1.
Anal Chem
; 88(10): 5145-51, 2016 05 17.
Article
in English
| MEDLINE
| ID: mdl-27103080
ABSTRACT
We report the development of a simple, portable, low-cost, high-throughput visual colorimetric paper-based analytical device for the detection of procaine in seized cocaine samples. The interference of most common cutting agents found in cocaine samples was verified, and a novel electrochemical approach was used for sample pretreatment in order to increase the selectivity. Under the optimized experimental conditions, a linear analytical curve was obtained for procaine concentrations ranging from 5 to 60 µmol L(-1), with a detection limit of 0.9 µmol L(-1). The accuracy of the proposed method was evaluated using seized cocaine samples and an addition and recovery protocol.