Fig. 30. DPVs at the glassy carbon electrode GCE on the PLaE–Chit/AuNPs–GN nanocomposite for (a) 10 ppb of methyl parathion and then 10 ppb of methyl parathion mixed with (b) 10 ppb of carbendazim, (c) 10 ppb of lindane, (d) 1 ppm of Fe³⁺, (e) 1 ppm of Zn²⁺, (f) 1 ppm of Cu²⁺, (g) 1 ppm of Pb²⁺, (h) 1 ppm of K⁺, (i) 1 ppm of NO³⁻, (j) 1 ppm of PO₄³⁻, (k) 1 ppm of SO₄²⁻, (l) 0.5 mM glucose, or (m) 0.5 mM citric acid. [Reprinted with permission from ref. 659, J. Bao, C. Hou, M. Chen, J. Li, D. Huo, M. Yang, X. Luo and Y. Lei, Plant Esterase–Chitosan/Gold Nanoparticles–Graphene Nanosheet Composite-Based Biosensor for the Ultrasensitive Detection of Organophosphate Pesticides, J. Agric. Food Chem., 2015, 63, 10319–10326. Copyright© 2018 American Chemical Society.].