Work from the Chen group at Shanghai University published in Microchimica Acta described the development of a surface plasmon resonance (SPR) sensor using pyridinium porphyrin-mediated gold nanoparticle composites to amplify SPR signal when detecting B-type natriuretic peptide (BNP). The determination range for the sensor was shown to be broad and the experimental execution simple and easily performed. Thanks for using our Fe(III) meso-Tetra (N-Methyl-4-Pyridyl) porphine pentachloride, T40322.