Alkaline peroxidase activity of cupric oxide nanoparticles and its modulation by ammonia

The Analyst ◽  
2017 ◽  
Vol 142 (20) ◽  
pp. 3986-3992 ◽  
Author(s):  
Hao-Hua Deng ◽  
Xiao-Qing Zheng ◽  
Yan-Yu Wu ◽  
Xiao-Qiong Shi ◽  
Xiu-Ling Lin ◽  
...  
Keyword(s):  
Peroxidase Activity ◽  
Fluorescent Sensor ◽  
Cupric Oxide ◽  
Cuo Nanoparticles ◽  
Oxide Nanoparticles ◽  
Cupric Oxide Nanoparticles

Based on the ammonia-modulated alkaline peroxidase-like activity of CuO nanoparticles, a fluorescent sensor for urea and urease was developed.

Determination of tannic acid based on luminol chemiluminescence catalyzed by cupric oxide nanoparticles

2015 ◽  
Vol 7 (5) ◽  
pp. 1924-1928 ◽  
Author(s):  
Guang-Wen Li ◽  
Lei Hong ◽  
Meng-Sha Tong ◽  
Hao-Hua Deng ◽  
Xing-Hua Xia ◽  
...  
Keyword(s):  
Tannic Acid ◽  
Flow Injection ◽  
Cupric Oxide ◽  
Cuo Nanoparticles ◽  
Oxide Nanoparticles ◽  
Injection Method ◽  
Luminol Chemiluminescence ◽  
Cupric Oxide Nanoparticles ◽  
Acid Determination

Tannic acid was identified to inhibit the CL signal of CuO nanoparticles-catalyzed luminol–H2O2 system, and a flow injection method was developed for tannic acid determination.

scholarly journals A Low Cost Synthesis and Characterization of CuO Nanoparticles for Photovoltaic Applications

2019 ◽  
Vol 60 (1) ◽  
pp. 17-23
Author(s):  
A. A. Yankson ◽  
A. Kuditcher ◽  
G. Gebreyesus ◽  
M. N. Y. H. Egblewogbe ◽  
J. K. A. Amuzu ◽  
...  
Keyword(s):  
Particle Size ◽  
Size Distribution ◽  
Cupric Oxide ◽  
Low Cost ◽  
Cuo Nanoparticles ◽  
Oxide Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Photovoltaic Applications ◽  
Cupric Oxide Nanoparticles

A simple low cost chemical route has been used to synthesize cupric oxide nanoparticles. The synthesized CuO nanoparticles were characterized using XRD, TEM and UV-absorption. X-ray diffraction analysis showed the synthesized nanoparticles to be a pure cupric oxide. EDAX analysis showed the presence of copper and Oxygen in the as prepared CuO nano particles, with the AAS indicating that Cu2+ represented 53.5% of the sample. The particle size and particle size distribution of the cupric oxide nanoparticles were obtained by transmission electron microscopy (TEM) whereas the crystallite size and crystallite size distribution were obtained by X-ray diffraction. The particle size was found to be between 20 nm and 60 nm. The particle size distribution obtained from cumulative percentage frequency plots features a log-normal function. Absorbance measurements and analysis showed that the material has an absorbance peak at 314 nm and energy bandgap of 1.48 eV, making it a good candidate for photovoltaic applications.

Green synthesis, characterization, antibacterial and photocatalytic activity of black cupric oxide nanoparticles

2020 ◽  
Vol 9 (1) ◽  
Author(s):  
Khwaja Salahuddin Siddiqi ◽  
M. Rashid ◽  
A. Rahman ◽  
Tajuddin ◽  
Azamal Husen ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Ascorbic Acid ◽  
Leaf Extract ◽  
Cupric Oxide ◽  
Oxide Nanoparticles ◽  
Gram Positive ◽  
Gram Negative ◽  
Cuo Nps ◽  
Aqueous Leaf Extract ◽  
Cupric Oxide Nanoparticles

