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Selenium speciation in soils using flow injection hydride generation atomic absorption spectrometry with on-line removal of organic matter interferences. Talanta 2023; 253:123898. [PMID: 36108519 DOI: 10.1016/j.talanta.2022.123898] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Revised: 08/24/2022] [Accepted: 08/26/2022] [Indexed: 12/13/2022]
Abstract
A method based on flow injection hydride generation atomic absorption spectrometry (FI-HGAAS) with an on-line pre-reduction of Se(VI) to Se(IV) was developed and optimized to determine phosphate-extractable Se (0.1 M phosphate buffer KH2PO4/K2HPO4 at pH 7). The extracted fraction involves water-soluble Se (i.e. the most mobile Se fraction) and exchangeable Se (i.e. sorbed onto soil component surface). Kinetic discrimination mechanisms allowed the complete removal of interferences caused by organic matter due to the formation of humic substances (HS)-Se(IV) complexes observed when batch pre-reduction processes were used. Se(IV) and Se(VI) recoveries ranged 95-105% at a fortification level of 150 μg kg-1. The pre-reduction was efficiently carried out in 20 s in a 6 M HCl medium at 100 °C. Results from phosphate-extractable fractions were comparable to those obtained by ICP-MS. Se bound to organic matter was released digesting the remaining material from the phosphate buffer extraction with 0.1 M K2S2O8. Detection and quantification limits were 15 μg kg-1 Se and 50 μg kg-1 Se, respectively, in each fraction. The methodology was applied to 10 agricultural soils from Argentina with total Se concentration levels between 130 μg kg-1 and 419 μg kg-1.
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2
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Selenium and tellurium in the development of novel small molecules and nanoparticles as cancer multidrug resistance reversal agents. Drug Resist Updat 2022; 63:100844. [DOI: 10.1016/j.drup.2022.100844] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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3
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Borah P, Chetan, Sharma V, Malakar A, Bhinder SS, Kansal SK, Devi P. A Facile Method for Detection and Speciation of Inorganic Selenium with Ion Chromatography. Chromatographia 2022. [DOI: 10.1007/s10337-021-04120-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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4
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Estimation of daily selenium intake by 3- to 5-year-old Japanese children based on selenium excretion in 24-h urine samples. J Nutr Sci 2019; 8:e24. [PMID: 31428331 PMCID: PMC6683239 DOI: 10.1017/jns.2019.21] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2018] [Revised: 06/14/2019] [Accepted: 06/17/2019] [Indexed: 12/24/2022] Open
Abstract
To evaluate the daily Se intake of 3- to 5-year-old Japanese children, we used seventy-two urine samples collected from fifty-three children (twenty-seven male and twenty-six female) from two cities in Miyagi prefecture, Japan. For measuring low Se concentrations with high precision, accuracy and rapidity in the 24-h urine samples, we developed an instrumental neutron activation analysis (INAA) method, that is without any chemical separation, using the short-lived 77mSe (t1/2 = 17·4 s) nuclide. The estimated Se intake of the fifty-three children was 51·5 (sd 30·2) µg/d (geometric mean: 42·7 µg/d). Ten subjects (three male and seven female), successfully provided 24-h urine samples over two or three consecutive days; their Se intake was 37·4 (sd 5·9) µg/d. Based on the logarithmically transformed data of these ten subjects, the ratio of intra-/inter-individual variances of usual Se intake was 16·7 (28·0/1·7) and geometric mean was 27·7 µg/d. The 5th to 95th percentile of usual Se intake of these ten subjects was 17·5 to 40·4 µg/d, which ranged between the recommended dietary allowance and tolerable upper intake level of Se by the Dietary Reference Intakes for Japanese (2015).
