Buket ER DEMİRHAN, Burak DEMİRHAN, Hayriye Eda ŞATANA KARA

Mn-doped ZnS quantum dots as a room-temperature phosphorescent probe foranalysis of glutamic acid in foodstuffs

L-cysteine{capped Mn-doped ZnS quantum dots (QDs) were used for the determination of glutamic acidin foodstuffs. This method is based on measurement of the quenching of the phosphorescence intensity of the QDsafter interacting with glutamic acid. A linear response was observed from 50 to 500 ng mL1glutamic acid with alimit of detection of 6.79 ng mL1. Room temperature phosphorescence (RTP) intensity of the QDs was quenchedrapidly upon the addition of the quencher and the reaction reached equilibrium within 2 min. The quenching mechanismof phosphorescence of Mn-doped ZnS QDs by glutamic acid is dynamic and the quenching constant was found as 1.9 105M1. The developed method has some advantages such as freeness of interference from auto uorescence orcommon cations. The results showed that the proposed method is sensitive, selective, and fast, and does not require aderivatization step.

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