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Biogenic synthesis of Au and Ag nanoparticles using aqueous solutions of Black Tea leaf extracts.
- Source :
-
Colloids and surfaces. B, Biointerfaces [Colloids Surf B Biointerfaces] 2009 Jun 01; Vol. 71 (1), pp. 113-8. Date of Electronic Publication: 2009 Jan 21. - Publication Year :
- 2009
-
Abstract
- We explored the application of three different aqueous solutions derived from Black Tea leaf extracts in the synthesis of Au and Ag nanoparticles. The plain tea leaf broth, as well as that containing the ethyl acetate extract of tea leaves, were found to be extremely efficient, leading to rapid formation of stable nanoparticles of various shapes: spheres, trapezoids, prisms and rods. For a given metal ion precursor, the kinetics of particle synthesis were remarkably similar in these two solutions, as evidenced from their absorption spectroscopy monitored over time. Moreover, they exhibited similar redox behavior. In contrast, with the other solution, containing the dichloromethane (CH(2)Cl(2)) extract of tea leaves, we failed to detect any nanoparticle generation under similar reaction conditions. Our results suggest that the reduction of metal ions and stabilization of the resultant particles in the first two solutions involved the same class of biomolecules. We identified these biomolecules as the tea polyphenols, including flavonoids, which were present in comparable amounts in both the tea leaf broth and ethyl acetate extract, but are absent in the CH(2)Cl(2) extract of tea leaves. The efficiency of the tea leaf extracts towards Au and Ag nanoparticle synthesis were compared with that of a naturally occurring hydroxyflavonoid, quercetin.
- Subjects :
- Flavonoids chemistry
Methylene Chloride chemistry
Microscopy, Electron, Transmission
Phenols chemistry
Plant Extracts chemistry
Plant Leaves chemistry
Polyphenols
Spectroscopy, Fourier Transform Infrared
Camellia sinensis chemistry
Gold chemistry
Nanoparticles chemistry
Nanotechnology methods
Silver chemistry
Subjects
Details
- Language :
- English
- ISSN :
- 1873-4367
- Volume :
- 71
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Colloids and surfaces. B, Biointerfaces
- Publication Type :
- Academic Journal
- Accession number :
- 19250808
- Full Text :
- https://doi.org/10.1016/j.colsurfb.2009.01.012