Betanin assisted synthesis of betanin@silver nanoparticles and their enhanced adsorption and biological activities.

Authors :: Kosa SA
Zaheer Z
Source :: Food chemistry [Food Chem] 2019 Nov 15; Vol. 298, pp. 125014. Date of Electronic Publication: 2019 Jun 22.
Publication Year :: 2019
Abstract: Natural red purple dye, Betanin, was extracted from the beetroot, purified by aqueous two- phase extraction and gel permeation column chromatography, and used as a reducing agent for the synthesis of silver-betanin core-shell triangular nanodisks for the first time. Spectroscopic data show that the nanoparticle structure is core@shell like with Ag as core and betanin as shell. Langmuir monolayer model (q <subscript>m</subscript>  = 32.4 mg/g, R <subscript>L</subscript>  = 0.99 and R <superscript>2</superscript>  = 0.997) was the best fit adsorption isotherm for the dye removal. Adsorption kinetics is well explained by pseudo-second-order equation. Gibbs free energy (ΔG <superscript>0</superscript>  = -2.59 kJ mol <superscript>-1</superscript> ), enthalpy (ΔH <superscript>0</superscript>  = 18.05 kJ mol <superscript>-1</superscript> ), and entropy (ΔS <superscript>0</superscript>  = 68.92 J/K/mol) were calculated and discussed. The antibacterial activity of betanin-AgNPs were determined against Escherichia coli MTCC-450 (E. coli) and Staphylococcus aureus MTCC-3160 (S. aureus) bacteria.<br /> (Copyright © 2019 Elsevier Ltd. All rights reserved.)

Subjects :: Adsorption
Anti-Bacterial Agents chemistry
Betacyanins chemistry
Betacyanins isolation & purification
Coloring Agents chemistry
Coloring Agents isolation & purification
Entropy
Escherichia coli drug effects
Kinetics
Staphylococcus aureus drug effects
Thermodynamics
Anti-Bacterial Agents pharmacology
Beta vulgaris chemistry
Betacyanins pharmacology
Coloring Agents pharmacology
Metal Nanoparticles chemistry
Silver chemistry

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