Room-temperature phosphorescence determination of melamine in dairy products using l-cysteine-capped Mn-doped zinc sulfide (ZnS) quantum dots

Demirhan, Buket Er; Kara, Hayriye Eda Şatana

doi:10.3168/jds.2014-9221

Cited by 13 publications

(2 citation statements)

References 39 publications

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“…This technique was later applied in milk samples and displayed recoveries between 96~103% with a RSD of 1.2%. Demirhan and co-workers also proposed the RTP-based determination of melamine by means of L-cysteine-capped Mn-doped zinc sulfide (ZnS) quantum dots [45]. The RTP of this probe decreased linearly between 396 nM-3.96 µM of melamine with a LOD of 47 nM in 10 mM phosphate buffer (at pH 7.4).…”

Section: Carbon and Quantum Dots For Melamine Detectionmentioning

confidence: 99%

Review on Nanomaterial-Based Melamine Detection

Shellaiah

Sun

2019

Chemosensors

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Illegal adulteration of milk products by melamine and its analogs has become a threat to the world. In 2008, the misuse of melamine with infant formula caused serious effects on babies of China. Thereafter, the government of China and the US Food and Drug Administration (FDA) limited the use of melamine of 1 mg/kg for infant formula and 2.5 mg/kg for other dairy products. Similarly, the World Health Organization (WHO) has also limited the daily intake of melamine of 0.2 mg/kg body weight per day. Many sensory schemes have been proposed by the scientists for carrying out screening on melamine poisoning. Among them, nanomaterial-based sensing techniques are very promising in terms of real-time applicability. These materials uncover and quantify the melamine by means of diverse mechanisms, such as fluorescence resonance energy transfer (FRET), aggregation, inner filter effect, surface-enhanced Raman scattering (SERS), and self-assembly, etc. Nanomaterials used for the melamine determination include carbon dots, quantum dots, nanocomposites, nanocrystals, nanoclusters, nanoparticles, nanorods, nanowires, and nanotubes. In this review, we summarize and comment on the melamine sensing abilities of these nanomaterials for their suitability and future research directions.

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Section: Carbon and Quantum Dots For Melamine Detectionmentioning

confidence: 99%

Review on Nanomaterial-Based Melamine Detection

Shellaiah

Sun

2019

Chemosensors

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“…28−30 Consequently, QDs have gained great interest as luminescent probes for the determination of various analytes in different sample matrices. 31,32 This article presents a simple room temperature phosphorimetric (RTP) method using L-cysteine-capped Mn-doped ZnS QDs for the determination of GLU in foodstuffs. Previously described spectrometric and luminescence methods for determination of GLU need derivatization steps, which are time consuming and need chemicals that may cause interference.…”

Section: Introductionmentioning

confidence: 99%

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

Kara¹,

Demirhan²,

Demirhan³

2016

Turk J Chem

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L-cysteine-capped Mn-doped ZnS quantum dots (QDs) were used for the determination of glutamic acid in foodstuffs. This method is based on measurement of the quenching of the phosphorescence intensity of the QDs after interacting with glutamic acid. A linear response was observed from 50 to 500 ng mL −1 glutamic acid with a limit of detection of 6.79 ng mL −1 . Room temperature phosphorescence (RTP) intensity of the QDs was quenched rapidly upon the addition of the quencher and the reaction reached equilibrium within 2 min. The quenching mechanism of phosphorescence of Mn-doped ZnS QDs by glutamic acid is dynamic and the quenching constant was found as 1.9× 10 5 M −1 . The developed method has some advantages such as freeness of interference from autofluorescence or common cations. The results showed that the proposed method is sensitive, selective, and fast, and does not require a derivatization step.

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