An electroanalytical lab-on-a-strip device for the direct extra-virgin olive oil (EVOO) antioxidant capacity evaluation is proposed. The lab-made device is composed of a CO2 laser nanodecorated sensor combined with a cutter-plotter molded paper-strip designed for EVOOs sampling and extraction. Satisfactory performance towards the most representative o-diphenols of EVOOs i.e., hydroxytyrosol (HY) and oleuropein (OL) were achieved; good sensitivity (LODHY = 2 mu M; LODOL = 0.6 mu M), extended linear ranges (HY: 10-250 mu M; OL: 2.5-50 mu M) and outstanding reproducibility (RSD < 5%, n = 3) were obtained in rectified oil. The device was challenged for the extraction-free analysis of 15 different EVOO samples, with satisfactory recoveries (90-94%; RSD < 5%, n = 3) and correlation with classical photometric assays (r >= 0.91). The proposed device includes all analysis steps, needs 4 mu L of sample, and returns reliable results in 2 min, resulting portable and usable with a smartphone.

Rapid pretreatment-free evaluation of antioxidant capacity in extra virgin olive oil using a laser-nanodecorated electrochemical lab-on-strip

Silveri F.;Scroccarello A.;Della Pelle F.
;
Del Carlo M.;Compagnone D.
2023-01-01

Abstract

An electroanalytical lab-on-a-strip device for the direct extra-virgin olive oil (EVOO) antioxidant capacity evaluation is proposed. The lab-made device is composed of a CO2 laser nanodecorated sensor combined with a cutter-plotter molded paper-strip designed for EVOOs sampling and extraction. Satisfactory performance towards the most representative o-diphenols of EVOOs i.e., hydroxytyrosol (HY) and oleuropein (OL) were achieved; good sensitivity (LODHY = 2 mu M; LODOL = 0.6 mu M), extended linear ranges (HY: 10-250 mu M; OL: 2.5-50 mu M) and outstanding reproducibility (RSD < 5%, n = 3) were obtained in rectified oil. The device was challenged for the extraction-free analysis of 15 different EVOO samples, with satisfactory recoveries (90-94%; RSD < 5%, n = 3) and correlation with classical photometric assays (r >= 0.91). The proposed device includes all analysis steps, needs 4 mu L of sample, and returns reliable results in 2 min, resulting portable and usable with a smartphone.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11575/130678
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