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Ma Q, Zhang Q, Li X, Gao Y, Wei C, Li H, Jiao H. The compound-independent calibration of five selenium species in rice using ion-pairing reversed phase chromatography coupled to inductively coupled plasma tandem mass spectrometry. J Chromatogr A 2022; 1674:463134. [DOI: 10.1016/j.chroma.2022.463134] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Revised: 04/30/2022] [Accepted: 05/07/2022] [Indexed: 11/26/2022]
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2
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Sentkowska A, Pyrzynska K. Stability of selenium compounds in aqueous extracts of dietary supplements during storage. J Pharm Biomed Anal 2022; 214:114714. [DOI: 10.1016/j.jpba.2022.114714] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Revised: 03/04/2022] [Accepted: 03/04/2022] [Indexed: 11/27/2022]
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Karaś K, Zioła-Frankowska A, Frankowski M. New Method for Simultaneous Arsenic and Selenium Speciation Analysis in Seafood and Onion Samples. Molecules 2021; 26:6223. [PMID: 34684804 PMCID: PMC8539270 DOI: 10.3390/molecules26206223] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Revised: 10/11/2021] [Accepted: 10/12/2021] [Indexed: 11/22/2022] Open
Abstract
This paper presents a new method for the simultaneous speciation analysis of arsenic (As(III)-arsenite, As(V)-arsenate, DMA-dimethylarsinic acid, MMA-methylarsonic acid, and AsB-arsenobetaine) and selenium (Se(IV)-selenite, Se(VI)-selenate, Se-Methionine, and Se-Cystine), which was applied to a variety of seafood and onion samples. The determination of the forms of arsenic and selenium was undertaken using the High-Performance Liquid Chromatography Inductively Coupled Plasma Mass Spectrometry (HPLC-ICP-MS) analytical technique. The separation of both organic and inorganic forms of arsenic and selenium was performed using two analytical columns: an anion exchange column, Dionex IonPac AS22, containing an alkanol quaternary ammonium ion, and a double bed cation-anion exchange guard column, Dionex Ion Pac CG5A, containing, as a first layer, fully sulfonated latex for cation exchange and a fully aminated layer for anion exchange as the second layer. The ammonium nitrate, at pH = 9.0, was used as a mobile phase. The method presented here allowed us to separate the As and Se species within 10 min with a suitable resolution. The applicability was presented with different sample matrix types: seafood and onion.
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Affiliation(s)
- Katarzyna Karaś
- Department of Analytical and Environmental Chemistry, Faculty of Chemistry, Adam Mickiewicz University in Poznan, 61-614 Poznan, Poland;
| | - Anetta Zioła-Frankowska
- Department of Analytical Chemistry, Faculty of Chemistry, Adam Mickiewicz University in Poznan, 61-614 Poznan, Poland;
| | - Marcin Frankowski
- Department of Analytical and Environmental Chemistry, Faculty of Chemistry, Adam Mickiewicz University in Poznan, 61-614 Poznan, Poland;
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Prange A, Sari M, von Ameln S, Hajdu C, Hambitzer R, Ellinger S, Hormes J. Characterization of selenium speciation in selenium-enriched button mushrooms (Agaricus bisporus) and selenized yeasts (dietary supplement) using X-ray absorption near-edge structure (XANES) spectroscopy. J Trace Elem Med Biol 2019; 51:164-168. [PMID: 30466927 DOI: 10.1016/j.jtemb.2018.10.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Revised: 10/02/2018] [Accepted: 10/18/2018] [Indexed: 12/22/2022]
Abstract
Selenium is an essential trace element for which dietary intake is not sufficient in many parts of the world such as in Europe. Yeast and mushrooms may accumulate considerable amounts of selenium, but the chemical form in mushrooms has not been elucidated yet. Thus, we determined the selenium speciation of selenium-enriched button mushrooms in comparison to that of selenized yeast via Se K-edge XANES spectroscopy. Quantitative analysis of the XANES spectra revealed that the selenium in selenized yeast is mainly present as seleno-methionine but that in selenium-enriched button mushrooms, it is present predominantly as Se-methyl-l-selenocysteine. As this form is highly bioavailable and directly enters the selenium metabolic pool, selenium-enriched mushrooms may be a good food choice to improve selenium intake.
