“…In addition, an abnormally high level of ONOO − is also related to many diseases, such as neurodegenerative diseases, 8,9 inflammatory infections, 10,11 liver injury diseases, 12,13 and even cancer, 14 as well as influencing the endoplasmic reticulum viscosity. 15,16 At present, several methods for detecting ONOO − have been reported, such as near-infrared spectroscopy, 17,18 high-performance liquid chromatography, 19 chemiluminescence, 20 fluorescence spectroscopy, [21][22][23] ultraviolet-visible absorption spectroscopy, 24 electron spin resonance 25,26 and electrochemistry. 27,28 Although there have been a few reports on SERS methods for detecting intracellular ONOO − , 29 the reasons of ONOO − causing organisms lesions have not well explained yet.…”