3.3. Effect of BPE
The reaction mixtures containing 0.25, 0.5, and 0.75 ml of BPE
developed a light reddish brown color, while those containing
1.0 up to 3.0 ml of BPE developed darker reddish brown color.
The SPR peaks were proportionally more intense and the
maximum peak intensity was observed at BPE content of
3.0 ml (Fig. 1c). When the concentration of the biological material
mediating nanoparticle synthesis is increased, higher
contents of the biomolecules involved in the metal reductive
process are available resulting in a more intense color. Such
an effect has been reported with the bark extract of Cinnamon
zeylanicum (Satishkumar et al., 2009) and with the leaves of
Cinnamon camphora (Huang et al., 2007).