Chemical fecal occult blood testing uses the peroxidase-like activity of heme in hemoglobin to oxidize chromogenic substrates in the presence of peroxide, thereby indirectly determining whether trace blood components are present in feces.
Nanozymes refer to nanomaterials with catalytic activities similar to natural enzymes. Under specific reaction conditions, they can mimic enzymatic functions such as peroxidase, oxidase, catalase and superoxide dismutase.