A novel and sensitive turn-on fluorescent biosensor for the DNA detection using Sm3+-modulated glutathione-capped CdTe quantum dots

Shen, Yizhong; Liu, Shaopu; Yang, Kun‐Lin; Wang, Linlin; Tan, Xuanping; He, Yonghong

doi:10.1016/j.snb.2014.04.014

Cited by 42 publications

(22 citation statements)

References 45 publications

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“…Cadmium–telluride (CdTe) based QDs are fluorescent semiconductor nanoparticles approximately 2–10 nm in diameter, with unique photophysical properties, such as narrow and size‐dependent fluorescence, broad absorption spectra, strong fluorescence intensity, and excellent anti‐photobleaching . CdTe QDs are rapidly being applied in many fields, such as solar cells, light‐emitting devices, biological and medical imaging, drug testing, virus detection, and so on . In biological applications, the CdTe QDs synthesized in aqueous medium could be directly used without modification compared with that synthesized in organic medium.…”

Section: Introductionmentioning

confidence: 99%

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Optical and structural properties of hydrophilic CdTe quantum dots in cationic starch polymeric matrix

2015

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In this work, water soluble CdTe quantum dots (QDs) were incorporated into a biopolymeric matrix of polyacrylamide grafted onto cationic starch (CS-g-PAAm) to enhance optical properties of QDs. To this aim, the effect of various factors such as AAm concentration, molar ratio of CS-g-PAAm/CdTe, reaction temperature and time on optical properties of obtained QDs were investigated via UV-visible (UV-vis) and fluorescence spectra. Finally, the optimized QDs were characterized by Fourier transform infrared (FT-IR), transmission electron microscopy (TEM), thermo-gravimetric (TG) analysis, and energy dispersive X-ray analysis (EDX).

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Section: Introductionmentioning

confidence: 99%

“…Besides, aqueous synthesis of CdTe QDs has less toxic waste to the environment . The biggest drawback of these aqueous synthesized QDs is poor quality and relatively low photoluminescence quantum yield with taking a long time to accomplish for the slow growth speed of QDs .…”

Section: Introductionmentioning

confidence: 99%

Optical and structural properties of hydrophilic CdTe quantum dots in cationic starch polymeric matrix

2015

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“…To the best of our knowledge, the increase in volume of the scattering molecule was advantageous to the enhancement of the scattering intensity. On the contrary, the decrease of volume of the scattering molecule will result in a decrease of scattering intensity . According to above primary analysis, the RRS intensity of NALC‐Ag NPs was quenched in the presence of L‐tyrosine because of the decrease in volume of the scattering molecule.…”

Section: Resultsmentioning

confidence: 93%

Chiral Recognition of Tyrosine Enantiomers Based on Decreased Resonance Scattering Signals With Silver Nanoparticles as Optical Sensor

et al. 2014

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A novel chiral sensing platform, employing silver nanoparticles capped with N-acetyl-L-cysteine (NALC-Ag NPs), was utilized for the discrimination of L-tyrosine and D-tyrosine. This nanosensor, which could be used as an optical sensing unit and chiral probe, was characterized by transmission electron microscopy (TEM) and resonance Rayleigh scattering (RRS) spectroscopy. After the proposed sensing platform interacted with L-tyrosine and D-tyrosine, a decreased resonance scattering signal was only obtained from L-tyrosine. This phenomenon offered a useful assay for the selectivity and determination of L-tyrosine with the RRS method. The linear range and detection limit of L-tyrosine were 0.2838-20.0 µg⋅mL(-1) and 0.0860 µg⋅mL(-1) , respectively. In addition, experimental factors such as acidity, interaction time, and the concentration of enantiomers were investigated with regard to the effect on enantioselective interaction.

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“…GSH‐capped CdTe QDs were synthesized according to a previously described method . Under N 2 atmosphere and magnetic stirring, tellurium powder (0.0383 g) was reacted with excess sodium borohydride in deionized water to produce the colorless solution of sodium hydrogen telluride (NaHTe).…”

Section: Methodsmentioning

confidence: 99%

Sensitive determination of enoxacin in pharmaceutical formulations by its quench effect on the fluorescence of glutathione‐capped CdTe quantum dots

2015

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A sensitive and simple method for the determination of enoxacin (ENX) was developed based on the fluorescence quenching effect of ENX for glutathione (GSH)-capped CdTe quantum dots (QDs). Under optimum conditions, a good linear relationship was obtained from 4.333 × 10(-9) mol⋅L(-1) to 1.4 × 10(-5) mol⋅L(-1) with a correlation coefficient (R) of 0.9987, and the detection limit (3σ/K) was 1.313 × 10(-9) mol⋅L(-1). The corresponding mechanism has been proposed on the basis of electron transfer supported by ultraviolet-visible (UV) light absorption, fluorescence spectroscopy, and the measurement of fluorescence lifetime. The method has been applied to the determination of ENX in pharmaceutical formulations (enoxacin gluconate injections and commercial tablets) with satisfactory results. The proposed method manifested several advantages such as high sensitivity, short analysis time, low cost and ease of operation.

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A novel and sensitive turn-on fluorescent biosensor for the DNA detection using Sm3+-modulated glutathione-capped CdTe quantum dots

Cited by 42 publications

References 45 publications

Optical and structural properties of hydrophilic CdTe quantum dots in cationic starch polymeric matrix

Optical and structural properties of hydrophilic CdTe quantum dots in cationic starch polymeric matrix

Chiral Recognition of Tyrosine Enantiomers Based on Decreased Resonance Scattering Signals With Silver Nanoparticles as Optical Sensor

Sensitive determination of enoxacin in pharmaceutical formulations by its quench effect on the fluorescence of glutathione‐capped CdTe quantum dots

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