Biosynthesis of Copper Nanoparticles by using Aloe Barbadensis Leaf Extracts

The copper nanoparticles were synthesized by green technology using leaf extracts of Ocimum sanctum. The synthesized copper nanoparticles were confirmed by the change of colour after the addition of leaf extract into the copper sulfate solution. The synthesized copper was characterized by X-ray Diffraction (XRD), transmission electron microscopy (TEM) and UV-vis absorption spectroscopy. The copper nanoparticles are crystallized with FCC structure. The synthesized copper nanoparticles exhibit spherical morphology with average particle size of 20 nm. The copper nanoparticle exhibits absorption broad band between 550 nm – 575 nm. The optical trapping effect of Gaussian beam acting on a copper nanoparticle in Rayleigh regime was studied. The optical scattering and optical gradient forces were calculated for 20 nm copper particle.

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Biosynthesis Copper Nanoparticles using Blumea balsamifera Leaf Extracts: Characterization of its Antioxidant and Cytotoxicity Activities

Surfaces and Interfaces ◽

10.1016/j.surfin.2020.100799 ◽

2020 ◽

Vol 21 ◽

pp. 100799

Author(s):

Binawati Ginting ◽

Ilham Maulana ◽

Ida Karnila

Keyword(s):

Copper Nanoparticles ◽

Leaf Extracts ◽

Cytotoxicity Activities

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Antimicrobial, Antioxidant and Cytotoxic Activity of Green Synthesized Copper Nanoparticle of Parthenium Hysterophorus L.

INTERNATIONAL JOURNAL OF MULTIDISCIPLINARY RESEARCH AND ANALYSIS ◽

10.47191/ijmra/v4-i2-01 ◽

2021 ◽

Vol 04 (02) ◽

Author(s):

Archana Rai ◽

Keyword(s):

Copper Nanoparticles ◽

Leaf Extract ◽

Antimicrobial Agents ◽

Antioxidant Activities ◽

Biological Activities ◽

Parthenium Hysterophorus ◽

Leaf Extracts ◽

Synthesis Of Nanoparticles ◽

Viability Assay ◽

Nanoparticles Synthesis

Natural products are valuable and well known for their biological activities. In the current scenario, the research and analysis of plant leaf extract and nanoparticles synthesis with their biological activities has been expended significantly. For the synthesis of nanoparticles, Copper is the preferred metal among other metals due to its reported use in medical field as antimicrobial agents and its lethality. The aim of the present work is to assess antimicrobial and antioxidant activities of the methanolic leaf extracts and aqueous leaf extract mediated copper nanoparticles of Parthenium hysterophorus. Study also revealed the comparative analysis between methanolic leaf extracts and copper nanoparticles. Synthesis of copper nanoparticles (CuNPs) was confirmed by the change of color of aqueous extract, which were further confirmed by using UV-Vis spectrophotometer. The results indicated that copper nanoparticles have great antimicrobial activity against Bacillus subtilis, Staphylococcus aureus, Candida albicans and Aspergillus flavus rather than methanolic leaf extract. These studies confirmed that copper nanoparticles are capable to rendering high antimicrobial efficacy and hence has a great potential in the development of antimicrobial agents. Based on the DPPH, copper nanoparticles found to be good antioxidant when compared to methanolic leaf extract. Furthermore cells viability assay was also done against copper nanoparticles. These results concluded that copper nanoparticles are good source of therapeutic agent and applications of copper nanoparticles based on these findings may lead to valuable discoveries in various fields such as medical devices and antimicrobial systems.

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Green synthesis of silver nanoparticles and evaluation of their anti-bacterial activities: use of Aloe barbadensis miller and Ocimum tenuiflorum leaf extracts

Nanofabrication ◽

10.1515/nanofab-2020-0102 ◽

2021 ◽

Vol 6 (1) ◽

pp. 52-67

Author(s):

Saurabh Sharma ◽

Kuldeep Kumar ◽

Naveen Thakur

Keyword(s):

Green Synthesis ◽

Ag Nanoparticles ◽

Heating Temperature ◽

Leaf Extracts ◽

Aloe Barbadensis ◽

Stirring Time ◽

Ocimum Tenuiflorum ◽

The Stability ◽

Constant Heating ◽

Synthesis Approach

Abstract The presence of various phytochemicals makes the leaf extract-based green synthesis advantageous to other conventional methods, as it facilitates the production of non-toxic by-product. In the present study, leaf extracts from two different plants: Aloe barbadensis miller and Ocimum tenuiflorum, were used to synthesise Ag nanoparticles. The absorbance at 419-432 nm from UV-visible spectroscopy indicates the formation of Ag in the synthesised samples. The effect of precursors’ concentration on the stability, size and shape of the synthesised samples has also been investigated at constant heating temperature, stirring time, and the pH of the solution. The TEM results showed that all the synthesised samples of nanoparticles demonstrated stability with a size range of 7-70 and 9-48 nm with Aloe barbadensis miller and Ocimum tenuiflorum leaf extracts, respectively. The formation of smaller Ag nanoparticles due to utilisation of different precursor concentration and leaf extracts was also explained. The synthesised samples’ anti-bacterial activity was examined against the pathogens, Bacillus subtilis, Staphylococcus aureus, and Escherichia coli. In general, the green synthesis approach established a prospective for developing highly stable Ag nanoparticles with rigid particle shape/size distribution from different leaf extracts for the development of better anti-bacterial agents.

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