Synthesis of silver nanoparticles using tyrosine as reductor and capping agent

Synthesis and stability of silver nanoparticles (AgNPs) using tyrosine as a reducing and capping agent have been done. Synthesis of AgNPs was performed by mixing silver nitrate (AgNO3) solution as a precursor with tyrosine amino acid and heating it in a boiling water bath until characterized by the appearance of color change from colorless to yellow. Variations in pH, concentration, and reaction time affecting the formation of AgNPs were studied using UV-Vis spectrophotometry in the wavelength range of 300-700 nm as the main device. The synthesis was successfully conducted at pH 11 for 45 min with the optimum tyrosine concentration was 3 mM for 0.5 mM AgNO3. The optimum mole ratio AgNO3 0.5 mM to tyrosine 3 mM was 1:6. TEM and PSA characterizations showed that the particle was a round shape and 29.5 nm is average size, respectively. © 2020 Trans Tech Publications Ltd, Switzerland.