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Liu Z, Wang Q, Zou D, Yang Y. Effects of selenite on growth, photosynthesis and antioxidant system in seaweeds, Ulva fasciata (Chlorophyta) and Gracilaria lemaneiformis (Rhodophyta). ALGAL RES 2018. [DOI: 10.1016/j.algal.2018.10.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Canady K, Cobb J, Deardorff P, Larson J, White JM, Boring D. Validation of a Stability-Indicating Method for Methylseleno-L-Cysteine (L-SeMC). J Chromatogr Sci 2015. [PMID: 26199341 DOI: 10.1093/chromsci/bmv100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Methylseleno-L-cysteine (L-SeMC) is a naturally occurring amino acid analogue used as a general dietary supplement and is being explored as a chemopreventive agent. As a known dietary supplement, L-SeMC is not regulated as a pharmaceutical and there is a paucity of analytical methods available. To address the lack of methodology, a stability-indicating method was developed and validated to evaluate L-SeMC as both the bulk drug and formulated drug product (400 µg Se/capsule). The analytical approach presented is a simple, nonderivatization method that utilizes HPLC with ultraviolet detection at 220 nm. A C18 column with a volatile ion-pair agent and methanol mobile phase was used for the separation. The method accuracy was 99-100% from 0.05 to 0.15 mg/mL L-SeMC for the bulk drug, and 98-99% from 0.075 to 0.15 mg/mL L-SeMC for the drug product. Method precision was <1% for the bulk drug and was 3% for the drug product. The LOQ was 0.1 µg/mL L-SeMC or 0.002 µg L-SeMC on column.
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Affiliation(s)
- Kristin Canady
- MRIGlobal, 425 Volker Boulevard, Kansas City, MO 64110, USA
| | - Johnathan Cobb
- MRIGlobal, 425 Volker Boulevard, Kansas City, MO 64110, USA
| | | | - Jami Larson
- MRIGlobal, 425 Volker Boulevard, Kansas City, MO 64110, USA
| | | | - Dan Boring
- The National Cancer Institute, 9609 Medical Center Drive, Room 5E536, Rockville, MD 20850, USA
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Kocot K, Leardi R, Walczak B, Sitko R. Determination and speciation of trace and ultratrace selenium ions by energy-dispersive X-ray fluorescence spectrometry using graphene as solid adsorbent in dispersive micro-solid phase extraction. Talanta 2014; 134:360-365. [PMID: 25618680 DOI: 10.1016/j.talanta.2014.11.036] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2014] [Revised: 11/13/2014] [Accepted: 11/18/2014] [Indexed: 01/03/2023]
Abstract
A dispersive micro-solid phase extraction (DMSPE) with graphene as a solid adsorbent and ammonium pyrrolidinedithiocarbamate (APDC) as a chelating agent was proposed for speciation and detemination of inorganic selenium by the energy-dispersive X-ray fluorescence spectrometry (EDXRF). In developed DMSPE, graphene particles are dispersed throughout the analyzed solution, therefore reaction between Se(IV)-APDC complexes and graphene nanoparticles occurs immediately. The concentration of Se(VI) is calculated as the difference between the concentration of selenite after and before prereduction of selenate. A central composite face-centered design with 3 center points was performed in order to optimize conditions and to study the effect of four variables (pH of the sample, concentration of APDC, concentration of Triton-X-100, and sample volume). The best results were obtained when suspension consisting of 200 µg of graphene nanosheets, 1.2 mg of APDC and 0.06 mg of Triton-X-100 was rapidly injected to the 50 mL of the analyzed solution. Under optimized conditions Se ions can be determined with a very good recovery (97.7±5.0% and 99.2±6.6% for Se(IV) and Se(VI), respectively) and precision (RSD=5.1-6.6%). Proposed DMSPE/EDXRF procedure allowed to obtain low detection limits (0.032 ng mL(-1)) and high enrichment factor (1013±15). The proposed methodology was successfully applied for the determination of Se in mineral, tap, lake and sea water samples as well as in biological materials (Lobster Hepatopancreas and Pig Kidney).
