Mercury in saliva and scalp hair from dental amalgam

Pigatto, Paolo D.; Minoia, Claudio; Ronchi, A.; Guzzi, Gianpaolo

doi:10.1016/j.jhazmat.2010.03.065

Cited by 4 publications

(2 citation statements)

References 15 publications

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“…10 It is hypothesized that Hg 0 vapors emitted from amalgams are first converted to Hg 2+ and then transformed to CH 3 Hg + by oral bacteria. 11 Hence, the detection of mercury in several matrices including human saliva is an indispensable task. 12 The commonly used techniques used for mercury detection include cold-vapor atomic absorption spectroscopy, 13 atomic fluorescence spectrometry, 14 and inductively coupled plasma spectrometry.…”

Section: Introductionmentioning

confidence: 99%

An oligonucleotide-functionalized carbon nanotube chemiresistor for sensitive detection of mercury in saliva

Wordofa

Ramnani

Tran

et al. 2016

Analyst

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Divalent mercuric (Hg(2+)) ion and monomethyl mercury (CH3Hg(+)) are two forms of mercury that are known to be highly toxic to humans. In this work, we present a highly selective, sensitive and label-free chemiresistive biosensor for the detection of both, Hg(2+) and CH3Hg(+) ions using DNA-functionalized single-walled carbon nanotubes (SWNTs). The SWNTs were functionalized with the capture oligonucleotide, polyT, using a linker molecule. The polyT was hybridized with polyA to form a polyT:polyA duplex. Upon exposure to mercury ions, the polyT:polyA duplex dehybridizes and a T-Hg(2+)-T duplex is formed. This structure switch leads to the release of polyA from the SWNT surface and correspondingly a change in the resistance of the chemiresistive biosensor is observed, which is used to quantify the mercury ion concentration. The biosensor showed a wide dynamic range of 0.5 to 100 nM for the detection of CH3Hg(+) ions in buffer solution with a sensitivity of 28.34% per log (nM) of CH3Hg(+). Finally, real world application of the biosensor was demonstrated by the detection of Hg(2+) and CH3Hg(+) ions in simulated saliva samples spiked with a known concentration of mercury ions.

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Section: Introductionmentioning

confidence: 99%

An oligonucleotide-functionalized carbon nanotube chemiresistor for sensitive detection of mercury in saliva

Wordofa

Ramnani

Tran

et al. 2016

Analyst

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“…So, it is significant and necessary to develop new methods for the enrichment of mercury in some special samples before analysis [22][23][24][25]. Normally, the level of mercury in human saliva is low and the reports about mercury analysis in human saliva were very scarce [26,27]. Saliva is viscous since it contains proteins.…”

Section: Introductionmentioning

confidence: 99%

Ultrasensitive determination of mercury in human saliva by atomic fluorescence spectrometry based on solidified floating organic drop microextraction

2012

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We report on a new, rapid and simple method for the determination of ultra-trace quantities of mercury ion in human saliva. It is based on solidified floating organic drop microextraction and detection by cold vapor atomic fluorescence spectrometry (CV-AFS). Mercury ion was complexed with diethyldithiocarbamate, and the hydrophobic complex was then extracted into fine droplets of 1-undecanol. By cooling in an ice bath after extraction, the droplets in solution solidify to form a single ball floating on the surface of solution. The solidified microdrop containing the mercury complex was then transferred for determination by CV-AFS. The effects of pH value, concentration of chelating reagent, quantity of 1-undecanol, sample volume, equilibration temperature and time were investigated. Under the optimum conditions, the preconcentration of a 25-mL sample is accomplished with an enrichment factor of 182. The limit of detection (3σ) is 2.5 ng L −1 . The relative standard deviation for seven replicate determinations at 0.

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Speciated organic mercury, scalp hair, and biomonitoring of exposure to thimerosal-containing vaccines

Pigatto

Guzzi

2012

Clinica Chimica Acta

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Mercury in saliva and scalp hair from dental amalgam

Cited by 4 publications

References 15 publications

An oligonucleotide-functionalized carbon nanotube chemiresistor for sensitive detection of mercury in saliva

An oligonucleotide-functionalized carbon nanotube chemiresistor for sensitive detection of mercury in saliva

Ultrasensitive determination of mercury in human saliva by atomic fluorescence spectrometry based on solidified floating organic drop microextraction

Speciated organic mercury, scalp hair, and biomonitoring of exposure to thimerosal-containing vaccines

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