Silicon quantum dot-coated onto gold nanoparticles as an optical probe for colorimetric and fluorometric determination of cysteine

Liu, Lirong; Zhu, Gangbing; Zeng, Wei; Yi, Yinhui; Lv, Baohe; Qian, Junjuan; Zhang, Depeng

doi:10.1007/s00604-019-3228-9

Cited by 43 publications

(17 citation statements)

References 33 publications

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“…Colloidal Au sol was synthesized according to previous report. 32,33 In brief, In brief, 100.0 mL HAuCl4 aqueous solution (0.25 mM) was heated to 100 ℃ and kept reflux for several min. 4.0 mL trisodium citrate solution (38.8 mM) was quickly added to the refluxed HAuCl4 solution and the mixture was kept boiling and stirred for an additional 10 min.…”

Section: Construction Of Cea Sandwich-typeimmunosensormentioning

confidence: 99%

Sandwich-type electrochemical immunosensing of Hypopharyngeal carcinoma biomarker carcinoembryonic antigen based on N-doped hollow mesoporous nanocarbon spheres/gold hybrids as sensing platform and gold/ferrocene as signal amplifier

Zheng

Chen²,

Zhang

et al. 2021

Anal. Sci.

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In the present work, a highly sensitive sandwich-type electrochemical immunosensor of carcinoembryonic antigen (CEA) was developed by preparing N-doped hollow mesoporous nanocarbon spheres/gold hybrids (NHMN/Au) hybridsas sensing platformand Au/ferrocene (Au/Fc) as signal amplifiers. The large surface area and high conductivity as well as good biocompatibility of NHMN/Au can increase the loading of primary antibody (Ab1) and accelerate the electron transport rate of the electrode surface, while Au can carry immobilized secondary antibodies (Ab2) and Fc derivative (Fc-SH).By using Fc-SH as response probe, the experiments show that the peak current of probe could increase after occurring the specific recognition of Ab1-CEA-Ab2, thus a novel sandwich-type immunosensor of CEA was developed. Finally, the proposed method for CEA detection was applied in human serum and the obtained results are satisfactory, indicating the developed method has important clinical applications for CEA determination.

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Section: Construction Of Cea Sandwich-typeimmunosensormentioning

confidence: 99%

Sandwich-type electrochemical immunosensing of Hypopharyngeal carcinoma biomarker carcinoembryonic antigen based on N-doped hollow mesoporous nanocarbon spheres/gold hybrids as sensing platform and gold/ferrocene as signal amplifier

Zheng

Chen²,

Zhang

et al. 2021

Anal. Sci.

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“…), [ 6 ] pesticides, and industrial vapors. [ 7–9 ] Typically, colorimetric sensors use dyes, [ 10,11 ] plasmonic gold and silver nanoparticles, [ 12–15 ] semiconductor quantum dots, [ 16,17 ] graphene quantum dots, [ 18–20 ] photonic crystals, [ 21–24 ] and other nanoparticles as reporting agents, which display quantifiable change in color or intensity upon exposure to a specific target. [ 25,26 ] Another issue with industrial and environmental sensing is that the samples often need to be collected from the waste stream or difficult or dangerous to reach areas that make on‐site and in‐situ analysis a big challenge.…”

Section: Introductionmentioning

confidence: 99%

Spray‐n‐Sense: Sprayable Nanofibers for On‐Site Chemical Sensing

Bakshi

Snoswell

Kwok

et al. 2022

Adv Funct Materials

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A versatile "Spray-n-Sense" sprayable nanofiber technology for on-site chemical detection is demonstrated. Driven by compressed gas, the "Sprayn-Sense" nanofibers, as the name suggests, can be directly sprayed onto any kind or shape of surfaces, while the embedded chemical reporter enables simple colorimetric/fluorometric detection. Herein, nanofibers are sprayed on several surfaces including cardboard, glass, plastic, and rubber. The sensing capabilities of the "Spray-n-Sense" nanofibers are established through the detection of three different analytes including two metal ions (Fe 2+ and Fe 3+ using 1,10-phenanthroline and curcumin as chromogenic reporters, respectively) and ammonia (using rhodamine-B as a fluorogenic reporter) in aqueous media. Additional to being highly portable, the "Spray-n-Sense" nanofibers show impressive sensor characteristics with a sub-ppm lower limit of detection (LLOD) for Fe 2+ and a wide linear working range. Whereas, the LLOD of 6.2 and 32 ppm is achieved for Fe 3+ ions and ammonia, respectively. A custom-designed smartphone application enables quantitative analysis for reliable on-site sensing. The selectivity and specificity are imparted by the embedded reporter, and thus allow analyte detection in complex real-life samples and simultaneous detection of multiple chemical species through co-doping. The "Spray-n-Sense" nanofibers also allow for the detection of target analytes in solid samples.

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“…Over the past two decades, tremendous progress has been made in the fluorescence sensor region of SiNPs for intrinsic nontoxicity, which are deemed to be suitable alternatives to traditional II-VI quantum dots [10,11]. Previous works have reported the successful use of SiNPs for the detection of Cu 2+ [12], Hg 2+ [13], dopamine [14], heparin [15], 2,4,6-trinitrophenol [16], phosphatase [17], glutathione [18], nitrite [19], chromium [20], cysteine [21], chlorogenic acid [22], and tetracycline [23]. However, there are few studies regarding the use of SiNPs as a probe for the detection of F − ion.…”

Section: Introductionmentioning

confidence: 99%

“Switch-Off-On” Detection of Fe3+ and F− Ions Based on Fluorescence Silicon Nanoparticles and Their Application to Food Samples

Zhao

Ren

et al. 2022

Nanomaterials

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An approach to the detection of F− ions in food samples was developed based on a “switch-off-on” fluorescence probe of silicon nanoparticles (SiNPs). The fluorescence of the synthetic SiNPs was gradually quenched in the presence of Fe3+ ion and slightly recovered with the addition of F− ion owing to the formation of a stable and colorless ferric fluoride. The fluorescence recovery exhibited a good linear relationship (R2 = 0.9992) as the concentration of F− ion increased from 0 to 100 μmol·L−1. The detection limit of the established method of F− ion was 0.05 μmol·L−1. The recovery experiments confirmed the accuracy and reliability of the proposed method. The ultraviolet–visible spectra, fluorescence decays, and zeta potentials evidenced the fluorescence quenching mechanism involving the electron transfer between the SiNPs and Fe3+ ion, while the fluorescence recovery resulted from the formation of ferric fluoride. Finally, SiNPs were successfully applied to detect F− ions in tap water, Antarctic krill, and Antarctic krill powder.

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Silicon quantum dot-coated onto gold nanoparticles as an optical probe for colorimetric and fluorometric determination of cysteine

Cited by 43 publications

References 33 publications

Sandwich-type electrochemical immunosensing of Hypopharyngeal carcinoma biomarker carcinoembryonic antigen based on N-doped hollow mesoporous nanocarbon spheres/gold hybrids as sensing platform and gold/ferrocene as signal amplifier

Sandwich-type electrochemical immunosensing of Hypopharyngeal carcinoma biomarker carcinoembryonic antigen based on N-doped hollow mesoporous nanocarbon spheres/gold hybrids as sensing platform and gold/ferrocene as signal amplifier

Spray‐n‐Sense: Sprayable Nanofibers for On‐Site Chemical Sensing

“Switch-Off-On” Detection of Fe3+ and F− Ions Based on Fluorescence Silicon Nanoparticles and Their Application to Food Samples

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