Novel approaches for selenium speciation in foodstuffs and biological specimens: A review

Pedrero, Zoyne; Madrid, Yolanda

doi:10.1016/j.aca.2008.12.026

Cited by 244 publications

(179 citation statements)

References 189 publications

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“…The threshold concentration for toxicity depends, among other factors, on the vegetal organism and the chemical form through which Se is conveyed. In general, selenate is readily absorbed and transported within plants due to its similarity with sulphate; on the other hand, selenite is faster transformed into selenoaminoacids (Pedrero and Madrid 2009). Some of the Se-organic compounds identified in plant tissues are: selenomethionine, selenocysteine, selenocystathione, selenomethylselenomethionine, selenomethylselenocysteine, s e l e n o h o m o c y s t e i n e a n d g a m m a -g l u t a m y lselenomethylselenocysteine (Terry et al 2000;Sors et al 2005).…”

Section: Introductionmentioning

confidence: 99%

“…Still, it is currently accepted that Se bioavailability, intake and metabolism are heavily dependent on its chemical forms (Finley 2006;Thiry et al 2012;Kieliszek and Błażejak 2013), which can be organic, such as selenoaminoacids, Se-methyled forms and complex selenoproteins, or inorganic, such as selenite (Se IV ) and selenate (Se VI ) (Sager 2006;Pedrero and Madrid 2009). Selenium contents in grazing animals and plants are highly correlated with the available Se in soils (Durán et al 2013), therefore many countries feature an average Se intake that is insufficient to achieve an adequate activity of protective selenoenzymes.…”

Section: Introductionmentioning

confidence: 99%

“…Selenocysteine and selenomethionine can replace their sulphur analogues into the proteins, which may lead to phytotoxicity. However, selenomethylselenocysteine is a nonproteinogenic selenoaminoacid, which has been identified in plants that exhibit quite a tolerance to selenium (Pedrero and Madrid 2009). …”

Section: Introductionmentioning

confidence: 99%

“…Several actions need to be performed in speciation studies: sample treatment, species separation and species identification. The first step-sample treatment-is intended to quantitatively extract species preventing their interconversion (Pedrero and Madrid 2009), that is obviously a major drawback in speciation at large. In the particular case of Se, enzymatic hydrolysis (using non-specific proteases) is the preferred method, its main advantages being mild conditions and selectivity (Seppänen et al 2010).…”

Section: Introductionmentioning

confidence: 99%

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Characterization of selenium-enriched wheat by agronomic biofortification

et al. 2014

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Agronomic biofortification of staple crops is an effective way to enhance their contents in essential nutrients up the food chain, with a view to correcting for their deficiencies in animal or human status. Selenium (Se) is one such case, for its uneven distribution in the continental crust and, therefore, in agricultural lands easily translates into substantial variation in nutritional intakes. Cereals are far from being the main sources of Se on a content basis, but they are likely the major contributors to intake on a dietary basis. To assess their potential to assimilate and biotransform Se, bread and durum wheat were enriched with Se through foliar and soil addition at an equivalent field rate of 100 g of Se per hectare (ha), using sodium selenate and sodium selenite as Se-supplementation matrices, in actual field conditions throughout. Biotransformation of inorganic Se was evaluated by using HPLC−ICP-MS after enzymatic hydrolysis for Se-species extraction in the resulting mature wheat grains. Selenomethionine and Se VI were identified and quantified: the former was the predominant species, representing 70-100 % of the total Se in samples; the maximum amount of inorganic Se was below 5 %. These results were similar for both supplementation methods and for both wheat varieties. Judging from the present results, one can conclude that agronomic biofortification of wheat may improve the nutritional quality of wheat grains with significant amounts of selenomethionine, which is an attractive option for increasing the Se status in human diets through Se-enriched, wheat-based foodstuff.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterization of selenium-enriched wheat by agronomic biofortification

et al. 2014

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“…Speciation analysis of Se species, such as inorganic selenite (Se(IV)), inorganic selenate (Se(VI)), selenomethylselenocysteine (SeMSeCys), selenocystine (SeCys) and seleno-methionine (SeMet), using various instrumental techniques have been published in recent years [29][30][31][32][33].…”

