“…9 In the past few years, various methods have been developed for the quantitative analysis of MAO-B on the basis of enzyme-catalyzed products, such as high-performance liquid chromatography-diode array detection (HPLC-DAD), spectrophotometry, fluorescence, electrochemistry, surface enhanced Raman scattering (SERS) and chemiluminescence (CL). 10–16 However, these traditional methods require a large number of samples or cumbersome detection process. Therefore, developing a label-free and sensitive strategy to monitor MAO-B activity is of great significance for the diagnosis and treatment of neurodegenerative diseases.…”