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Affiliation(s)
- Alexander Prange
- Competence Center for Applied Mycology and Environmental Studies, Department of Food Sciences and Nutrition, Niederrhein University of Applied Sciences, Rheydter Str. 277, D-41065 Mönchengladbach, Germany; The J. Bennett Johnston, Sr., Center for Advanced Microstructures & Devices (CAMD), Louisiana State University, 6980 Jefferson Highway, Baton Rouge, LA 70803, USA; Institute for Virology and Microbiology, University of Witten/Herdecke, Stockumer Str. 10, D-58453 Witten, Germany.
| | - Miriam Sari
- Competence Center for Applied Mycology and Environmental Studies, Department of Food Sciences and Nutrition, Niederrhein University of Applied Sciences, Rheydter Str. 277, D-41065 Mönchengladbach, Germany
| | - Susanne von Ameln
- Competence Center for Applied Mycology and Environmental Studies, Department of Food Sciences and Nutrition, Niederrhein University of Applied Sciences, Rheydter Str. 277, D-41065 Mönchengladbach, Germany; Institute for Virology and Microbiology, University of Witten/Herdecke, Stockumer Str. 10, D-58453 Witten, Germany
| | - Csaba Hajdu
- BioFungi kft, 2338 Áporka, Szabadság telep 030/10, Hungary
| | - Reinhard Hambitzer
- Competence Center for Applied Mycology and Environmental Studies, Department of Food Sciences and Nutrition, Niederrhein University of Applied Sciences, Rheydter Str. 277, D-41065 Mönchengladbach, Germany
| | - Sabine Ellinger
- Competence Center for Applied Mycology and Environmental Studies, Department of Food Sciences and Nutrition, Niederrhein University of Applied Sciences, Rheydter Str. 277, D-41065 Mönchengladbach, Germany
| | - Josef Hormes
- The J. Bennett Johnston, Sr., Center for Advanced Microstructures & Devices (CAMD), Louisiana State University, 6980 Jefferson Highway, Baton Rouge, LA 70803, USA; Institute of Physics, University of Bonn, Nussallee 12, D-53115 Bonn, Germany
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Bakırdere S, Volkan M, Ataman OY. Selenium speciation in chicken breast samples from inorganic and organic selenium fed chickens using high performance liquid chromatography-inductively coupled plasma-mass spectrometry. J Food Compost Anal 2018. [DOI: 10.1016/j.jfca.2018.05.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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6
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Surai PF, Kochish II, Fisinin VI, Velichko OA. Selenium in Poultry Nutrition: from Sodium Selenite to Organic Selenium Sources. J Poult Sci 2017; 55:79-93. [PMID: 32055160 PMCID: PMC6756489 DOI: 10.2141/jpsa.0170132] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2017] [Accepted: 11/07/2017] [Indexed: 12/24/2022] Open
Abstract
Selenium (Se) is an essential element in poultry nutrition and its bio-efficacy depends on its chemical form. A growing body of research proves that organic forms of Se, mainly selenomethionine (SeMet), in poultry diets have a range of important advantages over traditional sodium selenite. In fact, the organic Se concept considers SeMet as a storage form of Se in the chicken body. As chickens are not able to synthesize SeMet, its provision through diet is a key strategy to fight commercially relevant stresses. Indeed, in stress conditions, when increased selenoprotein expression requires additional Se, while its provision via feed usually decreases due to a reduction in feed consumption, Se reserves in the body (mainly in the muscles) could help maintain an effective antioxidant defense and prevent detrimental consequences of stresses. The poultry industry is looking for the most effective sources of organic Se for commercial use. In this review, advantages and disadvantages of main organic Se sources for poultry (Se-yeast, SeMet, and OH-SeMet) are analyzed, and future directions for the development of new Se sources are identified.