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Affiliation(s)
- Karina Kocot
- Institute of Chemistry, University of Silesia, 40-006 Katowice, Szkolna 9, Poland
| | - Riccardo Leardi
- Department of Pharmacy, Unit of Pharmaceutical and Food Chemistry and Technology, University of Genoa, Italy
| | - Beata Walczak
- Institute of Chemistry, University of Silesia, 40-006 Katowice, Szkolna 9, Poland
| | - Rafal Sitko
- Institute of Chemistry, University of Silesia, 40-006 Katowice, Szkolna 9, Poland.
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Tsai YN, Lin CH, Hsu IH, Sun YC. Sequential photocatalyst-assisted digestion and vapor generation device coupled with anion exchange chromatography and inductively coupled plasma mass spectrometry for speciation analysis of selenium species in biological samples. Anal Chim Acta 2013; 806:165-71. [PMID: 24331052 DOI: 10.1016/j.aca.2013.11.008] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2013] [Revised: 10/17/2013] [Accepted: 11/04/2013] [Indexed: 11/15/2022]
Abstract
We have developed an on-line sequential photocatalyst-assisted digestion and vaporization device (SPADVD), which operates through the nano-TiO2-catalyzed photo-oxidation and reduction of selenium (Se) species, for coupling between anion exchange chromatography (LC) and inductively coupled plasma mass spectrometry (ICP-MS) systems to provide a simple and sensitive hyphenated method for the speciation analysis of Se species without the need for conventional chemical digestion and vaporization techniques. Because our proposed on-line SPADVD allows both organic and inorganic Se species in the column effluent to be converted on-line into volatile Se products, which are then measured directly through ICP-MS, the complexity of the procedure and the probability of contamination arising from the use of additional chemicals are both low. Under the optimized conditions for SPADVD - using 1g of nano-TiO2 per liter, at pH 3, and illuminating for 80 s - we found that Se(IV), Se(VI), and selenomethionine (SeMet) were all converted quantitatively into volatile Se products. In addition, because the digestion and vaporization efficiencies of all the tested selenicals were improved when using our proposed on-line LC/SPADVD/ICP-MS system, the detection limits for Se(IV), Se(VI), and SeMet were all in the nanogram-per-liter range (based on 3σ). A series of validation experiments - analysis of neat and spiked extracted samples - indicated that our proposed methods could be applied satisfactorily to the speciation analysis of organic and inorganic Se species in the extracts of Se-enriched supplements.
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Affiliation(s)
- Yun-ni Tsai
- Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, 30013 Hsinchu, Taiwan
| | - Cheng-hsing Lin
- Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, 30013 Hsinchu, Taiwan
| | - I-hsiang Hsu
- Center for Measurement Standards, Industrial Technology Research Institute, 30011 Hsinchu, Taiwan
| | - Yuh-chang Sun
- Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, 30013 Hsinchu, Taiwan.
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Ivandini TA, Einaga Y. Electrochemical Detection of Selenium (IV) and (VI) at Gold-Modified Diamond Electrodes. Electrocatalysis (N Y) 2013. [DOI: 10.1007/s12678-013-0169-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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11
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Schiavon M, Moro I, Pilon-Smits EAH, Matozzo V, Malagoli M, Dalla Vecchia F. Accumulation of selenium in Ulva sp. and effects on morphology, ultrastructure and antioxidant enzymes and metabolites. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2012; 122-123:222-31. [PMID: 22858602 DOI: 10.1016/j.aquatox.2012.06.014] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2012] [Accepted: 06/24/2012] [Indexed: 05/07/2023]
Abstract
The impact of selenium (Se) on Ulva sp., a green macroalga naturally growing in the Venice Lagoon, was investigated. The alga was provided for 10 days with concentrations of selenate (Na(2)SeO(4)) ranging from 0 to 100 μM. Se accumulation in the algal biomass was linearly related to the selenate dose and this relationship was not affected by the high sulfate concentration measured in the seawater. The amount of Se measured in the alga was always relatively low and not hazardous to algal consumers. However, Se induced the formation of hydrogen peroxide (H(2)O(2)) in Ulva sp. and, as a result, the activity of antioxidant enzymes (superoxide dismutase, SOD, and catalase, CAT) and the amount of antioxidant metabolites (phenols, flavonoids and carotenoids) increased, even when selenate was supplied to the macroalga at low concentration (2.5 μM). This indicated that different components of the antioxidant defence system played a pivotal role in overcoming oxidative damage by Se in the macroalga, and explained the lack of morphological and ultrastructural alterations in Ulva sp. exposed to selenate.
