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“…Using six replicate detections of DA, we determined the limit of detection (LOD) (Chandran et al, 2006) to be $ 7.80 nM, which indicates that L-cys ZnS:Mn QDs possesses high sensitivity to detect DA. This value is 1-2 orders of magnitude higher than those reported for Cd-based QDs probes for detection of DA via fluorescence and electro-generated chemiluminescence methods Liu et al, 2008b;Xiangzhao et al, 2013).…”
Section: Effect Of the Concentration Of Dopamine On The Phosphorescenmentioning
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“…Using six replicate detections of DA, we determined the limit of detection (LOD) (Chandran et al, 2006) to be $ 7.80 nM, which indicates that L-cys ZnS:Mn QDs possesses high sensitivity to detect DA. This value is 1-2 orders of magnitude higher than those reported for Cd-based QDs probes for detection of DA via fluorescence and electro-generated chemiluminescence methods Liu et al, 2008b;Xiangzhao et al, 2013).…”
Section: Effect Of the Concentration Of Dopamine On The Phosphorescenmentioning
“…Mu and co-workers built a DA fluorescent sensor based on adenosine-capped CdSe/CdS/ZnS QDs, and found a LOD of $ 20 nM with a linear working range of 100 nM to 20 μM, which was ascribed to the strong interaction between adenosine and DA . In parallel, Xiangzhao and co-workers reported that the silica-capped CdTe based sensor can detect DA in the range of 500 nM to 100 μM with a LOD of $ 240 nM, which was associated to the hydrogen bonding and electrostatic interaction between silica and DA in alkaline solution (Xiangzhao et al, 2013). Although the interaction of DA with Cdbased QDs in the form of bioconjugates has been studied under certain conditions, the selective capture of DA molecules by surface-complexed ZnS:Mn QDs via a phosphorescent quenching process is still a big challenge.…”
Section: Introductionmentioning
“…Targeted research on the use of quantum dots (QDs) [74] for bioanalytes of small molecular weight has been successful in the selective detection of biothiols over other amino acids without thiol groups. Guo et al used N,S-carbon dots (N,S-CDs) complexed with Cu II , in which the metal acts as the quencher, and the N,S-CDs fluorescence was reactivated by biothiols.…”
Section: Nanoprobes As Materials For the Potential Discrimination Of mentioning
“…As mentioned above, the interaction between QDs and the oxidized form of DA leads to quenching of the fluorescence intensity. The method was applied to the determination of DA-spiked human-serum samples in the range 0.0005-0.1 mM (LOD, 2.41 × 10 −4 mM), with acceptable recovery values [20].…”
Section: Quantum Dotsmentioning