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Affiliation(s)
- Peter F. Surai
- Department of Microbiology and Biochemistry, Faculty of Veterinary Medicine, Trakia University, Stara Zagora 6000, Bulgaria
- Moscow State Academy of Veterinary Medicine and Biotechnology named after K.I. Skryabin, Moscow, 109472, Russia
- Department of Animal Nutrition, Faculty of Agricultural and Environmental Sciences, Szent Istvan University, Gödöllo H-2103, Hungary
| | - Ivan I. Kochish
- Moscow State Academy of Veterinary Medicine and Biotechnology named after K.I. Skryabin, Moscow, 109472, Russia
| | | | - Oksana A. Velichko
- Department of Ecology and Genetics, Tyumen State University, Tyumen, 625003, Russia
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Gao L, Luo D, Hu X, Wu J. Se in Se-enriched peanut, and losses during peanut protein preparation. Int J Food Sci Technol 2017. [DOI: 10.1111/ijfs.13347] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Lin Gao
- College of Food Science and Nutritional Engineering; China Agricultural University; Beijing 100083 China
- National Engineering Research Center for Fruits and Vegetables Processing; Ministry of Science and Technology; Beijing 100083 China
- Key Laboratory of Fruits and Vegetables Processing; Ministry of Agriculture; Beijing 100083 China
| | - Dongsheng Luo
- College of Food Science and Nutritional Engineering; China Agricultural University; Beijing 100083 China
- National Engineering Research Center for Fruits and Vegetables Processing; Ministry of Science and Technology; Beijing 100083 China
- Key Laboratory of Fruits and Vegetables Processing; Ministry of Agriculture; Beijing 100083 China
| | - Xiaosong Hu
- College of Food Science and Nutritional Engineering; China Agricultural University; Beijing 100083 China
- National Engineering Research Center for Fruits and Vegetables Processing; Ministry of Science and Technology; Beijing 100083 China
- Key Laboratory of Fruits and Vegetables Processing; Ministry of Agriculture; Beijing 100083 China
| | - Jihong Wu
- College of Food Science and Nutritional Engineering; China Agricultural University; Beijing 100083 China
- National Engineering Research Center for Fruits and Vegetables Processing; Ministry of Science and Technology; Beijing 100083 China
- Key Laboratory of Fruits and Vegetables Processing; Ministry of Agriculture; Beijing 100083 China
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Jagtap R, Maher W. Determination of selenium species in biota with an emphasis on animal tissues by HPLC–ICP-MS. Microchem J 2016. [DOI: 10.1016/j.microc.2015.07.014] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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10
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Surai PF, Fisinin VI. Selenium in pig nutrition and reproduction: boars and semen quality-a review. ASIAN-AUSTRALASIAN JOURNAL OF ANIMAL SCIENCES 2015; 28:730-46. [PMID: 25924964 PMCID: PMC4413004 DOI: 10.5713/ajas.14.0593] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/01/2014] [Revised: 10/14/2014] [Accepted: 11/23/2014] [Indexed: 01/01/2023]
Abstract
Selenium plays an important role in boar nutrition via participating in selenoprotein synthesis. It seems likely that selenoproteins are central for antioxidant system regulation in the body. Se-dependent enzyme glutathione peroxidase (GSH-Px) is the most studied selenoprotein in swine production. However, roles of other selenoproteins in boar semen production and maintenance of semen quality also need to be studied. Boar semen is characterised by a high proportion of easily oxidized long chain polyunsaturated fatty acids and requires an effective antioxidant defense. The requirement of swine for selenium varies depending on many environmental and other conditions and, in general, is considered to be 0.15 to 0.30 mg/kg feed. It seems likely that reproducing sows and boars are especially sensitive to Se deficiency, and meeting their requirements is an important challenge for pig nutritionists. In fact, in many countries there are legal limits as to how much Se may be included into the diet and this restricts flexibility in terms of addressing the Se needs of the developing and reproducing swine. The analysis of data of various boar trials with different Se sources indicates that in some cases when background Se levels were low, there were advantages of Se dietary supplementation. It is necessary to take into account that only an optimal Se status of animals is associated with the best antioxidant protection and could have positive effects on boar semen production and its quality. However, in many cases, background Se levels were not determined and therefore, it is difficult to judge if the basic diets were deficient in Se. It can also be suggested that, because of higher efficacy of assimilation from the diet, and possibilities of building Se reserves in the body, organic selenium in the form of selenomethionine (SeMet) provided by a range of products, including Se-Yeast and SeMet preparations is an important source of Se to better meet the needs of modern pig genotypes in commercial conditions of intensive pig production.
