Fig. 3From: Three techniques for the determination of perindopril through derivatization with 4-chloro-7-nitrobenzo-2-oxa-1,3-diazoleAbsorption spectra of: A PRD only (40.0 μg mL−1). B blank NBD-Cl (0.2%; pH 9.0). C PRD reaction product(40.0 μg mL−1), with NBD-Cl (0.2%;pH 9.0)Back to article page