selenium analysis
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2018 ◽  
Vol 640-641 ◽  
pp. 1635-1651 ◽  
Author(s):  
Kelly L. LeBlanc ◽  
Paramee Kumkrong ◽  
Patrick H.J. Mercier ◽  
Zoltán Mester
Keyword(s):  

2018 ◽  
Vol 640-641 ◽  
pp. 1611-1634 ◽  
Author(s):  
Paramee Kumkrong ◽  
Kelly L. LeBlanc ◽  
Patrick H.J. Mercier ◽  
Zoltán Mester

Nutrients ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1466 ◽  
Author(s):  
Diana Constantinescu-Aruxandei ◽  
Rodica Frîncu ◽  
Luiza Capră ◽  
Florin Oancea

Selenium is essential for humans and the deficit of Se requires supplementation. In addition to traditional forms such as Se salts, amino acids, or selenium-enriched yeast supplements, next-generation selenium supplements, with lower risk for excess supplementation, are emerging. These are based on selenium forms with lower toxicity, higher bioavailability, and controlled release, such as zerovalent selenium nanoparticles (SeNPs) and selenized polysaccharides (SPs). This article aims to focus on the existing analytical systems for the next-generation Se dietary supplement, providing, at the same time, an overview of the analytical methods available for the traditional forms. The next-generation dietary supplements are evaluated in comparison with the conventional/traditional ones, as well as the analysis and speciation methods that are suitable to reveal which Se forms and species are present in a dietary supplement. Knowledge gaps and further research potential in this field are highlighted. The review indicates that the methods of analysis of next-generation selenium supplements should include a step related to chemical species separation. Such a step would allow a proper characterization of the selenium forms/species, including molecular mass/dimension, and substantiates the marketing claims related to the main advantages of these new selenium ingredients.


2017 ◽  
Vol 15 (1) ◽  
pp. 103-122 ◽  
Author(s):  
Ahmed S. A. Ibrahim ◽  
Radwan Al-Farawati ◽  
Usama Hawas ◽  
Yasser Shaban

AbstractResearch designed to improve extraction has led to the development of microextraction techniques (ME), which involve simple, low cost, and effective preconcentrationof analytes in various matrices. This review is concerned with the principles and theoretical background of ME, as well as the development of applications for selenium analysis during the period from 2008 to 2016. Among all ME, dispersive liquid-liquid microextraction was found to be most favorable for selenium. On the other hand, atomic absorption spectrometry was the most frequently used instrumentation. Selenium ME have rarely been coupled to spectrophotometry and X-ray spectrophotometry methods, and there is no published application of ME with electrochemical techniques. We strongly support the idea of using a double preconcentration process, which consists of microextraction prior to preconcentration, followed by selenium determination using cathodic stripping voltammetry (ME-CSV). More attention should focus on the development of accurate, precise, and green methods for selenium analysis.


2015 ◽  
Vol 31 (1) ◽  
pp. 171-176 ◽  
Author(s):  
Nunticha Limchoowong ◽  
Pornpimon Tan-Umporn ◽  
Lampaen Laijungred ◽  
Suchila Techawongstein ◽  
Saksit Chanthai

2015 ◽  
Vol 5 ◽  
pp. 1-7 ◽  
Author(s):  
Maurizio Pettine ◽  
Thomas J. McDonald ◽  
Mary Sohn ◽  
George A.K. Anquandah ◽  
Radek Zboril ◽  
...  

2015 ◽  
Vol 30 (5) ◽  
pp. 1179-1183 ◽  
Author(s):  
Brian P. Jackson ◽  
Amir Liba ◽  
Jenny Nelson

Recent reports of As concentrations in certain food and drinks have garnered public concern and led to a lowering of the US guideline maximum concentration for inorganic As in apple juice and proposed limits for As in rice products.


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