Electrochemical quantification of Ag2S quantum dots: evaluation of different surface coating ligands for bacteria determination

Amor-Gutiérrez, Olaya; Iglesias-Mayor, Alba; Llano-Suárez, Pablo; Costa‐Fernández, José M.; Soldado, A.; Podadera, Ana; Parra, Francisco; Costa-Garcı́a, Agustı́n; Escosura‐Muñiz, Alfredo de la

doi:10.1007/s00604-020-4140-z

Cited by 12 publications

(9 citation statements)

References 37 publications

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“…While the characterisation of synthesised QDs is widely covered in the literature, the research on the detection or quantification of QDs in complex samples is much more unusual. Thus, the detection/determination of QDs both directly (as inorganic or metal-free materials) [ 7 , 188 , 189 , 190 , 191 , 192 , 193 ] and indirectly (as the heavy metal content of inorganic materials) has been reported [ 11 , 12 , 54 , 56 , 194 , 195 , 196 , 197 , 198 , 199 , 200 , 201 , 202 , 203 , 204 , 205 , 206 , 207 , 208 , 209 , 210 ]. Nevertheless, for the indirect determination to be successful, the nature of the sample must be ensured; otherwise, the heavy metal content could come from sources other than the QDs themselves.…”

Section: Analytical Techniques For Detection and Quantification Of Qdsmentioning

confidence: 99%

“…As depicted in Figure 8 , voltammetric-sensing techniques [ 12 , 54 , 194 , 200 , 201 , 203 , 205 , 206 , 207 , 208 , 210 ] and mass spectrometry-related techniques [ 12 , 56 , 191 , 192 , 193 , 195 , 196 , 197 , 199 , 202 , 204 , 209 ] are commonly used analytical techniques for the detection/determination of QDs. Less used techniques are spectrofluorimetry [ 7 , 188 , 189 , 190 , 211 , 212 ] and others such as UV–Vis spectrophotometry or graphite furnace atomic absorption spectrometry (GFAAS) [ 142 , 194 , 213 , 214 ].…”

Section: Analytical Techniques For Detection and Quantification Of Qdsmentioning

confidence: 99%

“…The authors attribute this to the different nanocrystals’ absorption cross sections from different synthesis routes. ASV has been also applied for the determination of novel Ag 2 S QDs with two different surface coatings: 3–mercaptopropionic acid (MPA) and boronic acid (BA) [ 210 ]. The LODs achieved were 4.10 × 10 10 QDs mL −1 for MPA–Ag 2 S QDs and 5.70 × 10 10 QDs mL −1 for BA–Ag 2 S QDs, both with good precision and with a wide linear response range (10 9 to 10 12 QD mL −1 ).…”

Section: Analytical Techniques For Detection and Quantification Of Qdsmentioning

confidence: 99%

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Semiconductor Quantum Dots as Target Analytes: Properties, Surface Chemistry and Detection

et al. 2022

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Since the discovery of Quantum Dots (QDs) by Alexey I. Ekimov in 1981, the interest of researchers in that particular type of nanomaterials (NMs) with unique optical and electrical properties has been increasing year by year. Thus, since 2009, the number of scientific articles published on this topic has not been less than a thousand a year. The increasing use of QDs due to their biomedical, pharmaceutical, biological, photovoltaics or computing applications, as well as many other high-tech uses such as for displays and solid-state lighting (SSL), has given rise to a considerable number of studies about its potential toxicity. However, there are a really low number of reported studies on the detection and quantification of QDs, and these include ICP–MS and electrochemical analysis, which are the most common quantification techniques employed for this purpose. The knowledge of chemical phenomena occurring on the surface of QDs is crucial for understanding the interactions of QDs with species dissolved in the dispersion medium, while it paves the way for a widespread use of chemosensors to facilitate its detection. Keeping in mind both human health and environmental risks of QDs as well as the scarcity of analytical techniques and methodological approaches for their detection, the adaptation of existing techniques and methods used with other NMs appears necessary. In order to provide a multidisciplinary perspective on QD detection, this review focused on three interrelated key aspects of QDs: properties, surface chemistry and detection.

