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Abstract
The determination of minoxidil (MX) with potassium permanganate as a carrier in a flow injection method is described. The detection at 550 nm was linear from 1.0 × 10−5 to 5.0 × 10−4 mol L−1. The limit of detection (3σ/slope) was 8.92 × 10−6 mol L−1, with an analytical frequency of 32 h−1. The proposed method was applied to commercial samples, with recoveries from 104.7 to 106.4%. Comparison with the HPLC procedure reveled relative errors from 0.48 to 1.4%, and the results agreed within a 95% confidence level.
Acknowledgments
This paper was submitted as part of a Special Issue on Flow Injection Analysis.
The authors are grateful to FAPESP (Proc n° 08/03537-7), for financial support and Programa PROCONTES/USP for PC support.
Notes
A = reactor; B = sample loop; C = flow rate.
a = mg mL−1 ± Standard deviation, n = 10.
b = |Relative Error| = [(FIA – HPLC)/HPLC] ∗100%.