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. 2021 Jul 10;414(1):63–74. doi: 10.1007/s00216-021-03501-6

Fig. 2.

Fig. 2

Working principle of a label-free electrochemical aptasensor for determination of bisphenol A based on magnetic gold nanocomposite. GCE = glassy carbon electrode, Pr-SH = (3-thiopropyl) triethoxysilane, MWCNTs = multiwall carbon nanotubes, MCH = 6-mercapto−1-hexanol, BPA = bisphenol A. Adapted from [25] Copyright 2018, with permission from John Wiley and Sons