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Sui M, Liu H, Ren Y, Liu D. Study on Zn relative concentration and state in sheep duodenum by XAFS. Biol Trace Elem Res 2011; 143:240-50. [PMID: 20848237 DOI: 10.1007/s12011-010-8843-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/17/2010] [Accepted: 09/02/2010] [Indexed: 11/26/2022]
Abstract
Synchrotron-based X-ray absorption fine structure (XAFS) spectroscopy is not widely used in animal science. The objective of this study was to employ the XAFS technique to determine changes in zinc absorption and concentrations in the sheep interstinal sac using different zinc sources. Forty-eight sheep were slaughtered and their duodena were dissected. The duodena were randomly assigned to six zinc sources (ZnO, ZnSO(4), ZnMet, ZnLys, ZnSO(4) + methionine, ZnSO(4) + lysine). Ten centimeters of duodenal sac midpiece was incubated for 40 min in vitro using the everted intestinal sac technique in culture medium containing zinc from different sources. The amount of zinc present was normalized to 4 mg. XAFS was used to analyze the relative concentration and oxidation state of zinc, and atomic absorption spectrometry (AAS) was used to verify zinc concentration. The results showed that, for increasing zinc concentrations, organic zinc was a better source than inorganic zinc. In addition, the zinc concentration achieved using ZnMet was higher than that for ZnO and ZnSO(4) (P < 0.05) as measured by atomic absorption spectroscopy. The results using XAFS were consistent with that of AAS. The states of organic zinc and inorganic zinc were identical after being incubated for 40 min. As observed in these experiments, organic zinc was more easily absorbed than inorganic zinc. Our data demonstrate that organic zinc was dissociated into ions and then absorbed as inorganic zinc. In our experiments, we are the first investigators to use XAFS spectroscopy to determine zinc absorption in the sheep duodenal wall. We observed reduced absorption of inorganic zinc in the presence of methionine or lysine. Taken together, we postulate that the optimal molar ratio of inorganic zinc and ligand requires further study.
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Affiliation(s)
- Meixia Sui
- Animal Nutrition Institute, Northeast Agricultural University, 150030 Harbin, Heilongjiang, China
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Leyva D, Estévez J, Montero A, Pupo I. Separation and determination of selenium in water samples by the combination of APDC coprecipitation: X-ray fluorescence spectrometry. J Radioanal Nucl Chem 2011. [DOI: 10.1007/s10967-011-1375-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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14
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Tolu J, Le Hécho I, Bueno M, Thiry Y, Potin-Gautier M. Selenium speciation analysis at trace level in soils. Anal Chim Acta 2011; 684:126-33. [DOI: 10.1016/j.aca.2010.10.044] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2010] [Revised: 10/05/2010] [Accepted: 10/31/2010] [Indexed: 11/27/2022]
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15
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Carvalhido JAE, Almeida AA, Araújo AN, Montenegro MCBSM. A reflectance flow-through thionine sol-gel sensor for the determination of Se(IV). ANAL SCI 2010; 26:665-9. [PMID: 20543497 DOI: 10.2116/analsci.26.665] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
In this work, a reversible sensor to assess the total Se(IV) content in samples is described. Pre-activated glass slides were spin-coated with 100 microL of a 20-h aged sol-gel mixture of 1 mL of tetramethoxysilane, 305 microL of 50 mmol L(-1) HCl and 2.0 mg of thionine. The flow-cell consisted of one of those slides as a window, and was filled with beads of a polystyrene anionic exchange resin to retain Se(IV) in the form of selenite ions. A reflectance transduction scheme at a wavelength of 596 nm was adopted. The cell was coupled to a multicommutation flow system where a programmed volume of a sample solution and 373 microL of 0.4 mmol L(-1) iodide in a 1.6 mol L(-1) HCl solution were sequentially inserted into the cell. The iodine produced from the reaction of retained Se(IV) with iodide bleached the blue color of thionine. Considering a sample volume of 2.30 mL, with which the preconcentration step was minimized, a linear dynamic working range between 1.5 to 20 microg mL(-1) and a detection limit of 0.29 microg mL(-1) were obtained. The sensor enabled us to perform approximately 200 assays, and provided results similar to those of electrothermal atomic absorption spectrometry.
