Transition metal porphyrin complexes immobilized on glassy carbon electrode surfaces were demonstrated by Peng, et al., to act as electrochemical sensors for the detection of hydrogen peroxide and glucose. Mn(III) meso-Tetra (N-methyl-4-pyridyl) porphine pentachloride, catalog number T40809 was found to have the lowest detection limits for hydrogen peroxide and glucose in human serum, demonstrating the systems efficacy in complex biological media.