Determination of proteins at nanogram levels by synchronous fluorescence scan technique with a novel composite nanoparticle as a fluorescence probe

Wang, Lun; Chen, Hongqi; Wang, Leyu; Wang, Guangfeng; Li, Ling; Xu, Fagong

doi:10.1016/j.saa.2003.12.024

Cited by 24 publications

(7 citation statements)

References 26 publications

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“…The ZnS NPs were prepared by the procedure reported previously with some modification. A 4.0 mL portion of 0.10 M (NaPO 3 ) 6 as a stabilizing regent and 2.0 mL of 0.10 M ZnCl 2 were added into 192 mL of ultrapure water under ultrasonic irradiation and N 2 protection for 30 min.…”

Section: Methodsmentioning

confidence: 99%

Electrogenerated Chemiluminescence of ZnS Nanoparticles in Alkaline Aqueous Solution

Shen

Cui

et al. 2007

J. Phys. Chem. C

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A band gap-electrogenerated chemiluminescence (ECL) of ZnS nanoparticles (NPs) in alkaline aqueous solution was first observed at a platinum electrode during the potential applied between −2.0 V (versus Ag/AgCl, saturated KCl) and +0.86 V. The ECL peak of ZnS NPs in 0.10 M sodium hydroxide solution appeared at +0.86 V, and the ECL peak wavelength of the ZnS NPs was ∼460 nm. A core/shell structure of ZnS/Zn(OH)2 was demonstrated by a UV absorption and photoluminescence (PL) spectra, high-resolution transmission electron microscopy, and energy dispersive X-ray spectroscopy. The ECL scheme of the ZnS NPs in alkaline aqueous solution was proposed, indicating that the surface passivation effect and the core/shell structure of ZnS/Zn(OH)2 played a significant role in the ECL process and that the similarity of the ECL and PL spectra of semiconductor NPs was dependent on the extent of the surface passivation. The ECL intensity of ZnS NPs in alkaline aqueous solution was greatly enhanced by an addition of K2S2O8.

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Section: Methodsmentioning

confidence: 99%

Electrogenerated Chemiluminescence of ZnS Nanoparticles in Alkaline Aqueous Solution

Shen

Cui

et al. 2007

J. Phys. Chem. C

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“…Inherent mechanisms have been extensively proposed for the uorescence quenching emission of QDs including the inner lter effect, non-radiative recombination pathways, energy transferring, charge diverting, an electron transfer process, surface adsorption, surface bound complexation equilibrium attraction and others. [55][56][57][58][59][60][61] In the present study, to explore the mechanism of the interaction between CdS QDs and VB 12 , the UV-visible absorption spectra of CdS QDs were investigated in the absence and presence of VB 12 . As shown in Fig.…”

Section: Fluorescence Quenching Mechanism Of Cds Qds By Vb 12mentioning

confidence: 99%

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

et al. 2014

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“…23 So far, many papers have focused on the detection of metal ions such as Pb (II), Cu(II), Hg(II), Ag(I), and CN À with functionalized QDs via analyte-induced changes in photoluminescence in aqueous solution. [24][25][26][27][28][29] However, little attention has been paid to the use of QDs as FL probes for drug determination. Based on the FL quenching of the CdSe QDs by spironolactone, Liang et al presented a simple, rapid and specific method for spironolactone determination, which considered that the changes in surface-bound organic molecules of QDs were induced by spironolactone.…”

Section: Introductionmentioning

confidence: 99%

A novel method for ranitidine hydrochloride determination in aqueous solution based on fluorescence quenching of functionalised CdS QDs through photoinduced charge transfer process: Spectroscopic approach

Gore

Mote

Tele

et al. 2011

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A novel method for the quantitative determination of ranitidine hydrochloride (RNH) based on the fluorescence quenching of functionalised CdS quantum dots (QDs) by RNH in aqueous solution was proposed. The method is simple, rapid, specific and highly sensitive with good precision. The thioglycolic acid (TGA)-capped CdS QDs were synthesized from cadmium nitrate and sodium sulfide in alkaline solution. Under the optimal conditions, the Stern-Volmer calibration plot of F(0)/F against concentration of RNH was linear in the range of 0.50-15.0 μg mL(-1) with a correlation coefficient of 0.996. The limit of detection (LOD) was 0.38 μg mL(-1). The method was satisfactorily applied to the direct determination of RNH in pharmaceutical formulations with no significant interference from excipients. The results were found to be in good agreement with those obtained by the reference method and the claimed value. The accuracy and reliability of the method were further ascertained by recovery studies via the standard-addition method, with percentage recoveries in the range of 98.47 to 102.30%. The possible fluorescence quenching mechanism for the reaction was also discussed.

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Determination of proteins at nanogram levels by synchronous fluorescence scan technique with a novel composite nanoparticle as a fluorescence probe

Cited by 24 publications

References 26 publications

Electrogenerated Chemiluminescence of ZnS Nanoparticles in Alkaline Aqueous Solution

Electrogenerated Chemiluminescence of ZnS Nanoparticles in Alkaline Aqueous Solution

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

A novel method for ranitidine hydrochloride determination in aqueous solution based on fluorescence quenching of functionalised CdS QDs through photoinduced charge transfer process: Spectroscopic approach

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Determination of proteins at nanogram levels by synchronous fluorescence scan technique with a novel composite nanoparticle as a fluorescence probe

Cited by 24 publications

References 26 publications

Electrogenerated Chemiluminescence of ZnS Nanoparticles in Alkaline Aqueous Solution

Electrogenerated Chemiluminescence of ZnS Nanoparticles in Alkaline Aqueous Solution

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

A novel method for ranitidine hydrochloride determination in aqueous solution based on fluorescence quenching of functionalised CdS QDs through photoinduced charge transfer process: Spectroscopic approach

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