Fluorescent nanoprobes for sensing and imaging of metal ions: recent advances and future perspectives.

Ultrasonic assisted dispersive liquid-liquid microextraction method based on deep eutectic solvent for speciation, preconcentration and determination of selenium species (IV) and (VI) in water and food samples.

This review covers publications from the second half of 2016 to the middle of 2017. Techniques and applications relevant to clinical and biological materials, foods and beverages are discussed in the text, presenting the key aspects of the work referenced, while the tables provide a summary of the publications considered. Further to the observations made in the 2017 Update, we have noted the increase in publications featuring nanomaterials. Topics relate to exposure and absorption of nanoparticles; potential toxicity, use as reagents in analytical methods and the analysis or characterisation of these materials. A growing number of techniques are being applied to bio-imaging. In particular, those involving XRF spectrometry are being applied to a large range of biological sample types. A gradual trend during recent years, that is now quite apparent, has been the increasing proportion of publications that involve foods and beverages compared with clinical samples. Not necessarily related, but another trend is the growing number of reports from laboratories in the Republic of China.

Atomic spectrometry update: review of advances in the analysis of clinical and biological materials, foods and beverages

New procedures for arsenic speciation: A review

This is the eighth Atomic Spectrometry Update (ASU) to focus on advances in elemental speciation and covers a period of approximately 12 months from December 2014. This ASU review deals with all aspects of the analytical atomic spectrometry speciation methods developed for: the determination of oxidation states; organometallic compounds; coordination compounds; metal and heteroatom-containing biomolecules, including metalloproteins, proteins, peptides and amino acids; and the use of metal-tagging to facilitate detection via atomic spectrometry. The review does not cover fractionation, which is sometimes termed operationally defined speciation. As with all ASU reviews the focus of the research reviewed includes those methods that incorporate atomic spectrometry as the measurement technique. However, because speciation analysis is inherently focused on the relationship between the metal(loid) atom and the organic moiety it is bound to, or incorporated within, atomic spectrometry alone cannot be the sole analytical approach of interest. For this reason molecular detection techniques are also included where they have provided a complementary approach to speciation analysis. As in previous years, As and Se speciation continues to dominate the current literature and there has also been an increase in the number of publications concerning solid state speciation. This is presumably due to the increase in the number of synchrotron facilities available and a greater awareness of their potential for speciation studies.

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Atomic Spectrometry Update: review of advances in elemental speciation

A novel and sensitive selenium speciation in cultivated ginger rhizomes was developed using capillary electrophoresis coupled with electrothermal atomic absorption spectrometry. Influencing parameters were experimentally investigated. Under optimal conditions, SeMet, SeCys2, SeIV, and SeVI were completely separated when using capillary electrophoresis electrothermal atomic absorption spectrometry. Detection limits of SeMet, SeCys2, SeIV, and SeVI were 1.7, 2.2, 0.89, and 0.97 ng mL−1, respectively. The recoveries ranged from 95.6% to 104%. The RSD of peak height was observed to be smaller than 5%. When selenium enrichment was used on ginger, SeMet, SeIV, and SeVI could be detected in the first month; in the second month, the concentration of SeCys2, as well as the concentrations of SeMet, SeIV, and SeVI, could be determined. Ginger absorbs SeO32− and SeO42− at different rates; they could be converted into the organic selenium species.

Selenium speciation in ginger using capillary electrophoresis online coupled with electrothermal atomic absorption spectrometry

Interface of on line coupling capillary electrophoresis with hydride generation electrothermal atomic absorption spectrometry and its application to arsenic speciation in sediment.

A new method for studying the interaction of lead(II) and DNA was developed using capillary electrophoresis online coupled with electrothermal atomic absorption spectrometry. Under optimized experimental conditions, the detection limit (3σ) for Pb(II) was observed to be 1.8 × 10−6 mol L−1 by running 10 replicates of the reagent blank. The relative standard deviation (RSD, n = 5) of 0.5 × 10−4 mol L−1 was calculated as 3.4%. The primary binding number (n1) and binding constant (K1) of Pb(II)–DNA were observed as 0.57 and 6.2 × 104 L mol−1, respectively. The non-specific binding number (n2) and binding constant (K2) of Pb(II) and DNA were found to be 1.1 and 1.9 × 104 L mol−1, respectively. This new method allows the rapid analysis of a small amount of sample in a simple way, while it also prevents long periods of dialysis and eliminates the interferences from other metal ions. It thus provides a reliable and convenient new way to study the interactions between metal ions and biomolecules.

Determination of the binding sites and binding constants between Pb(II) and DNA using capillary electrophoresis combined with electrothermal atomic absorption spectrometry

Xiangdong Qin

Papers

Selenium speciation in ginger using capillary electrophoresis online coupled with electrothermal atomic absorption spectrometry

Interface of on line coupling capillary electrophoresis with hydride generation electrothermal atomic absorption spectrometry and its application to arsenic speciation in sediment.

Determination of the binding sites and binding constants between Pb(II) and DNA using capillary electrophoresis combined with electrothermal atomic absorption spectrometry