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Affiliation(s)
- Peter F Surai
- Department of Animal Nutrition, Faculty of Agricultural and Environmental Sciences, Szent Istvan University, Gödöllo H-2103, Hungary ; Department of Microbiology and Biochemistry, Faculty of Veterinary Medicine, Trakia University, Stara Zagora 6000, Bulgaria . ; Department of Veterinary Expertise and Microbiology, Faculty of Veterinary Medicine, Sumy National Agrarian University, Sumy, 40021, Ukraine . ; Odessa National Academy of Food Technologies, Odessa 65039, Ukraine
| | - Vladimir I Fisinin
- All-Russian Institute of Poultry Husbandry, Sergiev Posad, 141311, Russia
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11
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Zhong N, Zhong L, Hao L, Luan C, Li X. Speciation of Selenium in Enriched Garlic Sprouts by High-Performance Liquid Chromatography Coupled with Inductively Coupled Plasma-Mass Spectrometry. ANAL LETT 2014. [DOI: 10.1080/00032719.2014.930875] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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García-Salgado S, Quijano MÁ. Stability of toxic arsenic species and arsenosugars found in the dry alga Hijiki and its water extracts. Talanta 2014; 128:83-91. [PMID: 25059134 DOI: 10.1016/j.talanta.2014.04.038] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2014] [Revised: 04/10/2014] [Accepted: 04/15/2014] [Indexed: 10/25/2022]
Abstract
The achievement of reliable results in speciation analysis requires not only sensitive techniques but also sureness of species stability. Therefore, it is necessary to carry out stability studies because it is important to know with absolute certainty that there is not any species transformation during sample treatment and/or storage. Although several procedures have been recommended for the preservation of species integrity, there is no general agreement, as arsenic species stability depends on the sample matrix, the concentration level and the sample treatment procedure, so it is necessary to assess the arsenic species stability for each case. Thus, the present paper reports the stability tests of arsenic species carried out on the commercially available edible alga Hijiki (Hizikia fusiformis), from Japan, in both the dry sample and its water extracts, which were stored in amber glass and polystyrene containers at -18 and +4°C in the dark. Extractions were carried out with deionized water by microwave-assisted extraction, at a temperature of 90°C and three extraction steps of 5 min each, whereas arsenic speciation analysis was performed by anion exchange high performance liquid chromatography-photo-oxidation-hydride generation-atomic fluorescence spectrometry. The results obtained for the dry alga showed that the arsenic species present in it (arsenate (As(V)), dimethylarsinic acid (DMA) and the arsenosugars glycerol (Gly-sug), phosphate (PO4-sug), sulfonate (SO3-sug) and sulfate (SO4-sug)) were stable for at least 12 months when the sample was stored in polystyrene containers at +20°C in the dark. Regarding water extracts, the best storage conditions consisted of the use of polystyrene containers and a temperature of +4°C, for a maximum storage time of seven days. Therefore, the immediate analysis of Hijiki water extracts would not be necessary, and they could be stored for one week before analysis, ensuring arsenic species stability. This information about species integrity in extracts is especially useful when the sample treatment for arsenic species extraction is time-consuming.
