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@@ Enzyme-linked immunosorbent assay(ELISA) usually tolerates a nalTOW range to quantify an analyte of interest.In routine practice。activities of enzymes as labels in ELISA ale exclusively measured by the classical initial rate method using synthetic chromogenic substrates.Due to potential interference from contaminants in these chromogenic substrates,their cost and potential substrate.inhibition.practical substrate levels are always lower than those for saturating enzyme labels in ELISA.Therefore,ELISA inherently has a narrow quantifiable range of an analyte of interest.