Surface engineering of roselike lanthanum molybdate electrocatalyst modified screen-printed carbon electrode for robust and highly sensitive sensing of antibiotic drug

• DOI: 10.1016/j.microc.2021.106044
• Publication Date: 2021-02-10T07:12:34Z
• Authors: Subramaniyan Vinoth; M. Govindasamy; Sea-Fue Wang; Asma A. Alothman; Razan A. Alshgari
• Keywords: Lanthanum; Electrochemical gas sensor; Supporting electrolyte

Abstract Creation of efficient electrochemical sensor for the ultrasensitive identification of food toxic chemicals (organo arsenic compound). We also investigated the possibility of rapid identification of coccidiostat using rose-like tetragonal lanthanum molybdates as a modified electrode. Moreover, the lanthanum molybdates modified electrodes were concentrated on the evolution of electrochemical reduction achievements for the analysis of organo arsenic compound roxarsone (ROX) in different meat products. The modified sensor is constructed by rose-like lanthanum molybdates (RL-La2(MoO4)3) on to an SPCE (screen-printed carbon electrode). The two-dimensional nanosheets like RL-La2(MoO4)3 electrocatalyst reveal enhanced detection towards ROX by the combination of electrostatic attraction between ROX and RL-La2(MoO4)3 surfaces. The modified sensor has exhibited a very low detection limit (12.4 nM) in the neutral supporting electrolyte by electrochemical methods. Furthermore, the modified sensor ranges of ROX is 0.025–2650 μM. Also, sensitivity of RL-La2(MoO4)3 electrode is calculated as 13.366 μA·μM−1·cm−2 and 42.619 μA·μM−1·cm−2. The lanthanum molybdates modified device shows good stability and reasonable reproducibility. The obtained electrochemical results are satisfactory based on the RL-La2(MoO4)3 electrocatalyst modified sensor for food analysis.