Development of an electrochemical sensor for the determination of the flavonoid luteolin in peanut hull samples

The linear range was from 2.4 × 10− 3 to 1.75 μmol L− 1. The luteolin contents determined in two peanut hull samples were (1.18 ± 0.08) and (1.47 ± 0.09) g per 100 g of sample, being in very good agreement with those values obtained from the same samples using HPLC. The limits of detection and quantification were 5.0 × 10− 10 and 1.5 × 10− 9 mol L− 1, respectively. The reproducibility and the repeatability were 8.0 and 7.3%, respectively. The modified glassy carbon electrode was stable even after 23 days.