Biosynthesis of copper nanoparticles from plant extract and bacteria - a review

2021 ◽  
Vol 13 (3) ◽  
pp. 135
Author(s):  
Ravindra Ashok Sharma
Author(s):  
Srijan Sunar ◽  
Rajeshkumar S ◽  
Anitha Roy ◽  
Lakshmi T

Copper nanoparticles makes important progress in the area of nanotechnology and nanomedicine due to their good optical, electrical and anti-fungal/bacterial application. It is prepared using some methods such as vacuum vapour deposition, microwave irradiation methods, chemical reduction and laser ablation. The chemical reduction method is simple, inexpensive and gives a liable control of geometrical nanoparticle characteristics like size and shape. 20 millimolar of 80 ml copper sulphate prepared using double distilled water. The plant extract is added with the metal solution and was made into 100 ml solution. The synthesised nanoparticles solution is preliminarily characterized by using UV- vis-spectroscopy, 3ml of the solution is taken in curette and scanned in double beam UV-vis- spectrophotometer from 300 nm to 700 nm wavelength. The agar well diffusion method is used. Different concentration of Cu NPs was tested against Staphylococcus aureus, Streptococcus mutans (gram +), Enterococcus sp and Pseudomonas sp. The result reveals that Moringa Oleifera mediated with copper nanoparticles show effective antibacterial activity. CuNPs ex significantly higher activity with an increase in the zone of inhibition diameter. The plant extract is observed to be dark green, and the copper nanoparticles are seen to be in light greenish in colour. They can be used in toothpaste and oral medicines due to their antibacterial activity. Nanoparticles are expected to be used in future for the effective drug systems and immunity against diseases.


2020 ◽  
Author(s):  
Rajagopal Ramkumar ◽  
Shradha Sapru ◽  
Panthalattu Parambil Archana

<div>An extract of <i>Aloe Vera</i> acts as a powerful reducing agent for the synthesis of ultrasmall copper nanoparticles (CuNPs) in water medium. The prepared copper nanoparticles are characterized by XRD, HRTEM and UV-Vis analysis. The diameter of the prepared nanoparticle is less than 5 nm. The catalytic activity of CuNPs has been successfully evaluated for the three-component reaction to synthesize 1,2,3-triazoles and chalcone tethered 1,2,3-triazoles with low catalyst loading and under mild reaction conditions. These triazoles are further utilized for the synthesis of dihydropyrazines.</div>


Author(s):  
Mahmood Ali Abed Al-Khafaji ◽  
Rana A.K. Al-Refai'a ◽  
Oda Mizil Yasser Al-Zamely

2020 ◽  
Author(s):  
Rajagopal Ramkumar ◽  
Shradha Sapru ◽  
Panthalattu Parambil Archana

<div>An extract of <i>Aloe Vera</i> acts as a powerful reducing agent for the synthesis of ultrasmall copper nanoparticles (CuNPs) in water medium. The prepared copper nanoparticles are characterized by XRD, HRTEM and UV-Vis analysis. The diameter of the prepared nanoparticle is less than 5 nm. The catalytic activity of CuNPs has been successfully evaluated for the three-component reaction to synthesize 1,2,3-triazoles and chalcone tethered 1,2,3-triazoles with low catalyst loading and under mild reaction conditions. These triazoles are further utilized for the synthesis of dihydropyrazines.</div>


2020 ◽  
Vol 9 (1) ◽  

In the modern scientific era, nanotechnology isone of the burning field for researchers and scientists because of their applications in a number of areas. The synthesis of nanoparticles (particles having size 1-100 nm) is also the centre of attraction towards researchers due to its unique chemical and physical properties and wide applications. Nanoparticles can be synthesized by physical, chemical and biological processes also known as green synthesis. Among all of the methods of nanoparticles synthesis, green synthesis is non-toxic, economic and eco-friendly and also applicable to in numerous fields such as medicinal chemistry, catalysis etc. In the present study, we investigate the potential of the extract of plant dicliptera roxburghiana towards the synthesis of copper nanoparticles, for which a fixed ratio of plant extract and CuSO4 solution was used. The synthesis of Cu-NPs was initially confirmed by colour change of CuSO4 from blue to brownish green. The synthesized copper nanoparticles were studied and characterized by XRD, FT-IR and UV-Visible spectroscopy and later on subjected towards the photocatalytic degradation of organic dye methylene blue. Surface Plasmon Resonance of Cu-NPs was found to be at 578 nm using UV-Visible analysis and characteristic peak at 517-519 nm of copper nanoparticles were given by FT-IR spectrometer while XRD analysis showed the spherical shape of Cu-NPs having size of 58 nm. The photocatalytic activity of Cu-NPs was also studied in a comparison manner between the Cu-NPs in dried form and Cu-NPs in plant extract solution against methylene blue under sunlight.


Author(s):  
S. Rajeshkumar ◽  
Soumya Menon ◽  
S. Venkat Kumar ◽  
Murtaza M. Tambuwala ◽  
Hamid A. Bakshi ◽  
...  

Planta Medica ◽  
2016 ◽  
Vol 81 (S 01) ◽  
pp. S1-S381
Author(s):  
LS Espindola ◽  
RG Dusi ◽  
KR Gustafson ◽  
J McMahon ◽  
JA Beutler

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