The intestinal absorption of an intact oligopeptide was investigated in rats using a synthetic cationic peptide, 001-C8 (H-MeTyr-Arg-MeArg-d-Leu-NH (CH2) 8NH2). The peptide was coupled with 4-nitrobenzo-2-oxa-1, 3-diazole (NBD) to prepare a fluorescence-labeled derivative 001-C8-NBD (H-MeTyr-Arg-MeArg-d-Leu-NH (CH2) 8NH-NBD) for the purpose of quantification. The degradation half-life of 001-C8-NBD in jejunal homogenate (1mg/mL) ...
[Squire, Jennifer S.; Sutti, Alessandra; Durand, Gregory; Conlan, Xavier A.; Henderson, Luke C. New Journal of Chemistry, 2013 , vol. 37, # 7 p. 1895 - 1905]