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Affiliation(s)
- Sara García-Salgado
- Departamento de Ingeniería Civil: Tecnología Hidráulica y Energética, Escuela Técnica Superior de Ingeniería Civil, Universidad Politécnica de Madrid, C/Alfonso XII, 3, 28014 Madrid, Spain.
| | - M Ángeles Quijano
- Departamento de Ingeniería Civil: Tecnología Hidráulica y Energética, Escuela Técnica Superior de Ingeniería Civil, Universidad Politécnica de Madrid, C/Alfonso XII, 3, 28014 Madrid, Spain
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14
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Zhang Q, Yang G. Selenium speciation in bay scallops by high performance liquid chromatography separation and inductively coupled plasma mass spectrometry detection after complete enzymatic extraction. J Chromatogr A 2014; 1325:83-91. [DOI: 10.1016/j.chroma.2013.11.050] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2013] [Revised: 11/07/2013] [Accepted: 11/26/2013] [Indexed: 10/26/2022]
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15
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Development of chip-based photocatalyst-assisted reduction device to couple high performance liquid chromatography and inductively coupled plasma-mass spectrometry for determination of inorganic selenium species. J Chromatogr A 2013; 1304:101-8. [DOI: 10.1016/j.chroma.2013.06.067] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2013] [Revised: 06/11/2013] [Accepted: 06/26/2013] [Indexed: 02/07/2023]
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Moreda-Piñeiro J, Alonso-Rodríguez E, Moreda-Piñeiro A, Moscoso-Pérez C, Muniategui-Lorenzo S, López-Mahía P, Prada-Rodríguez D, Bermejo-Barrera P. Simultaneous pressurized enzymatic hydrolysis extraction and clean up for arsenic speciation in seafood samples before high performance liquid chromatography–inductively coupled plasma-mass spectrometry determination. Anal Chim Acta 2010; 679:63-73. [DOI: 10.1016/j.aca.2010.09.010] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2010] [Revised: 09/07/2010] [Accepted: 09/08/2010] [Indexed: 10/19/2022]
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Cuderman P, Stibilj V. Stability of Se species in plant extracts rich in phenolic substances. Anal Bioanal Chem 2009; 396:1433-9. [DOI: 10.1007/s00216-009-3324-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2009] [Revised: 11/11/2009] [Accepted: 11/16/2009] [Indexed: 10/20/2022]
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Alzate A, Fernández-Fernández A, Pérez-Conde MC, Gutiérrez AM, Cámara C. Comparison of biotransformation of inorganic selenium by Lactobacillus and Saccharomyces in lactic fermentation process of yogurt and kefir. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2008; 56:8728-8736. [PMID: 18729458 DOI: 10.1021/jf8013519] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The aim of the present study was to characterize, quantify, and compare the different selenium species that are produced when lactic fermentation with two different types of microorganisms, bacteria (Lactobacillus) and yeast (Saccharomyces), take place to produce yogurt and kefir, respectively, and to study the transformation process of these species as a function of time. These two dairy products were chosen for the study because they are highly consumed in different cultures. Moreover, the microorganisms present in the fermentation processes are different. While the bacteria Lactobacillus is the one responsible for yogurt fermentation, a partnership between bacteria and the yeast Saccharomyces causes kefir fermentation. A comparative study has been carried out by fermenting Se(IV) enriched milk in the presence of both types of microorganisms, where the concentration range studied was from 0.5 to 20 microg g (-1). Enzymatic extraction enabled selenium speciation profiles, obtained by anionic exchange and ion-pairing reversed phase high performance liquid chromatography (IP-RP-HPLC) with inductively coupled plasma mass spectrometry (ICP-MS) detection. Scanning electron microscopy (SEM) applied to the enriched samples showed segregated Se (0), at added concentrations higher than 5 microg g (-1). The main Se species formed depended on the type of microorganism involved in the fermentation process, SeCys 2 and MeSeCys being the main species generated in yogurt and SeMet in kefir. The results obtained are different for both kinds of samples. Lactic fermentation for yogurt produced an increment in selenocystine (SeCys 2) and Se-methylselenocysteine (MeSeCys), while fermentation to produce kefir also incremented the selenomethionine (SeMet) concentration. The Se species are stable for at least 10 and 15 days for kefir and yogurt, respectively. After this period, selenocystine concentration decreased, and the concentration of Se-methylselenocysteine was found to significantly increase.
