Ratiometric electrochemical sensor based on polythionine/multiwalled carbon nanotube composite for butylated hydroxyanisole determination

A ratiometric electrochemical sensor is developed for fast, simple and accurate determination of BHA using polythionine/multiwalled carbon nanotube composite modified glassy carbon electrode (pThi/MWCNT/GCE). The preparation of pThi/MWCNT/GCE is characterized by various analytical techniques. The pThi/MWCNT composite is demonstrated to possess large specific surface area, good electrical conductivity, and high electrocatalytic ability. Moreover, it is demonstrated that the use of ratiometric signal involving the electro-oxidation of both BHA and pThi improves the accuracy and reliability of the BHA analysis due to the built-in correction function of the inner reference polythionine probe. A linear ratiometric signal can be achieved over the concentration range of 0.5-70.0 mu M with the detection limit of 0.21 mu M (SIN= 3). The BHA sensor also exhibits high selectivity, high reproducibility, and good stability, and can be used for the analysis of BHA in edible oil samples with satisfactory results. (C) 2022 Elsevier B.V. All rights reserved.

Automated summary

A ratiometric electrochemical sensor based on a polythionine/multiwalled carbon nanotube composite modified glassy carbon electrode was developed for the determination of BHA. The sensor exhibited high selectivity, reproducibility, and stability, and demonstrated satisfactory results in the analysis of BHA in edible oil samples.