A novel FRET probe for selective and sensitive determination of vitamin B₁₂by functionalized CdS QDs in aqueous media: applications to pharmaceutical and biomedical analysis

Turn-on fluorescence probe for selective and sensitive detection of d-penicillamine by CdS quantum dots in aqueous media: Application to pharmaceutical formulation

“…In this connection, many mechanisms have been proposed for the design of sensors for various analytes, such as inorganic ions [37,38,[53][54][55][56][57], biomolecules [22,30,33] and active pharmaceutical ingredients [34,35] based on the surface states fluorescence modulation of QDs. Similarly, herein we have suggested that same approach can also be utilized for turn-on sensing of d-PA based on MPA-CdS QDs.…”

“…Furthermore, QDs-based FRET sensors have been widely employed for biological systems [31,32]. Recently, our group has presented a novel approach to detect the vitamin B-12 by CdS QDs FRET probe [33]. We have also reported a novel method for the quantitative determination of ranitidine hydrochloride (RNH) based on the fluorescence quenching of functionalized CdS quantum dots in aqueous solution [34].…”

The determination of nitrite by a graphene quantum dot fluorescence quenching method without sample pretreatment

“…The linear regression equation is F 0 /F = 1.8508 × 10 3 [nitrite] + 0.997, and the corresponding regression coefficient is 0.9945. The equation LOD = (3.3σ/k) was used to calculate the limit of detection (LOD), where σ is the standard deviation of the y‐intercepts of the regression lines and k is the slope of the calibration graph, so the low detection limit for nitrite was 9.8 μmol/L. Once more diluted GQDs (0.1 mg/ml) were used, the LOD for nitrite could be improved (Figure ) and reached 5.4 nmol/L.…”

Near Infrared Emission of Ag2S Quantum Dots and their Fluorescence Quenched by Gold Nanoparticles

“…Initially, the quantum dots were used in microelectronics and optoelectronic materials [1,2] , then quantum dots were applied in biological and medical aspects [3,4] due to their visible area unique and excellent fluorescence properties. With the deepening research of quantum dots, quantum dots have been extended to quantitative analysis of heavy metal ions, small organic molecules and drugs [5,6] . Currently most research is mainly concentrated on CdX (X = S, Se, Te) or CdX as the core, the rest of the semiconductor material for the shell of the core-shell quantum dots.…”