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Affiliation(s)
- Joana A E Carvalhido
- REQUIMTE, Dep. Química-Física Fac. Farmácia U. P., R. Aníbal Cunha 164, 4099-030 Porto, Portugal
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Campillo N, Peñalver R, López-García I, Hernández-Córdoba M. Headspace solid-phase microextraction for the determination of volatile organic sulphur and selenium compounds in beers, wines and spirits using gas chromatography and atomic emission detection. J Chromatogr A 2009; 1216:6735-40. [PMID: 19700163 DOI: 10.1016/j.chroma.2009.08.019] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2009] [Revised: 07/25/2009] [Accepted: 08/10/2009] [Indexed: 11/24/2022]
Abstract
A rapid and solvent-free method for the determination of eight volatile organic sulphur and two selenium compounds in different beverage samples using headspace solid-phase microextraction and gas chromatography with atomic emission detection has been developed. The bonded carboxen/polydimethylsiloxane fiber was the most suitable for preconcentrating the analytes from the headspace of the sample solution. Volumes of 20 mL of undiluted beer were used while, in the case of wines and spirits, sample:water ratios of 5:15 and 2:18, respectively, were used, in order to obtain the maximum sensitivity. Quantitation was carried out by using synthetic matrices of beer and wine, and a spiked sample for spirits, and using ethyl methyl sulphide and isopropyl disulphide as internal standards. Detection limits ranged from 8 ng L(-1) to 40 ng mL(-1), depending on the compound and the beverage sample analyzed, with a fiber time exposure of 20 min at ambient temperature. The optimized method was successfully applied to different samples, some of the studied compounds being detected at concentration levels in the 0.04-152 ng mL(-1) range.
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Affiliation(s)
- Natalia Campillo
- Department of Analytical Chemistry, Faculty of Chemistry, University of Murcia, E-30071 Murcia, Spain
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Gonzalvez A, Cervera M, Armenta S, de la Guardia M. A review of non-chromatographic methods for speciation analysis. Anal Chim Acta 2009; 636:129-57. [DOI: 10.1016/j.aca.2009.01.065] [Citation(s) in RCA: 99] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2008] [Revised: 01/28/2009] [Accepted: 01/28/2009] [Indexed: 11/17/2022]
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18
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Ferri T, De Luca C, Ticconi L. SELENIUM SPECIATION IN ENVIRONMENTAL MATRICES: A PRELIMINARY STUDY ON PLANTS. ANAL LETT 2006. [DOI: 10.1081/al-100103607] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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19
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Bertolino FA, Torriero AAJ, Salinas E, Olsina R, Martinez LD, Raba J. Speciation analysis of selenium in natural water using square-wave voltammetry after preconcentration on activated carbon. Anal Chim Acta 2006; 572:32-8. [PMID: 17723458 DOI: 10.1016/j.aca.2006.05.021] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2006] [Revised: 04/28/2006] [Accepted: 05/08/2006] [Indexed: 11/16/2022]
Abstract
A simple, accurate, sensitive and selective method was described for rapid determination of ultra-trace quantities of selenium. Selenium(IV) was collected on activated carbon (AC) after reduction to elemental Se by l-ascorbic acid. The collected selenium was then dissolved by oxidation reaction with bromate in acidic media and was indirectly determined through the bromide formation using square-wave voltammetry (OSWV). The total amount of Se(IV) and Se(VI) was collected on AC after its reduction by hydrazine. Selenium in the range 0.01-20 microg L(-1) could be determined by this method. The method was used to the determination of Se(IV) and Se(VI) in natural water with satisfactory results.
