Voltammetric determination of lactic acid in milk samples using carbon paste electrode modified with chitosan-based magnetic molecularly imprinted polymer

A carbon paste electrode, modified with chitosan-based magnetic molecularly imprinted polymer (CS-MIP), was utilized as a highly sensitive electrochemical sensor for the determination of lactic acid (LA) in spoilage milk samples. The electrochemical measurements were indirectly performed by cyclic voltammetry and differential pulse voltammetry in the presence of K-3[Fe(CN)(6)] as a redox probe. A decrease in the faradic current of the redox probe was imputed to the gate effect mechanism, which was related to electrical effects causing to disrupt the electronic transport pathway. The linear response ranges were 0.01-10.0 mu M and 10.0-500.0 mu M, and the detection limit was 0.005 mu M. The electrochemical sensor was used for the determination of lactic acid in real milk samples with satisfactory results. [GRAPHICS] .

Automated summary

A carbon paste electrode modified with CS-MIP was used as a highly sensitive electrochemical sensor for the determination of lactic acid in spoilage milk samples. The electrochemical measurements were indirectly performed by cyclic voltammetry and differential pulse voltammetry, demonstrating good detection performance under experimental conditions for the determination of lactic acid in real milk samples.