The electrochemical catalytic behavior of pyrogallol at an 8-hydroxyquinoline-aluminum complex modified carbon paste electrode and its detection in tomato

Abstract

Tomato (Solanum lycopersicum) fruit is an excellent food for promoting human health and wellbeing due to its containing polyphenols as antioxidants. Pyrogallol among the polyphenols is a very important chemical reagent to be used in detection of peroxidase activity with auto-oxidation behavior. A simple cyclic voltammetric method for determination of pyrogallol in tomato has been developed based on the 8-hydroxyquinoline-aluminum complex modified carbon paste electrode with microextraction and electrochemical catalytic behavior. The amount of pyrogallol in tomato is about 2.8 mg/100 g and recovery is about 84.4%. The standard addition recovery is not stable, with the decrease with time due to the existence of peroxidases in the tomato suspension solution and oxygen from air, which follows a first order reaction with an apparent first order reaction constant of 0.0852 min⁻¹.