Electrochemical sensing of bisphenol A based on polyglutamic acid/amino-functionalised carbon nanotubes nanocomposite

A new ratiometric electrochemical sensor for sensitive detection of bisphenol A based on poly-β-cyclodextrin/electroreduced graphene modified glassy carbon electrode

“…It is worthy to note that the electrochemical ratiometry displays a lower detection limit and wider linear range than the electrochemical method using single redox label. The detection limit of the proposed sensor is also lower than those obtained by other electrochemical methods reported previously [1,[11][12][13][14][15][16][17][18][19][20][21][22][23] (Table 1). The predominant reasons might be as follows: (1) the good characteristics of the ratiometric electrochemical assay (self-calibration, low detection limit) [43,[60][61]; (2) the synergistic effect of the electro-reduced graphene (high surface area and good electron transfer property) and Pβ-CD (lots of CD units, the excellent enrichment and host-guest recognition properties of CD).…”

“…The predominant reasons might be as follows: (1) the good characteristics of the ratiometric electrochemical assay (self-calibration, low detection limit) [43,[60][61]; (2) the synergistic effect of the electro-reduced graphene (high surface area and good electron transfer property) and Pβ-CD (lots of CD units, the excellent enrichment and host-guest recognition properties of CD). thin-film electrode array 44-4400 44 [11] Graphene/GC 80-5000 20 [12] CTAB/GC 600-100000 100 [13] peptide/Au electrode 1-5000 0.7 [14] SWCNT-CD/GC 10.8-18500 1 [15] CS/N-GS/GC 10-1300 5 [16] Gr-SP-Tyr/GC 2-5480 0.72 [17] Laccase-thionine-CB/SPCE 500-50000 200 [18] AuNPs/SGNF/GC 80-250000 35 [19] SWCNTs-COO-Poly-IL/GC 5-30000 1 [20] PGA/MWCNT-NH2/GC 100-10000 20 [21] MWCNTs/CoPc/SF/GC 50-3000 30 [22] Tyr-NiNPs/SPCE 910-48000 7.1 [23] RhB-incubated Similarly, no interference is observed for 1-naphthols, 2-naphthols, 4-aminophenol (5 equiv). These imply that the developed method has good anti-interferent ability for these inorganic ions and phenols.…”

“…Among them, electrochemical methods have advantages of simplicity, high sensitivity, good selectivity and low cost [15][16][17][18][19][20][21][22][23]. However, sensitive and selective electrochemical determination of BPA is still a challenge due to the poor electron transfer between hydrophobic BPA and hydrophilic sensing interface which is required in aqueous solutions.…”

Aptamer-functionalized nanoporous gold film for high-performance direct electrochemical detection of bisphenol A in human serum

“…These chromatography and mass spectrometry-based techniques can analyze BPA with high sensitivity, however, large capital investment, skilled operators, and cumbersome sample preparation and pretreatment are required, reducing their applicability of on-site and rapid detection of BPA in various samples and matrices [9,11]. The other recently developed methods for BPA detection include enzyme-linked immunosorbent assay (ELISA) [12], fluorescent method [13], surface-enhanced Raman scattering [14,15], colorimetric methods [16], and electrochemical sensors [17][18][19][20][21][22][23][24][25][26][27][28][29]. Among those methods, electrochemical sensors are the widely accepted and employed group due to their simple operation, rapid response time, low cost, high sensitivity, potential for miniaturization, and capability of real sample analysis [9], thereby having promising potential for BPA analysis in human internal fluids.…”

“…To enhance the detectable signals, nanomaterials that possess large specific surface area and electrocatalytic property are usually utilized to catalyze the redox reaction of BPA. Electrochemical sensors that were developed with metal nanoparticles [18], quantum dots [19], carbon nanotubes [20,21], graphene [17,[22][23][24], and the composite of nanomaterials [25][26][27] have been reported for the detection of BPA. Besides BPA, however, there are many other phenolic compounds that also can be electrocatalyzed by the nanomaterials mentioned above, which may interfere the detection of BPA.…”