| abstract |
Provided is a method for assaying a substance, which method comprises contacting the substance with an assay agent comprising a catalytic agent to associate the substance with the catalytic agent, contacting the resulting associated substance with a label precursor, and detecting a label, wherein the label precursor is capable of reacting catalytically with the catalytic agent to release the label, and wherein the label is a mass label. Also provided is a kit for assaying a substance, which kit comprises an assay agent comprising a catalytic agent, and a label precursor capable of reacting catalytically with the catalytic agent to release a label, wherein the label is a mass label. |