Topic
Selenium
About: Selenium is a research topic. Over the lifetime, 21192 publications have been published within this topic receiving 429715 citations. The topic is also known as: Se & selen.
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TL;DR: Chen et al. as mentioned in this paper discussed the importance of electron-transfer reactions in the literature and the present research emphasis is devoted toward understanding these fundamental processes, including electron transfer reactions.
Abstract: The importance of electron-transfer reactions is clearly indicated by the extensive literature describing this field and the present research emphasis devoted toward understanding these fundamental processes.1 The intricacies of electron-transfer reactions have been vigorously examined experimentally and theoretically for over 40 years.2·3 Because of continuing, intensive effort, fundamental aspects of these vital processes are still being elaborated. Disciplines Chemistry Comments Reprinted (adapted) with permission from Chemical Reviews 93 (1993): 1125, doi:10.1021/cr00019a012. Copyright 1993 American Chemical Society. This article is available at Iowa State University Digital Repository: http://lib.dr.iastate.edu/ameslab_pubs/363 Chen!. Rev. 1113, 93, 1125-1136 1125 Intermetal Oxygen, Sulfur, Selenium, and Nitrogen Atom Transfer Reactions
99 citations
TL;DR: Aluminum-based WTR could play a favorable role in sequestering excess Se in affected water sources and may be able to adsorb excess environmental selenium.
99 citations
TL;DR: Investigation of the mechanism by which selenate exhibits insulin-mimetic properties in two different insulin responsive cell types found that two proteins associated with the insulin signal cascade, the beta-subunit of the insulin receptor and IRS-1, increased in tyrosyl phosphorylation in the presence of selenium.
99 citations
TL;DR: Results obtained for Brazil nuts by size-exclusion chromatography with on-line ICP–MS detection, in the absence and in the presence of β-mercaptoethanol, showed that approximately 12% of total selenium was weakly bound to proteins.
Abstract: In addition to determination of total selenium in nuts, the element distribution among different fractions (lipid extract, low molecular weight, and protein fractions), and speciation analysis were studied. Improved precision for total selenium determination was observed after elimination of lipids. Because selenium was not detected in any of the lipid extracts obtained from the different types of nuts (ICP–MS), in each determination and/or speciation procedure used in this work lipids were extracted (chloroform–methanol, 2:1) and discarded before analysis. In agreement with previously reported data, high selenium levels were found in Brazil nuts (those purchased without shells contained approximately a quarter the content than those purchased with shells) and significantly lower levels in walnuts, cashews, and pecans nuts. Low-molecular-weight compounds were extracted with perchloric acid (0.4 mol L–1) to furnish a fraction containing 3 to 15% of the total selenium in different types of nuts. The proteins were isolated from nut samples by dissolution in 0.1 mol L–1 sodium hydroxide and subsequent precipitation with acetone. They were then dissolved in phosphate buffer pH 7.5. Analysis of protein fractions focused on selenium in two possible states – weakly and firmly bound to proteins. Results obtained for Brazil nuts by size-exclusion chromatography with on-line ICP–MS detection, in the absence and in the presence of β-mercaptoethanol, showed that approximately 12% of total selenium was weakly bound to proteins. To obtain information about firmly bound selenium, the protein extracts were hydrolyzed enzymatically with proteinase K. Speciation was performed by means of ion-pairing HPLC–ICP–MS. The primary species found in all types of nuts was Se-methionine (19–25% of total selenium for different types of nuts).
99 citations
Journal Article•
99 citations