Herbal infusions bioelectrochemical polyphenolic index: Green tea - The gallic acid interference

► In this study plants from nine botanical families were used. ► A laccase-based biosensor was used for quantification of phenolic compounds in samples. ► A strong correlation between BPI, TPC, and TAA was obtained for herbal infusion samples. ► When, a green tea sample was taken into account, a decrease in the correlation coefficients was observed. ► The green tea' matrix (gallic acid) affects the laccase-based biosensor response.