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Section: Analytical Techniques For Detection and Quantification Of Qdsmentioning

confidence: 99%

Section: Analytical Techniques For Detection and Quantification Of Qdsmentioning

confidence: 99%

Section: Analytical Techniques For Detection and Quantification Of Qdsmentioning

confidence: 99%

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Semiconductor Quantum Dots as Target Analytes: Properties, Surface Chemistry and Detection

et al. 2022

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“…[64] Similarly, β-glycosidase, an indicator of E. coli, was determined with an LOD of 0.01 U mL −1 . [63] Especially, aptamer-dependent sensors combining with QDs could reach extreme low detection limit to single cell level. [166,179] In addition, DNA could also be an indicator of the existence of bacteria.…”

Section: Electrostatic Interactions and Ros Generationmentioning

confidence: 99%

Quantum Dots for Pathogenic Bacterial Monitoring and Combating

Liu

Zhang

2022

Advanced Optical Materials

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including neonatal meningitis, [6] diarrhoea, [7] infected cutaneous wound [8] or bloodstream diseases, [9][10][11] etc. Antibiotic treatment strategies against these bacteria have been widely applied while antimicrobial resistance has been arousing gradually. [12][13][14][15][16][17] What is worse, the biofilmrelated infection has been a tough issue for bacterial infectious treatment since it is usually chronic and much harder to eradicate. [18][19][20] Therefore, effective antibacterial treatments for drug-resistant pathogenic bacteria are vital problems for clinical therapy. [21] Some anti-microbial trials were carried out like phages, bacteriocins, and antimicrobial peptides [22] along with various therapeutic methods. [23][24][25] Among them, nanomaterials are considered as compatible solutions [23,26] due to their facile synthesis methods and rich-sourced precursors, broad-spectrum sterilization, and low drug resistance. [27][28][29][30][31] Nanomaterials are generally easy to be modified or doped to enhance the affinity toward bacteria for the sake of combating or drug delivery. [32][33][34][35] The antibacterial mechanism [36,37] could be result from the sharp edges-based physical cutting, [38,39] photothermal effects, [40][41][42] and photo dynamic or chemical dynamic properties, that could produce reactive oxygen species (ROS).Pathogenic bacteria monitoring mainly conducted by culturing them in agar-based media, and subsequently testing them with biochemical probes. [43][44][45][46] Although this conventional method enables clinical diagnoses with relatively reliable outcomes, the long culturing time renders the "golden therapeutical window" for patients. So more rapid and accurate detecting technologies have been invented. One of the most evolutionary methods is the polymerase chain reaction, [47][48][49] which can identify the bacterial classification and provide gene expression level in a few hours with better accuracy. [47,50] Besides, the coupling of chromatography and mass spectra like matrix-assisted laser desorption ionization time-of-flight mass spectrometry [51][52][53][54][55] can play a more exact role in diagnosis. [56] Though these advanced instrumental-relied methods can lead to fast diagnostic, the expensive apparatus, environmentally unfriendly reagents, [57] professional sites and technical personnel requirements limited their utilization in real-time monitoring and point-of-care sensing. By contrast, easy and fast monitoring methods for the pathogen, such as electrochemical and fluorescence sensors, were brought out as powerful supplements. [58][59][60][61][62] Therein, Antibiotic resistance and pathogenic bacterial monitoring are two main challenges in clinical diagnostics and treatment of bacteria. To conquer those issues, many new materials and novel technologies are explored. Among them, quantum dots (QDs) are regarded as not only powerful bacteriostatic agents, but also bacterial monitoring probes due to their excellent photoluminescence properties, tunable multiwavelength lumine...

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“…Zhang et al [ 128 ] have reported an electrochemical biosensor for detecting clenbuterol antibody based on ZnS quantum dots. Amor-Gutiérrez et al [ 129 ] have established an electrochemical biosensor for determination bacteria based on Ag 2 S quantum dots.…”

Section: Sulfur-containing Quantum Dotsmentioning

confidence: 99%

Biosensors Based on Advanced Sulfur-Containing Nanomaterials

Wang

Jiang

et al. 2020

Sensors

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In recent years, sulfur-containing nanomaterials and their derivatives/composites have attracted much attention because of their important role in the field of biosensor, biolabeling, drug delivery and diagnostic imaging technology, which inspires us to compile this review. To focus on the relationships between advanced biomaterials and biosensors, this review describes the applications of various types of sulfur-containing nanomaterials in biosensors. We bring two types of sulfur-containing nanomaterials including metallic sulfide nanomaterials and sulfur-containing quantum dots, to discuss and summarize the possibility and application as biosensors based on the sulfur-containing nanomaterials. Finally, future perspective and challenges of biosensors based on sulfur-containing nanomaterials are briefly rendered.

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Electrochemical quantification of Ag2S quantum dots: evaluation of different surface coating ligands for bacteria determination

Cited by 12 publications

References 37 publications

Semiconductor Quantum Dots as Target Analytes: Properties, Surface Chemistry and Detection

Semiconductor Quantum Dots as Target Analytes: Properties, Surface Chemistry and Detection

Quantum Dots for Pathogenic Bacterial Monitoring and Combating

Biosensors Based on Advanced Sulfur-Containing Nanomaterials

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