Biosynthesis of silver nanoparticles using Lannea coromandelica bark extract: A comparative study with Polyvinyl alcohol (PVA) and Polyacrylic acid (PAA) as stabilizing agents

Lannea coromandelica bark is one of the plants that has many functions as traditional medicine, especially its bark. This plant contains chemical compounds such as dihydroflavonols, reducing sugars, alkaloids, steroids, terpenoids, tannins, carbohydrates and flavonoids. These chemical compounds have the potential as bioreductants in the synthesis of silver nanoparticles (AgNPs). In this study, the biosynthesis and characterization of AgNPs was carried out using Lannea coromandelica bark extract, as well as a comparing the use of Polyvinyl alcohol (PVA) and polyacrylate acid (PAA) as stabilizers. The results showed that qualitatively the silver nanoparticles formed based on UV-Vis spectroscopy measurements obtained a maximum wavelength of 445 nm and an absorbance of 1.631. While the maximum wavelength for AgNP-PVA and AgNP-PAA were 446 nm (absorbance 1.856) and 459 nm (absorbance 0.860), respectively. XRD analysis showed that the nanoparticles produced were pure silver nanoparticles sized 39.86 nm. Furthermore, FTIR analysis showed a change in wavenumber from 3442 cm−1 to 3414 cm−1, indicating an interaction between the O-H group and Ag. The other IR band also changes from 1620 cm−1 to 1611 cm−1 in the C=O group.