Abstract:
Bioactive chemicals in Rhizopora mucronata barks can be exploited in the production of
silver nanoparticles. This research aims to ultilize aqueous Rhizopora mucronata bark
extract in the preparation of silver nanoparticles, the optimum pH in the silver
nanoparticle synthesis step will be determined and characterized. The bioactive
chemical predicted to work as reducing agent that will reduce Ag+ to Ag0. The silver
nanoparticles synthesized were carried out using 9 mL AgNO3 in 1 mM concentration
added 1 mL extract and then incubated for 25 minutes in the optimum pH. The results
showed that a optimum pH for the silver nanoparticles synthesized using aqueous
extract of Rhizopora mucronata bark is pH 9. Based on UV-Vis spectrum, the peak was
shown at 422 nm with 1.866 of absorbance. Alkaloids, tannins and saponins compounds
are secondary metabolite that interact as reducing agents in Rhizopora mucronata barks.
X-Ray Difraction (XRD) analysis showed that the silver nanoparticles resulted were
crystalin and detected with Face Centered Cubic (FCC), average size 23.33 nm and
Scanning Electron Microscopy (SEM) analysis showed the surface morphology has
cubes shape with homogen distribution and size of area surface in average of 21 nm. It
can be concluded that aqueous extract of Rhizopora mucronata bark are potentially used
in silver nanoparticles synthesis at optimum pH 9.
