Determination of ascorbic acid based on Gold nanoparticles-L-alanine/GCE

摘要

A Gold nanoparticles-L-alanine modified glass electrode has been successfully fabricated by using layer-by-layer self-assembly technology and used for determination of ascorbic acid. First, the clean electrode was immersed into L-Alanine solution to acquire a L-Alanine film on the surface of GCE and dried at room temperature, then the gold colloid was dipped onto the L-Alanine film. The electrochemical behaviors of ascorbic acid at the modified electrode were investigated by cyclic voltammetry and current-time techniques. The results showed that the sensor produced high sensitivity and good stability to ascorbic acid and the current was linear with the concentration of ascorbic acid in the range of 1.20×10~(-5) to 1.60×10~(-4) mol/L with a detection limit of 1.00× 10~(-5) mol/L.