Description_x000D_ Application_x000D_ L-Leucine-p-nitroanilide has been used as substrate_x000D_ • for the determination of intestinal leucine aminopeptidase activity of juvenile rainbow trout (Oncorhynchus mykiss)_x000D_ • in insulin-regulated aminopeptidase inhibition assay_x000D_ • for determining exopeptidase activity_x000D_ Packaging_x000D_ 1, 5 g in poly bottle_x000D_ 250, 500 mg in poly bottle_x000D_ Substrates_x000D_ Substrate for the colorimetric determination of leucine aminopeptidase.