Highly resistant and sensitive colorimetric immunochromatographic assay for sibutramine (SBT) illegally adulterated into diet food based on PDA/AuNP labelling

Polydopamine coated AuNPs (PDA/AuNPs) with controlled shell thickness and packing density are synthesized and conjugated to mAb, which demonstrate high tolerance to salt and good stability in a wide pH range and improve the sensitivity of ICA.