Photoluminescent nanoprobes based on thiols capped CdTe quantum dots for direct determination of thimerosal in vaccines

Tall, Amidou; Costa, Karolayne Rocha da; Oliveira, Maria Janaína de; Tapsoba, Issa; Rocha, Uéslen; Sales, Tasso O.; Goulart, Marília Oliveira Fonseca; Santos, Josué Carinhanha Caldas

doi:10.1016/j.talanta.2020.121545

Cited by 12 publications

(5 citation statements)

References 43 publications

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“…Surface ligands play a crucial role in the interaction between QDs and analytes, strongly affecting the detection mechanisms [46,47]. The stabilizing ligands typically used in aqueous synthesis have a thiol group at one end, which remains attached to the nanoparticle's surface, and another terminal group such as carboxylic (-COOH) or amino (-NH2) ones, which can impart different electrical charges to the QDs depending on the Furthermore, it was observed that the variation in FWHM values occurred between 0.1 and 7.3 nm, considering the four studied anions, with CO 3 2− and HCO 3 being the most expressive.…”

Section: Detection Mechanism Of Cdte-cya Qdsmentioning

confidence: 99%

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Development of Fluorescent Sensors for Biorelevant Anions in Aqueous Media Using Positively Charged Quantum Dots

Silva,

Pereira,

Pereira

et al. 2024

Micromachines

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Quantum dots (QDs) have captured the attention of the scientific community due to their unique optical and electronic properties, leading to extensive research for different applications. They have also been employed as sensors for ionic species owing to their sensing properties. Detecting anionic species in an aqueous medium is a challenge because the polar nature of water weakens the interactions between sensors and ions. The anions bicarbonate (HCO3−), carbonate (CO32−), sulfate (SO42−), and bisulfate (HSO4−) play a crucial role in various physiological, environmental, and industrial processes, influencing the regulation of biological fluids, ocean acidification, and corrosion processes. Therefore, it is necessary to develop approaches capable of detecting these anions with high sensitivity. This study utilized CdTe QDs stabilized with cysteamine (CdTe-CYA) as a fluorescent sensor for these anions. The QDs exhibited favorable optical properties and high photostability. The results revealed a gradual increase in the QDs’ emission intensity with successive anion additions, indicating the sensitivity of CdTe-CYA to the anions. The sensor also exhibited selectivity toward the target ions, with good limits of detection (LODs) and quantification (LOQs). Thus, CdTe-CYA QDs show potential as fluorescent sensors for monitoring the target anions in water sources.

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Section: Detection Mechanism Of Cdte-cya Qdsmentioning

confidence: 99%

Section: Detection Mechanism Of Cdte-cya Qdsmentioning

confidence: 99%

Development of Fluorescent Sensors for Biorelevant Anions in Aqueous Media Using Positively Charged Quantum Dots

Silva,

Pereira,

Pereira

et al. 2024

Micromachines

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“…CdTe quantum dots (QDs) are typical water-soluble QDs that have been deployed as photoluminescence (PL) probes for diverse applications including metal sensing [1][2][3][4], cell imaging [5,6], and pesticide detection [7,8]. In those applications, the PL intensity of QDs under constant excitation conditions usually decreases simultaneously with the concentration of the analyte.…”

Section: Introduction *mentioning

confidence: 99%

Effects of Zn (II) on the Optical Properties of CdTe Quantum Dots and Their Photoluminescence Response to Lead Ion

Nhàn¹,

Duc²,

Dũng³

et al. 2022

NST

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Water-soluble CdTe quantum dots (QDs) have been utilized as photoluminescence probes for the detection of metal ions such as Pb2+, Hg2+, Cd2+, etc. We initially developed highly photoluminescence (PL) Zn-doped CdTe for toxic ions detection. A study on the changes of optical properties of Zn-doped CdTe and CdTe QDs when exposed to Pb2+ suggested that Pb2+ could act as a surface passivating agent to reduce Te2- dangling bonds while Zn2+ dopant stabilizes the QDs surface against ambient oxidation. The results demonstrated herein provide useful understandings of the interactions between water-soluble QDs and metal ions. These results suggest further applications of QDs in sensing metal ions.

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“…QDs must be transferred to aqueous solutions before they are used in biological applications. The most popular route for the synthesis of QDs is the aqueous technique, which utilizes thiols as stabilizers in the aqueous phase [10][11][12][13]. In the aqueous phase synthesis of CdTe QDs, tellurium precursors are mainly obtained using NaBH 4 to reduce Te.…”

Section: Introductionmentioning

confidence: 99%

One-step synthesis of high-quality CdTe quantum dots using hydroxylamine hydrochloride to reduce sodium tellurite

et al. 2021

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Under alkaline conditions, thioglycollic acid (TGA)-CdTe quantum dots were prepared using hydroxylamine hydrochloride to reduce sodium tellurite in aqueous phase. The effects of n (Te 2− ) /n (HONH3Cl) , reflux temperature, n (TGA) /n (Cd 2+) , and reflux time on the properties of the CdTe quantum dots were investigated to determine the optimum synthesis conditions. The structure and properties of the CdTe quantum dots were characterized via X-ray powder diffraction, photoluminescence spectrometry, and UV-Vis absorption spectrometry. Results showed that the CdTe quantum dots synthesized herein were cubic crystals, and the maximum fluorescence emission wavelength could be adjusted from 520 to 570 nm. Under the optimum conditions, the fluorescence quantum yield of the CdTe quantum dots reached 46.57% at reflux for 1 h.

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Photoluminescent nanoprobes based on thiols capped CdTe quantum dots for direct determination of thimerosal in vaccines

Cited by 12 publications

References 43 publications

Development of Fluorescent Sensors for Biorelevant Anions in Aqueous Media Using Positively Charged Quantum Dots

Development of Fluorescent Sensors for Biorelevant Anions in Aqueous Media Using Positively Charged Quantum Dots

Effects of Zn (II) on the Optical Properties of CdTe Quantum Dots and Their Photoluminescence Response to Lead Ion

One-step synthesis of high-quality CdTe quantum dots using hydroxylamine hydrochloride to reduce sodium tellurite

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