1 research outputs found
Room-temperature phosphorescence determination of melamine in dairy products using L-cysteine-capped Mn-doped zinc sulfide (ZnS) quantum dots
A simple, sensitive, and precise room-temperature phosphorescence method
was developed for the determination of melamine in dairy products using
lcysteine-capped Mn-doped zinc sulfide (ZnS) quantum dots as a probe.
This method is based on the quenching of the phosphorescence signal of
quantum dots by the interaction with melamine. Under optimum conditions,
phosphorescence intensity was quenched by various concentrations of
melamine in a linear range from 50 to 500 ng/mL, with a detection limit
of 5.95 ng/mL in 10 mM phosphate buffer (pH 7.4). The relative standard
deviation for 5 replicate measurements was 0.15\%. The developed method
was applied to dairy products to determine melamine concentrations;
recovery values ranged from 96.3 to 104.7\%