For the synthesis of silver nanoparticle, a natural polysaccharide;
guar gum (GG) is used as a substrate which act as stabilizing
and capping agent. 2.5% (w/v) of GG substrate was dissolved in
10 ml distilled water with the help of magnetic stirrer. The main
significance about our synthesis is that we do not require maintaining
the pH during the synthesis process. The synthesis takes
place at solution pH which is 6. After complete dissolution, the temperature
of the reaction medium is raised to 70 ◦C. Now 10 ml of
15 mM silver nitrate solution was then added drop wise. The reaction
mixture was kept under continuous stirring for 90 min. Short
time after addition of silver nitrate, the reaction medium acquires a
clear yellow brown color showing the formation of silver nanoparticles.
The progression of the reaction was controlled by recording
UV–vis absorption at given time intervals and evaluated