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Affiliation(s)
- Franco A Bertolino
- Department of Chemistry, National University of San Luis, Chacabuco y Pedernera, 5700 San Luis, Argentina
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20
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Campillo N, Aguinaga N, Viñas P, López-García I, Hernández-Córdoba M. Gas chromatography with atomic emission detection for dimethylselenide and dimethyldiselenide determination in waters and plant materials using a purge-and-trap preconcentration system. J Chromatogr A 2005; 1095:138-44. [PMID: 16275294 DOI: 10.1016/j.chroma.2005.08.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2005] [Revised: 07/25/2005] [Accepted: 08/01/2005] [Indexed: 10/25/2022]
Abstract
Dimethylselenide (DMSe) and dimethyldiselenide (DMDSe) were determined in plant and water samples by capillary gas chromatography using microwave induced-plasma atomic emission spectrometry for detection. The analytes were leached from the solid samples into methanol by using an ultrasonic probe, and a portion of the extract was preconcentrated by means of a purge-and-trap system before being chromatographed. The analytes were directly purged from the water samples in the presence of 6% (v/v) methanol. Element-specific detection and quantification was carried out by monitoring the selenium (196 nm) emission line. Calibration curves were obtained by plotting peak area versus concentration and the correlation coefficients for linear calibration were 0.9999 for both analytes. Detection limits of 0.8 and 1.1 ng l(-1) were obtained for DMSe and DMDSe, respectively, for water samples. For plant materials, the detection limits calculated for 0.5 g samples were 0.3 and 0.4 ng g(-1) for DMSe and DMDSe, respectively. Concentration levels of DMSe ranging from 1.2 to 4.2 ng g(-1) were found in some of the plant materials analyzed. No DMDSe was found in any of the samples. The accuracy of the method was checked by analyzing different spiked water and plant samples.
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Affiliation(s)
- Natalia Campillo
- Department of Analytical Chemistry, Faculty of Chemistry, University of Murcia, Spain
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Viñas P, López-García I, Merino-Meroño B, Campillo N, Hernández-Córdoba M. Determination of selenium species in infant formulas and dietetic supplements using liquid chromatography–hydride generation atomic fluorescence spectrometry. Anal Chim Acta 2005. [DOI: 10.1016/j.aca.2004.11.068] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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22
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Selenium fractionation and speciation in rocks, soils, waters and plants in polluted surface mine environment. ACTA ACUST UNITED AC 2004. [DOI: 10.1007/s00254-004-1157-2] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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23
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Ferri T, Coccioli F, De Luca C, Callegari C, Morabito R. Distribution and speciation of selenium in Lecythis ollaria plant. Microchem J 2004. [DOI: 10.1016/j.microc.2004.06.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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24
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Hunter WJ, Kuykendall LD. Determination of dimethylselenide and dimethyldiselenide by gas chromatography–photoionization detection. J Chromatogr A 2004; 1038:295-7. [PMID: 15233545 DOI: 10.1016/j.chroma.2004.03.005] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
A simple method for the determination of volatile selenium compounds employing a gas chromatograph equipped with a photoionization detector is described. The method involves the direct injection of dimethylselenide (DMS) or dimethyldiselenide (DMDS) into the gas chromatograph; no derivatization of the sample was required. The photoionization detector was capable of detecting 60 pg (0.55 pmol) of DMS and 150pg (0.80pmol) DMDS. Sensitivity was 10-50 times greater with DMS and 4-20 times greater with DMDS when the photoionization detector was employed than when the flame ionization detector was employed.
