In a typical reaction procedure, 5ml of seed extract was added
to 20 ml of 10−3(M) aqueous silver nitrate solution, the mixturewas
heated at 80 ◦C and the resulting solution became reddish in colour
after 15min of heating. UV–vis spectra showed strong SPR band
at 425nm and thus indicating the formation of silver nanoparticles.
Colour intensity increases with the increase of silver nitrate
concentrations at a fixed volume fraction (f = 0.2) of seed extract