Abstract:
The aim of this study was to determine the ability of Alpinia galanga aqueous extract as
reducing agent for the synthesis of silver nanoparticles. AgNO3 10-3 M solution was
reduced using the extract at room temperature by stirring for various ratio of extract and
AgNO3 10-3 M solution. Color changing of the solution was detected at 9 hours reaction
time. The color tends to be darker by the the increasing of reaction time. The formation
of silver nanoparticles was confirmed by doing characterization using UV-Vis
spectrophotometer. Nanoparticles were detected in the wavelength range of 430-450 nm.
Antibacterial activity of silver nanoparticles produced was determined for the ratio of 1:5
at a reaction time of 19 hours for silver nanoparticles from Alpinia galanga. Antibacterial
activity was performed against Staphylococcus epidermidis and Pseudomonas
aeruginosa. The results showed that silver nanoparticles of Alpinia galanga was active
against Pseudomonas aeruginosa. Silver nanoparticles solutions were more active in
inhibiting the growth of bacteria tested than aqueous extract of Alpinia galanga.