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Affiliation(s)
- William J Hunter
- US Department of Agriculture, Agricultural Research Service, Suite 100, 2150D Centre Avenue, Fort Collins, CO 80526-8119, USA.
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Haberhauer-Troyer C, Alvarez-Llamas G, Zitting E, Rodríguez-González P, Rosenberg E, Sanz-Medel A. Comparison of different chloroformates for the derivatisation of seleno amino acids for gas chromatographic analysis. J Chromatogr A 2003; 1015:1-10. [PMID: 14570314 DOI: 10.1016/s0021-9673(03)01259-7] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Three chloroformate reagents, ethyl chloroformate (ECF), methyl chloroformate (MCF) and menthyl chloroformate (MenCF), have been used for the derivatisation of seleno amino acids and their performance was compared. Chromatographic parameters and the inertness of the different instrumental configurations used (gas chromatography-atomic emission detection (GC-AED), and GC-MS) were shown to have a significant influence on the detection of various seleno amino acids (selenomethione, selenoethione and selenocysteine) and some sulphur-containing amino acids (methionine, cysteine, cystine and methylcysteine) which were included in the experiments for comparison. Methyl chloroformate was the preferred derivatisation reagent, since it generally performed best in terms of derivatisation yield and reproducibility and also showed less significant conditioning effects than ethyl chloroformate. Methyl and ethyl chloroformate derivatives of selenomethionine, selenoethionine, cysteine and methionine were detectable, while the detection of the menthyl chloroformate derivatives of selenocystine and cystine was not reproducible. Overall efficiencies for the determination of selenomethionine and selenoethionine from aqueous extracts ranged from 40 to 100% for methyl chloroformate, over 30-75% for ethyl chloroformate to 15-70% for menthyl chloroformate for different series measured over a period of months. The relative standard deviation of the method for the methyl and menthyl chloroformate derivatisation ranged from 7 to 13% without internal standard and was improved to 2% for the determination of selenomethionine using selenoethionine as internal standard. This indicates that, despite the limited reproducibility of the method, its repeatability is good enough to allow accurate determination of seleno amino acids, which was also demonstrated by the analysis of selenium supplementation tablets for human diet that contained selenomethionine.
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Affiliation(s)
- C Haberhauer-Troyer
- Analytical Chemistry Division, Institute of Chemical Technology and Analytics, Vienna University of Technology, Getreidemarkt 9/164 AC, 1060 Vienna, Austria.
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26
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Sample preparation for speciation of selenium. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/s0166-526x(03)41032-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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27
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Ion-chromatography of inorganic selenium species with a preliminary preconcentration step. Chromatographia 2003. [DOI: 10.1007/bf02492085] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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28
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Stoica AI, Babaua GR, Iorgulescu EE, Marinescu D, Baiulescu GE. Differential pulse cathodic stripping voltammetric determination of selenium in pharmaceutical products. J Pharm Biomed Anal 2002; 30:1425-9. [PMID: 12408935 DOI: 10.1016/s0731-7085(02)00454-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The aim of this paper is to determine selenium from pharmaceutical products by differential pulse cathodic stripping voltammetry. Firstly, were established the optimum parameters for voltammetric determination of selenium (electrolyte, deposition time, pulse duration, pulse amplitude, etc.) and secondly, the content of selenium was determined in five pharmaceutical products. The drug samples were treated with a mixture of 6 ml HNO(3) and 1 ml H(2)O(2) in the microwave oven. Due to the matrix effects the method of addition is preferred. The peak potential is -0.545 V vs. Ag/AgCl, and the calibration curve is linear up to 0.125 ng/ml, but selenium was determined from pharmaceutical products used the calibration curve in the range 8-64 ng/ml, due to the concentration of selenium in these tablets.
