Rapid, sensitive detection of organophosphorus pesticides through auto-inductive cascade signal amplification approach and a sensitized behavior of Tb3+ hydrogel in point-of-care

A strategy for detecting trace amount OPs was designed and developed by combining auto-inductive cascade signal amplification approach and a sensitization behavior of Tb3+ hydrogel, which could greatly improve the sensitivity and convenience of OPs detection. Due to the promotion by CA-PhSH, the process of auto-inductive cascade and luminescence response could be completed only in 3 min and 5 min respectively, which had greatly improved the efficiency of OPs detection. The lowest detection limit of [email protected]3+/hydrogel platform with the auto-inductive cascade approach for OPs was only 0.39 nM. In addition, a portable smartphone system had also developed by this hydrogel platform and had successfully applied to detect OPs in vegetable, fruit samples and accurately monitor the degradation process of OPs in cabbage leaves. The good results demonstrated that [email protected]3+/hydrogel platform with the auto-inductive signal amplification approach was a powerful tool in the application of OPs detection.