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Size and shape controlled synthesis of aqueous silver nanoparticles and a comparative study of their fluorescence and el

Size and shape controlled synthesis of aqueous silver nanoparticles and a comparative study of their fluorescence and el

Five samples of aqueous silver nanoparticles (samples A-E) were synthesized by reducing AgNO3 by NaBH4 in the presence of poly (vinyl pyrrolidone) (PVP) and sodium citrate. By varying the amount of the stabilizer PVP during synthesis process we get all the five samples of different morphology. We have characterized these samples by TEM, UV-Visible spectroscopy and fluorescence spectroscopy. The fluorescence and electrochemical interactions of these samples towards cholesterol have shown that all the samples behave differently towards cholesterol. By comparing their behaviors towards cholesterol it can be concluded that in future sample A whose fluorescence intensity (λex=250 nm; λemi= 220-500 nm; λmax = 341 nm) enhances 4.3 times of its initial value on interaction with cholesterol can be used as a good fluorescence probe and sample C whose redox potential suffers 148 mV –ve shift in presence of cholesterol can be used as a good electrochemical probe for the detection of cholesterol in solution.

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103 views • 8 slides
Synthesis, characterization and biological evaluation of novel binary and mixed ligand complexes of phosphonformic acid

Synthesis, characterization and biological evaluation of novel binary and mixed ligand complexes of phosphonformic acid

A new series of binary and mixed ligand complexesof Ni (II), Cu (II), and Zn (II) with phosphonoformic acid (PFA) a base ligand are studied. The structure of these complexes was identified and confirmed by elemental analysis, molar conductivity, FT-IR and magnetic susceptibility. PFA and their derivatives play an important role in biological processes. It is potential chelating agent and a very active in controlling HIV diseases. Complexes of transition metals ions Ni, Cu, and Zn with primary ligand PFA and secondary ligands (alanine, phenyl-alanine, ethylenediamine, 1, 10-penanthroline, oxalic acid and malonic acid) were carried out and tested for biological activity on Eleucine Coracana (ragi), anti-microbial activity on Staphylococcus-aureus, Bacillus subtilis, Escherichia coli and klebsiella pneumoniae.

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93 views • 7 slides

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