Sintesis dan Karakterisasi Nanopartikel Perak Ekstrak Limbah Kulit Buah Kopi (Coffea canephora)

Abstract

Background: Silver nanoparticles hold immense promise for various applications in the medical field, particularly in pharmaceuticals as antibacterial agents. Coffee fruit peel waste is an abundant by-product of the coffee industry that poses a potential environmental threat. This waste is rich in bioactive compounds that can be utilized for the eco-friendly synthesis of silver nanoparticles (AgNPs). Objective: This study aims to synthesize Silver Nanoparticles using coffee fruit peel waste extract as a reducing agent and characterize their properties. Methods: Coffee fruit peel waste was extracted using the decoction method to obtain the extract. AgNO3 solution was added to the coffee fruit peel waste extract and stirred for 15 minutes at room temperature. Microwave irradiation was then carried out for 1 minute in 3 cycles. Silver nanoparticles synthesis was monitored using UV-Vis spectroscopy. Characterization of silver nanoparticles was performed using UV-Vis spectrophotometry, Particle Size Analyzer (PSA), Scanning Electron Microscope (SEM), and Fourier-Transform Infrared Spectroscopy (FTIR). Results: The synthesis of silver nanoparticles using coffee fruit peel waste extract as a reducing agent was successful. The silver nanoparticles exhibited an average size of 147.08 nm and were well-dispersed. FTIR analysis revealed the presence of functional groups involved in the synthesis and stabilization of silver nanoparticles. SEM was expected to confirm the spherical morphology of silver nanoparticles, however, the results were inconclusive. UV-Vis spectrophotometry indicated the maximum absorption of silver nanoparticles at λ 420 nm, signifying their characteristic optical properties. Conclusion: Coffee fruit peel waste can be effectively utilized for the synthesis of silver nanoparticles with desired properties. This synthesis method is environmentally friendly and opens up new avenues for the valorization of coffee fruit peel waste.