Chitosan-functionalized gold nanoparticles for colorimetric detection of mercury ions based on chelation-induced aggregation

Colorimetric Detection of Hg2+ Based on Enhancement of Peroxidase‐like Activity of Chitosan‐Gold Nanoparticles

“…TMB is oxidized by hydrogen peroxide (H 2 O 2 ) in the presence of catalysts (Scheme 1(a))-here, the colorless solution changes to blue. 12,36 Considering the complex reaction between Hg 2+ and amino groups on the chitosan, we hypothesized that Hg 2+ might affect the peroxidase-like activity of CS-AuNPs. The results confirmed the peroxidase-like activity of CS-AuNPs.…”

“…12 We then detected the status of AuNPs in the Figure S4(a) indicate that the absorbance peak at 524 nm decreased upon addition of 0.04 μM Hg 2+ along with appearance of a new peak at 648 nm. 12 We then detected the status of AuNPs in the Figure S4(a) indicate that the absorbance peak at 524 nm decreased upon addition of 0.04 μM Hg 2+ along with appearance of a new peak at 648 nm.…”

“…Various sensors have been prepared for Hg 2+ analysis based on fluorescence, 4,5 electrochemical methods, 6 surface-enhanced Raman scattering (SERS), 7,8 inductively coupled plasma mass spectrometry (ICP-MS), 9 and colorimetric tools. [12][13][14][15] However, most of these assays are insensitive or have a complicated method for sample preparation. Colorimetric-sensing tools for Hg 2+ have been widely reported-especially those based on the aggregation or antiaggregation of noble metal nanoparticles.…”

Simple and sensitive colorimetric sensing of Cd2+ ion using chitosan dithiocarbamate functionalized gold nanoparticles as a probe

“…Most recently, Jiang et al described the use of unmodified Au NPs as a colorimetric probe for the recognition of Cd 2+ ion in water and rice samples [30]. Recent years, few attempts have been made to obtain stable Au and Ag NPs through surface functionalization with chitosan for colorimetric detection of Hg 2+ ion [31] in environmental and glucose [32] in biological samples. These reports inspired us to functionalize Au NPs with chitosan dithiocarbamate (CSDTC-Au NPs) for the selective colorimetric detection of metal ions.…”

Colorimetric Method for the Detection of Mercury Ions Based on Gold Nanoparticles and Mercaptophenyl Boronic Acid

“…Although traditional methods such as atomic absorption/emission spectrometry and inductively coupled plasma-mass spectrometry (ICP-MS) provide high sensitivity and selectivity for the detection of Hg 2+ ions, these methods suffer from the need for expensive, sophisticated instrumentation and time-consuming sample preparation processes. 6,7 Alternatively, many electrochemical and optical sensing systems capable of providing real-time Hg 2+ determination with reduced analysis time and cost have been developed, based on organic fluorophores, 9 oligonucleotides, [10][11][12][13] proteins, 14,15 polymers, 16 metal nanoparticles, [17][18][19][20] semiconductor quantum dots, [21][22][23] graphene oxide, 24 single-walled carbon nanotubes 25 and so on. Among these methods, colorimetric methods are extremely attractive because the results can be easily read out with the naked eye in some cases at the point of use.…”