Visual colorimetric immunosensor for sensitive detection of 4-Chlorophenoxyacetic based on TMB2+-mediated etching of Au NRs

Table 1 The cross-reactivity with structural analogues using icELISA

Analytes	IC₅₀ (ng mL⁻¹)	CR (%)
4-CPA	0.8	100
2,4-Dichlorophenoxyacetic acid	2.5	32
4-Formylphenoxyacetic acid	5.2	15.4
Phenoxyacetic acid	50.1	1.6
4-Aminophenoxyacetic acid	74.9	1.1
4-Chlorobenzoic acid	> 1000	< 1
4-Chlorophenylacetic acid	> 1000	< 1
6-Benzyladenine	> 1000	< 1

ISSN: 2731-9970