Visual detection of nitrite in sausage based on a ratiometric fluorescent system

A novel ratiometric fluorescence sensor based on fluorescence resonance energy transfer (FRET) between MoS2 QDs and AuNCs was developed for nitrite detection in sausages. The MoS2 QDs-AuNCs nanocomposite exhibited dual emission peaks at 430 nm and 615 nm under 365 nm excitation. With addition of nitrite, the fluorescence of AuNCs was quenched due to the agglomeration of AuNCs, whereas the emission of MoS2 QDs increased for the blocked FRET. With...