Banana peel derived biomass carbon: Multi‐walled carbon nanotube composite modified electrode for sensitive voltammetric detection of baicalein

Abstract In this study, a novel electrochemical sensor was developed for the detection of baicalein based on multi‐walled carbon nanotube (MWCNT) and banana peel derived biomass carbon (BPBC) composite modified glassy carbon electrode (GCE). The BPBC was synthesized by carbonization and alkali activation method using commonly available banana peel as the raw material, which was further mixed with MWCNT to obtain BPBC‐MWCNT composite. Then the composite modified GCE was fabricated and used for voltammetric detection of baicalein with a wide detection range from 0.0040 to 100.0 μM as well as a low detection limit of 1.33 nM (3 σ / S ). Also, the electrochemical behaviors of baicalein on BPBC‐MWCNT/GCE were investigated by cyclic voltammetry in detail. The proposed method was applied to the detection of baicalein content in Shuanghuanglian oral liquid with satisfactory results. Therefore, this work extended the electrochemical method for the drug analysis by using biomass‐derived carbon‐based composite.