the correlation of this with the HR acidity function further suggests the presence of the permanganyl cation, MnO3+, or its trifluoroacetate complex or ester, MnO3•O2CCF3, in these solutions. A cryoscopic investigation into the mode of ionization of permanganate in trifluoroacetic acid reveals that extensive ion-pair formation occurs in this solvent. Although this effect prevents an unequivocal determination of the number of solute particles being made the results are consistent with the presence of a permanganyl species in solution.

scholarly journals Green Synthesis and Characterization of Crystalline CuO Nanoparticles using Aqueous Mentha Piperita L. Leaf Extract

2021 ◽  
Vol 20 (2) ◽  
pp. 1-6
Author(s):  
Fatma A. Shtewi ◽  
Wedad M. Al-Adiwish ◽  
Hamid A. Alqamoudy ◽  
Awatif A. Tarroush
Keyword(s):  
Copper Oxide ◽  
Green Synthesis ◽  
Leaf Extract ◽  
Copper Oxide Nanoparticles ◽  
Cuo Nanoparticles ◽  
Mentha Piperita ◽  
Synthesis Process ◽  
Oxide Nanoparticles ◽  
Cuo Nps ◽  
Tauc Plot

Copper oxide nanoparticles are essential technology materials that are utilized as catalysts in the chemical industry, as well as in photonic and electronic devices and medical applications. Due to their applications in advanced technologies, we have concentrated on the production of CuO nanoparticles using enhanced, cost-effective, and environmentally friendly synthetic techniques. In this paper, we have presented a green synthesis technique to successfully synthesis copper oxide nanoparticles (CuO NPs) utilizing copper (II) sulfate pentahydrate (CuSO4.5H2O) as precursor salt and Mentha Piperita leaf extract as a reducing and stabilizing agent during the synthesis process. The precursor salt solution and reducing agent were mixed in a 1:1 volume ratio at 50 °C. The CuO NPs synthesized were confirmed by the characteristics Surface Plasmon Resonance (SPR) peak in the UV-visible region. Also, the optical direct band gap energy of the CuO NPs determined from the Tauc plot was 3.26 eV. The FTIR spectrum analysis confirmed existence of functional groups of polyphenols from Mentha piperita L. leaf extract, which are responsible for the reduction of Cu2+ ions and effective stabilization of CuO NPs. All the peaks observed in the XRD pattern revealed the production of CuO NPs having monoclinic structure with an average crystallite size of 42.51 nm. The surface morphology of the CuO nanoparticles was detected using SEM analysis. Further, the synthesis mechanism of CuO NPs has also been investigated.

Enhanced luminol–O2 chemiluminescence reaction by CuO nanoparticles as oxidase mimics and its application for determination of ceftazidime

2016 ◽  
Vol 8 (18) ◽  
pp. 3816-3823 ◽  
Author(s):  
Mortaza Iranifam ◽  
Amin Imani-Nabiyyi ◽  
Alireza Khataee ◽  
Jalil Kalantari
Keyword(s):  
Cuo Nanoparticles ◽  
Cuo Nps ◽  
Analytical Applications

A cursory survey of the literature shows that although peroxidase-like activity is a well-known and well-applied property of CuO nanoparticles (CuO NPs), the oxidase-like activity of CuO NPs is a property that is somehow neglected to be incorporated in analytical applications.

scholarly journals Solanum Nigrum Leaf Extract Capped Copper Oxide Nanoparticles and its Tetrahedral L2Cu(ɳ2-BH4) Complex for Effective Degradation of Congo Red

2021 ◽  
Author(s):  
Kijay Bahadur Singh ◽  
Neelam Gautam ◽  
Deen Dayal Upadhyay ◽  
Gulam Abbas ◽  
Gajanan Pandey
Keyword(s):  
Copper Oxide ◽  
Surface Area ◽  
Congo Red ◽  
Leaf Extract ◽  
Copper Oxide Nanoparticles ◽  
Solanum Nigrum ◽  
Oxide Nanoparticles ◽  
Cuo Nps ◽  
Uv Visible ◽  
Positively Charged

Abstract In this work, we reported the green synthesis of Solanum nigrum extract capped copper oxide nanoparticles (SN@CuO NPs) at room temperature, avoiding harsh, toxic, and environment unfriendly chemicals. The synthesized SN@CuO NPs, were analyzed with the help of spectroscopic techniques. UV-visible spectroscopy confirmed the synthesis of SN@CuO NPs in reaction mixture while fourier transform infrared spectroscopy (FTIR) results revealed capping of phytochemicals of Solanum nigrum over the surface of CuO NPs. Morphology and elemental composition of formed SN@CuO NPs were explored with the help of FE-SEM, TEM, and EDS, respectively. Crystalline nature, surface charge and specific surface area was characterized using XRD pattern, DLS and BET analyses, respectivley. The data obtained from spectroscopic analyses specified the formation of mesoporous, positively charged and highly stabilized CuO nanoparticles due to adsorption of phytochemicals present in Solanum nigrum leaf extract on the CuO nanoparticle’s surface. SN@CuO NPs have shown promising catalytic activity towards reduction of highly carcinogenic dye Congo red making use of sodium borohydride. Negatively charged reactants like anionic Congo red molecules and BH4− ions eagerly adsorbed on positively charged, small sizes (5–6 nm), mesoporous SN@CuO NPs surface having wide surface area. It is proposed that BH4− ions interacted with SN@CuO NPs to form Cu tetrahydroborates dihydrogen bonded (DHB) tetrahedral L2Cu(ɳ2-BH4) complex, which is proved as an effective reducing agent. This complex acts as dihydrogen source for rapid reduction of azo bond. UV-visible, FTIR, 1H NMR, 13C NMR, and LC-MS studies of reaction mixture at different reaction stages have shown that the major degradation intermediates were benzidine and α-naphthol. The apparent rate constants for the products at intermediate and final degradation stages have been found to be 0.468 min− 1 and 0.0189 min− 1, respectively. A plausible degradation mechanism for Congo red reduction has also been proposed in this study.

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