Section: Speciation Of Sementioning

confidence: 99%

Recent advances in speciation analysis of mercury, arsenic and selenium

2012

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Mercury (Hg), arsenic (As) and selenium (Se) are ubiquitous in the environment and exist in a variety of species, which have great influence on their transport, bioaccumulation and toxicity. This review presents the recent research progress in speciation analysis of Hg, As, and Se, with emphasis on enhanced cold vapor generation as interface for liquid chromatography and atomic spectrometry, speciation of volatile species in gas phase, and isotope dilution technique to improve the precision and accuracy of speciation. Hyphenated techniques to characterize the complexes of Hg and As with phytochelatins and chromatographic separation coupled with multi-collector-inductively coupled plasma mass spectrometry to measure species-specific isotopic ratios, are also briefly discussed. Mercury (Hg) and arsenic (As) are among the most highly toxic elements for humans and ecosystems and can cause serious environmental and human health problems even at low concentrations [1,2]. Selenium (Se) is an "essential toxin" for human health. It has been recognized as an important antioxidant and anti-cancer element. However, Se can also pose negative impact such as defective skin and hair loss [3]. The adsorption/uptake, transport, bioaccumulation, metabolism and toxicity of these elements strongly depend on their chemical species present in environmental and biological samples. In the environment, one species can transform to another through chemical or biological processes. For example, in anaerobic sediments, sulfur-reducing or iron-reducing bacteria can methylate inorganic mercury into highly toxic methylmercury (MeHg) [4,5]. Therefore, speciation analysis of Hg, As and Se is of great importance in order to elucidate the biogeochemcal cycle and toxicology of these elements. Speciation analysis mainly involves chromatographic separation (gas chromatography (GC) or high performance liquid chromatography (HPLC)) hyphenated with element-specific spectrometry or molecular mass spectrometry. This review presents the recent advances in speciation analysis of Hg, As, and Se based on chromatographic separation, with emphasis on enhanced cold vapor generation (CVG) as interface for LC and atomic spectrometry, speciation of volatile Hg, As and Se in gas phase, and isotope dilution technique to improve the precision and accuracy of speciation. Hyphenated techniques to characterize the complexes of Hg and As with phytochelatins and chromatographic separation coupled with multi-collector-inductively coupled plasma mass spectrometry (MC-ICP-MS) to measure species-specific isotopic ratios, are also briefly introduced.

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Atomic Spectroscopy in Food AnalysisUpdate based on the original article by Scott A. Baker and Nancy J. Miller‐Ihli,Encyclopedia of Analytical Chemistry, © 2000, John Wiley & Sons, Ltd

Baker¹,

Miller-Ihli²,

Fodor

et al. 2012

Encyclopedia of Analytical Chemistry

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There are several reasons that can explain why food analysis is a topic of strong interest for a large number of institutes around the world. Consumer demands have increased toward healthier and safer food products produced in environment‐friendly conditions. Food manufacturers and food distribution companies have to improve their quality control (QC) of raw materials, manufacturing processes, and end‐products to provide safe, healthy, and high‐quality products at reasonable price. Evaluation of element (e.g. essential and toxic) contents is an important part of nutrition and health claims made on foods. The methods best suited to meet this task are atomic spectroscopic methods such as atomic absorption, atomic emission, and elemental mass spectrometry (MS). Methods commonly used in the generation of food composition data include flame atomic absorption spectrometry (FAAS), graphite furnace atomic absorption spectrometry (GFAAS), inductively coupled plasma atomic emission spectrometry (ICP/AES), and inductively coupled plasma mass spectrometry (ICP/MS). FAAS and ICP/AES offer similar detection limits (DLs) (ng mL −1 levels), whereas GFAAS and ICP/MS can provide sub‐ng mL −1 detection capability. The choice of a method often depends on detection capability, but ease of use, speed of analysis, and cost must also be considered. ICP/AES, ICP/MS, and more recently GF/AAS offer the advantage of providing simultaneous multielement measurements, making them well suited for the analysis of large numbers of elements in food samples. If one or a few elements are to be determined, less expensive atomic absorption spectrometry (AAS) methods might be more suitable. The most critical stage in the development of analytical methods is sample preparation. Samples can be prepared using numerous procedures, but the most useful for a wide range of analytes and sample matrices are based on wet ashing of the sample. In addition to total element determinations, speciation measurements are important to determine the exact chemical form of the element that is present in the sample. As important properties, such as the bioavailability of an element, are dependent on its chemical form (speciation), the development of reliable methods for identification and quantification of trace element species is critical. The most practical difficulty encountered in speciation is to preserve the integrity of the sample and the species of interest during sampling, storage, and sample preparation. Hyphenated techniques, such as the coupling of chromatographic separation and atomic spectroscopic detection, have proven useful for elemental speciation measurements.

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Novel approaches for selenium speciation in foodstuffs and biological specimens: A review

Cited by 244 publications

References 189 publications

Characterization of selenium-enriched wheat by agronomic biofortification

Characterization of selenium-enriched wheat by agronomic biofortification

Recent advances in speciation analysis of mercury, arsenic and selenium

Atomic Spectroscopy in Food AnalysisUpdate based on the original article by Scott A. Baker and Nancy J. Miller‐Ihli,Encyclopedia of Analytical Chemistry, © 2000, John Wiley & Sons, Ltd

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