Abstract Background Biogenic fabrication of nanoparticles from naturally occurring biomaterials involves plants, herbs, bacteria and fungi using water as neutral solvent, while chemical synthesis involves hazardous chemicals and leaves unwanted byproduct which unnecessarily pollute the environment. In order to prevent atmospheric pollution a safe, clean and green strategy for the synthesis of cupric oxide nanoparticles from aqueous leaf extract of Diospyros montana has been employed. D. montana of Ebenaceae family is a poisonous tropical plant which grows wild in Asia. Its extract is commonly known as fish poison. The rate of formation of NPs from plant extract is thought to be facile and rapid relative to those formed by fungi and bacteria, but it depends on the concentration of reducing chemicals available in the extract. We report, in this communication, a benign method of biogenic synthesis of cupric oxide nanoparticles (CuO-NPs) from leaf extract of D. montana and their characterization by UV–visible, FTIR, SEM, TEM, DLS, SAED and EDX analyses. Their antimicrobial activity against seven Gram-positive and four Gram-negative bacteria has been screened. Photocatalytic degradation of methylene blue by ascorbic acid as reducing agent and cupric oxide nanoparticles as catalyst has been done under sunlight. Results Cupric oxide nanoparticles of varying size starting from 5.9 to 21.8 nm have been fabricated from aqueous leaf extract of D. montana at room temperature. The pure extract absorbs at 273 nm while CuO-NPs exhibit a broad peak at 320 nm. FTIR spectrum of the leaf extract shows the presence of a double quinonoid molecule. There are three types of CuO-NPs with different hydrodynamic radii. Their average hydrodynamic radii fall between 495 ± 346 nm. SEM and TEM images show spherical shaped CuO-NPs of different size. SAED suggests crystalline nature of CuO-NPs. They are highly polydispersed in solution. EDX analysis reveals the presence of Ca, C, O, Na and Si besides copper. Oxygen content is over 50% by mass. Reduction of methylene blue dye (MB) by ascorbic acid as reducing agent, in presence of CuO-NPs as catalyst, has been achieved in 90 s at room temperature while their reduction by ascorbic acid alone takes more than 10 min. Antibacterial activity of CuO-NPs against seven Gram-positive (Staphylococcus aureus, Streptococcus mutans, Streptococcus pyogenes, Streptococcus viridans, Staphylococcus epidermidis, Corynebacterium xerosis and Bacillus cereus) and four Gram-negative bacterial strains (Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa and Proteus vulgaris) has been investigated. The results indicated that NPs are highly effective against growth inhibition of Gram-positive bacteria than Gram-negative bacteria. Copper oxide nanoparticles are even more toxic than the standard antibiotic, norfloxacin. Conclusion In this project cupric oxide NPs of 5.9–21.8 nm have been fabricated from aqueous leaf extract of D. montana. It is most inexpensive and easy process to fabricate NPs from plant material because no toxic chemicals are used. Since CuO-NPs are toxic to several Gram-positive and Gram-negative bacterial strains, attempt may be made to use them as antibacterial agent to protect food, vegetable and crops. Also, the reduction of methylene blue dye by ascorbic acid as reducing agent in presence of CuO NPs as catalyst has been done very efficiently at a rapid rate which prompts us to use them as catalyst in the reduction of dyes, other toxic materials and industrial effluents. Further investigation of other beneficial properties of CuO-NPs can also be explored.

scholarly journals Determination of the bioaccessible fraction of cupric oxide nanoparticles in soils using an in vitro human digestibility simulation

2019 ◽  
Vol 6 (2) ◽  
pp. 432-443
Author(s):  
J. Vassallo ◽  
K. Tatsi ◽  
R. Boden ◽  
R. D. Handy
Keyword(s):  
Intestinal Absorption ◽  
Cupric Oxide ◽  
Oxide Nanoparticles ◽  
Human Intestinal Absorption ◽  
Bioaccessible Fraction ◽  
Cupric Oxide Nanoparticles

This study looks at the potential for ingested nanomaterials dosed in soil, to become bioaccessible for human intestinal absorption.

Optimisation of chemical oxygen demand removal from landfill leachate by sonocatalytic degradation in the presence of cupric oxide nanoparticles

2017 ◽  
Vol 35 (6) ◽  
pp. 636-646 ◽  
Author(s):  
Paria Amirian ◽  
Edris Bazrafshan ◽  
Abolfazl Payandeh
Keyword(s):  
Response Surface Methodology ◽  
Chemical Oxygen Demand ◽  
Response Surface ◽  
Landfill Leachate ◽  
Cupric Oxide ◽  
Oxygen Demand ◽  
Oxide Nanoparticles ◽  
Ultrasonic Frequency ◽  
Optimum Conditions ◽  
Cupric Oxide Nanoparticles

Leachate is the liquid formed when waste breaks down in the landfill and water filters through that waste. This liquid is very toxic and can pollute the land, ground water, and water resources. In most countries, it is mandatory for landfills to be protected against leachate. In addition to all other harms to the environment, disposal of raw landfill leachate can be a major source of hazard to closed water bodies. Hence, treatment of landfill leachate is considered an essential step prior to its discharge from source. This article describes the sonocatalytic degradation of chemical oxygen demand in landfill leachate using cupric oxide nanoparticles as sonocatalyst (cupric oxide/ultrasonic) and aims to establish this method as an effective alternative to currently used approaches. An ideal experimental design was carried out based on a central composite design with response surface methodology. The response surface methodology was used to evaluate the effect of process variables including pH values (3, 7, 11), cupric oxide nanoparticles dose (0.02, 0.035, 0.05 g), reaction time (10, 35, 60 minutes), ultrasonic frequency (35, 37, 130 KHz), and their interaction towards the attainment of their optimum conditions. The derived second-order model, including both significant linear and quadratic terms, seemed to be adequate in predicting responses (R2 = 0.9684 and prediction R2 = 0.9581). The optimum conditions for the maximum chemical oxygen demand sonocatalytic degradation of 85.82% were found to be pH 6.9, cupric oxide nanoparticles dosage of 0.05 gr L−1, and the ultrasonic frequency of 130 kHz at a contact time of 10 min.

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