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Affiliation(s)
- A Alzate
- Dpto. de Química Analítica, Facultad de Ciencias Químicas, UCM, 28040 Madrid, Spain
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Wolf C, Wenda N, Richter A, Kyriakopoulos A. Alteration of biological samples in speciation analysis of metalloproteins. Anal Bioanal Chem 2007; 389:799-810. [PMID: 17673986 DOI: 10.1007/s00216-007-1495-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2007] [Revised: 06/27/2007] [Accepted: 07/05/2007] [Indexed: 11/28/2022]
Abstract
For investigations of metalloproteins by speciation analysis, the integrity of the protein-metal complexes before and during separation is crucial. Knowledge about potential alterations of the samples is thus essential to avoid misinterpretations of the analytical results. Chromatographic element profiles of different cytosolic samples from animal tissues were measured repeatedly to estimate the sample stability. The dependence of the signals on the dwell time of the sample in an autosampling device at 4 degrees C for a period of 10 h was observed. Alterations in the element content of different metal-containing fractions were quantified by means of recovery values. Some metalloprotein fractions (e.g. approximately 27-kDa arsenic, approximately 27-kDa iron and different zinc fractions) were stable or only minor alterations were observed and for their investigation an autosampling device is therefore suitable. However, most of the other metalloprotein fractions, especially nickel-containing proteins, showed major alterations: these samples should therefore be analysed immediately after preparation or directly after thawing.
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Affiliation(s)
- Christian Wolf
- Department SF6, Hahn-Meitner-Institute Berlin, Glienicker Str. 100, 14109, Berlin, Germany.
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Theodorolea S, Thomaidis NS, Piperaki E. Determination of selenium in human milk by electrothermal atomic absorption spectrometry and chemical modification. Anal Chim Acta 2005. [DOI: 10.1016/j.aca.2005.01.030] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Smrkolj P, Stibilj V, Kreft I, Kapolna E. Selenium Species Determination in Selenium-Enriched Pumpkin (Cucurbita pepo L.) Seeds by HPLC-UV-HG-AFS. ANAL SCI 2005; 21:1501-4. [PMID: 16379394 DOI: 10.2116/analsci.21.1501] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Pumpkins were treated by spraying the leaves in the flowering period with a water solution containing 1.5 mg Se per liter in the form of Na2SeO4. The average total selenium content of seeds was found to be 0.19 microg g(-1) in nontreated pumpkins and 1.1 microg g(-1) in exposed ones. For speciation analysis, enzymatic hydrolysis with different amounts of Protease XIV was carried out. Under optimal conditions of enzymatic hydrolysis, 90% of the total selenium was found in soluble forms. Separation of species was performed using HPLC on anion and cation exchange columns and for detection UVHG-AFS was applied. In enzymatic hydrolysis extracts, the main fraction of selenium was bound as selenomethionine (SeMet), representing on average of 81 +/- 8% of the total Se content in the sample.
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Affiliation(s)
- Polona Smrkolj
- Jozef Stefan Institute, Jamova 39, 1111 Ljubljana, Slovenia
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