Intake of selenium by seniors of South Bohemia and urine selenium of seniors in the course of a 1-year supplementation by various selenium species

2008 ◽  
Vol 25 (01) ◽  
pp. 21-24 ◽  
Author(s):  
J. Kvicala ◽  
V. Zamrazil ◽  
J. Nemecek ◽  
M. Anke
Keyword(s):  
Selenium Species ◽  
Urine Selenium ◽  
South Bohemia

scholarly journals The activity of methylated and non-methylated selenium species in lymphoma cell lines and primary tumours

2006 ◽  
Vol 17 (5) ◽  
pp. 773-779 ◽  
Author(s):  
K. Last ◽  
L. Maharaj ◽  
J. Perry ◽  
S. Strauss ◽  
J. Fitzgibbon ◽  
...  
Keyword(s):  
Cell Lines ◽  
Lymphoma Cell ◽  
Selenium Species

Analytical methods for the quantification of selenium species in biological matrix: Where are we?

2021 ◽  
Vol 02 ◽  
Author(s):  
Rama Alhasan ◽  
Caroline Perrin-Sarrado ◽  
Claus Jacob ◽  
Caroline Gaucher
Keyword(s):  
Analytical Methods ◽  
Inductively Coupled Plasma ◽  
Hydride Generation ◽  
Essential Element ◽  
The Body ◽  
Cutting Edge ◽  
Emission Spectrometry ◽  
Atomic Fluorescence Spectrometry ◽  
Selenium Species ◽  
Inductively Coupled

Objective: Over the years, scientific investigations have proven the importance of selenium as an essential element for mammals, emphasizing its activity against many diseases and even its prophylactic effects. It is also established now that a malconsumption of selenium can be harmful. Therefore, the nature and the concentration of selenium and its derivatives found in the diet, the body, and even in the environment, for example, in the soil, should be determined carefully. Methods: In this review, analytical methods for speciation and determination of selenium concentrations in biological samples are summarized. Results: Methods ranging from routine to cutting-edge are explored, focusing on their analytical characteristics, such as specificity for discrete selenium species, sensitivity, accuracy, reproducibility, and skills required. Conclusion: There are already numerous studies regarding the analysis of selenium species. Beyond the method employed for actual measurements, we propose to review the preanalytic steps for sample handling in biological matrices, which directly affect results that will be more accurate with careful pretreatment. Furthermore, to reach better outcomes in terms of the identification of selenium species, different combinations of techniques might be the answer. We highlight here the last and the cutting-edge methods to identify and quantify selenium such as, high-performance liquid chromatography combined to inductively coupled plasma mass spectrometry (HPLC-ICP-MS), hydride generation atomic absorption spectrometry (HG-AAS), hydride-generation combined to atomic fluorescence spectrometry (HG-AFS), or to inductively coupled plasma optical emission spectrometry (HG-ICP-OES). This review emphasizes the importance of such investigations and the need to achieve reliable, safe, and effective quantification and methods of determination.

A Novel and Efficient Alkoxylselenenylation of Alkenes

2019 ◽  
Vol 41 (6) ◽  
pp. 1039-1039
Author(s):  
Yingguo Fang and Jie Yan Yingguo Fang and Jie Yan
Keyword(s):  
Room Temperature ◽  
Electrophilic Addition ◽  
New Method ◽  
Reaction Conditions ◽  
Selenium Species

A novel and efficient alkoxylselenenylation from alkenes, diselenides, and alcohols mediated by iodine is developed, with which a series of β-alkoxy selenides are synthesized. In this procedure, firstly, I2 reacts with diselenide to form in situ the active electrophilic selenium species RSeI, then following an electrophilic addition of it to alkenes provides β-alkoxy selenides with high regioselectivity and in good yields. This new method for achieving β-alkoxy selenides has some advantages over other methods such as using available and cheap iodine as the oxidizing species at room temperature, which makes this reaction has milder reaction conditions and simpler procedure.

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