Abstract

Methods and devices for detecting a target enzyme include an anchored or trapped peptide complex. The peptide complex includes an anchor particle immobilized on a sample analysis device or trapped in a reaction receptacle including a filter, a peptide, with at least one enzyme cleavage site for a target enzyme, bound to the anchor particle, at least one detectable label, and at least one first tag bound to the peptide on a side of the enzyme cleavage site opposite the anchor particle. When the target enzyme is present in the sample, the enzyme cleaves the peptide at the enzyme cleavage site, permitting the cleaved peptide to reach the test zone of a sample analysis device such that the first tag binds to the immobilized second tag and a signal is detected at the test zone.