Using L‐Arginine‐Functionalized Gold Nanorods for Visible Detection of Mercury(II) Ions

Guan, Jiehao; Wang, Yicheng; Gunasekaran, Sundaram

doi:10.1111/1750-3841.12811

Cited by 35 publications

(13 citation statements)

References 45 publications

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“…Alginate is a non-toxic, biocompatible, and inexpensive polysaccharide; it is widely used in pharmaceutical and biomedical applications (Boland et al 2007;Xu et al 2010). The AuNPs are highly biocompatible and possess distinct surface plasmon properties (Bagci et al 2015;Ghosh et al 2008;Guan et al 2015;Lu et al 2016;Wang et al 2015b;Wei et al 2015;Zhang et al 2015). Furthermore, our results indicate, contrary to Einstein-Batchelor viscosity law, that in situ synthesis of AuNPs in alginate solution lowers its viscosity, as had been reported for some other polymeric solutions with nanoparticles addition (Jain et al 2008;Mangal et al 2015).…”

Section: Introductionsupporting

confidence: 76%

Biopolymer/gold nanoparticles composite plasmonic thermal history indicator to monitor quality and safety of perishable bioproducts

Wang

Lü

Gunasekaran

2017

Biosensors and Bioelectronics

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Quality and safety of perishable products such as foods, pharmaceutics, and biologicals is a constant concern. We have developed a plasmonic thermal history indicator (THI) taking advantage of the localized surface plasmon resonance of gold nanoparticles (AuNPs) synthesized in situ in alginate, a natural polysaccharide. The color of the THIs becomes more intense with increased storage temperature and/or duration, with the color changing from grey to red with time of exposure at high temperature (40°C). The results suggest that decreasing viscosity with increasing number of AuNPs being synthesized in the system, along with aggregation of newly synthesized AuNPs onto larger ones and their settling are potentially responsible for the distinct color change observed. The use of alginate in the THIs also facilitates fabricating them as solid hydrogel matrices by adding divalent calcium ions. This alginate-AuNPs THI system is tunable by altering its composition to suit different time-temperature monitoring scenarios and the color-change reaction is irreversible. The THI provides a convenient, reliable, safe, and inexpensive means for tracking the thermal history of perishable products without the need for a read-out device.

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Section: Introductionsupporting

confidence: 76%

Biopolymer/gold nanoparticles composite plasmonic thermal history indicator to monitor quality and safety of perishable bioproducts

Wang

Lü

Gunasekaran

2017

Biosensors and Bioelectronics

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“…Gold nanoparticles (AuNPs) have received considerable attention due to their remarkable chemical and physical properties such as high biocompatibility, good chemical stability, large surface‐area‐to‐volume ratio, and distinct surface plasmon properties (Jans and Huo ; Guan and others ; Wang and others ). Hence, they are widely used in biotechnological and biomedical applications such as catalysis (Daniel and Astruc ), sensors (Saha and others ), diagnostics, drug delivery, and molecular imaging (Dykman and Khlebtsov ).…”

Section: Introductionmentioning

confidence: 99%

A Simple and Green Route for Room‐Temperature Synthesis of Gold Nanoparticles and Selective Colorimetric Detection of Cysteine

Bagci

Wang

Gunasekaran

2015

Journal of Food Science

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Gold nanoparticles (AuNPs) were synthesized at room temperature following a simple, rapid, and green route using fresh-squeezed apple juice as a reducing reagent. The optimal AuNPs, based on the particle color, stability, and color change suitable for colorimetric detection of cysteine (Cys), are synthesized using 5 mL of 10% apple juice, 1 mL of 10 mM gold precursor solution, and 1 mL of 0.1 M NaOH. Under this set of parameters, the AuNPs are synthesized within 30 min at room temperature. The average size (11.1 ± 3.2 nm) and ζ potential (-36.5 mV) of the AuNPs synthesized were similar to those of AuNPs prepared via the conventional citrate-reduction method. In the presence of Cys, unlike with any other amino acid, the AuNPs aggregated, possibly due to the gold-sulfur covalent interaction, yielding red-to-purple color change of the sample solution. The red-shift of the localized surface plasmon resonance peak of the AuNPs responsible for the color change was recorded by UV-vis spectrometer. The effect of other potential interferents such as glucose, ascorbic acid, K(+) , Na(+) , Ca(2+) , Zn(2+) , Ag(+) , Ni(2+) , Cu(2+) , Co(2+) , and Hg(2+) were also examined. The results show that AuNPs can be used to selectively detect and measure Cys with a linear dependency in the range of 2 to 100 μM and a limit of detection (signal-to-noise ratio > 3) of 50 nM. The results suggest that the green-synthesized AuNPs are useful for simple, rapid, and sensitive colorimetric detection of Cys, which is an essential amino acid in food and biological systems.

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“…Also, those techniques usually costly and available in a specialized research laboratory needs highly personnel trained and laborious. Recently, advanced methods used to detect the presence of mycotoxins in food samples, which show high sensitivity, low cost, simple operation, and portable on-field use [9]. Besides, portable and easy-to-use biosensor devices suitable for express, in-field detection of mycotoxins.…”

Section: Introductionmentioning

confidence: 99%

Recent Biosensors Technologies for Detection of Mycotoxin in Food Products

Rovina¹,

Shaeera²,

Vonnie³

et al. 2020

Mycotoxins and Food Safety

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Mycotoxins are chemically diverse and capable of inducing a wide diversity of acute and chronic symptoms, ranging from feed refusal to rapid death. Accurate detection and monitoring of mycotoxins is an essential component of the prevention, diagnosis, and remediation of mycotoxin-related issues in livestock and human food. Current trends in food analysis are focusing on the application of fast, simple procedure needed, and low-cost biosensor technologies that can detect with high sensitivity and selectivity different compounds associated with food safety. This chapter discussed the recent analytical methods-based biosensor technology for quantification of mycotoxins in food products. Mainly focus on the biosensor technology based on the immobilization of antibodies onto various nanomaterials such as nanoparticles, graphite, carbon nanotubes, and quantum dots. The nanomaterials are able to be functionalized with various biomolecules such as enzymes, antibodies, nucleic acids, DNA/RNA aptamers, bio-or artificial receptors that make them suitable for detection of various substances such as food toxins, bacteria, and other compounds important in food analysis. All the nanomaterials provide an effective platform for achieving high sensitivity that is similar and, in some cases, even better than conventional analytical methods. We believe that future trends will be emphasized on improving biosensor properties toward practical application in the food industry.

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Using L‐Arginine‐Functionalized Gold Nanorods for Visible Detection of Mercury(II) Ions

Cited by 35 publications

References 45 publications

Biopolymer/gold nanoparticles composite plasmonic thermal history indicator to monitor quality and safety of perishable bioproducts

Biopolymer/gold nanoparticles composite plasmonic thermal history indicator to monitor quality and safety of perishable bioproducts

A Simple and Green Route for Room‐Temperature Synthesis of Gold Nanoparticles and Selective Colorimetric Detection of Cysteine

Recent Biosensors Technologies for Detection of Mycotoxin in Food Products

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