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Affiliation(s)
- Anca Iulia Stoica
- Department of Analytical Chemistry, Faculty of Chemistry, University of Bucharest, 4-12, Regina Elisabeta Boulevard, 703461 -3, Bucharest, Romania.
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29
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Vonderheide AP, Wrobel K, Kannamkumarath SS, B'Hymer C, Montes-Bayón M, Ponce De León C, Caruso JA. Characterization of selenium species in Brazil nuts by HPLC-ICP-MS and ES-MS. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2002; 50:5722-5728. [PMID: 12236705 DOI: 10.1021/jf0256541] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Brazil nuts have been classified as the foodstuffs that contain the highest level of unadulterated selenium, an essential trace element that appears to prevent cancer. To date, characterization of the selenium species in brazil nuts has not yet been investigated. In this work, various sample preparation approaches, including microwave extractions and enzymatic treatments, are examined with the goal of species preservation and subsequent selenium speciation; of these approaches, an enzymatic treatment with Proteinase K proved most effective. High-performance liquid chromatography (HPLC) separation strategies and inductively coupled plasma mass spectrometry (ICP-MS) detection schemes will also be presented. Extracts are evaluated against available standards for the commercially obtainable seleno-amino acids, selenomethionine (SeMet), selenoethionine (SeEt), and selenocystine (SeCys); selenomethionine was demonstrated to be the most abundant of these seleno-amino acids. Further characterization of unidentified selenium-containing peaks is attempted by the employment of several procedures, including electrospray-mass spectrometry (ES-MS). A peptide structure was identified; however, this was considered a tentative proposal due to the large background produced by the extremely complicated brazil nut matrix.
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30
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Bueno M, Potin-Gautier M. Solid-phase extraction for the simultaneous preconcentration of organic (selenocystine) and inorganic [Se(IV), Se(VI)] selenium in natural waters. J Chromatogr A 2002; 963:185-93. [PMID: 12187969 DOI: 10.1016/s0021-9673(02)00125-5] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
This paper describes the combined use of a new preconcentration method using the Amberlite IRA-743 resin and high-performance liquid chromatography coupled to inductively coupled plasma mass spectrometry to determine simultaneously inorganic and organic selenium species in aquatic systems. The developed enrichment procedure, whose accuracy has been checked by recovery tests, is suitable for selenium speciation at environmental levels of 10 ng (Se) l(-1). The method has been applied to mineral and freshwater samples.
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Affiliation(s)
- Maïté Bueno
- Laboratoire de Chimie Analytique, Bio-Inorganique et Environnement, Université de Pau et des Pays de l'Adour, UMR CNRS 5034, Helioparc, Pau, France.
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31
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Su HW, Ha J, Zhang DQ, Yang LL, Sun JM. Determination of trace selenium in urine by derivative hydride generation atomic absorption spectrometry. ANAL SCI 2002; 18:603-5. [PMID: 12036134 DOI: 10.2116/analsci.18.603] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Han Wen Su
- College of Chemistry and Environmental Science, Hebei University, Boading, PR China.
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32
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Determination of selenomethionine by high performance liquid chromatography-direct hydride generation-atomic absorption spectrometry. Microchem J 2001. [DOI: 10.1016/s0026-265x(01)00081-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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33
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Determination of selenoethionine by flow injection-hydride generation-atomic absorption spectrometry/high-performance liquid chromatography-hydride generation-high power nitrogen microwave-induced plasma mass spectrometry. Anal Chim Acta 2001. [DOI: 10.1016/s0003-2670(01)00970-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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34
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Chatterjee A, Shibata Y. Determination of trimethylselenonium ion by flow injection hydride generation atomic absorption spectrometry. Anal Chim Acta 1999. [DOI: 10.1016/s0003-2670(99)00591-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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35
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Affiliation(s)
- R E Clement
- Laboratory Services Branch, Ontario Ministry of Environment, Canada
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