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	Provedor de dados Organic Eprints (4) Autor Hansen, Thomas Hesselhøj (4) Husted, Søren (4) Laursen, Kristian Holst (4) Persson, Daniel Pergament (4) Schjørring, Jan Kofod (3) Pedas, Pai (1) Schjørring, J.K. (1) Mais... Palavra-chave Food systems (2) Standards and certification Food systems (2) Values (2) Tipo do documento Journal paper (4) Ano 2009 (4) País Germany (4) Idioma Inglês (4)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 4 Primeira ... 1 ... Última Multi-elemental fingerprinting of plant tissue by semi-quantitative ICP-MS and chemometrics Organic Eprints Laursen, Kristian Holst; Hansen, Thomas Hesselhøj; Persson, Daniel Pergament; Schjørring, Jan Kofod; Husted, Søren. The multi-elemental capacity of Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) is rarely fully utilized in traditional full-quantitative analysis. The main obstacles are limited availability of multi-elemental standards and the need for time-consuming external calibrations. In this study, a novel semi-quantitative quadrupole ICP-MS based method for multi-elemental fingerprinting of plant tissue was developed as a high-throughput alternative to full-quantitative analysis. The main analytical objectives were low data acquisition time (<60 seconds), detailed coverage of the atomic mass range from 7Li to 238U and discrimination power similar to full-quantitative analysis based on chemometric data analysis. The method was tested on grains of different... Tipo: Journal paper Palavras-chave: Values; Standards and certification Food systems. Ano: 2009 URL: http://orgprints.org/19086/1/Laursen_2009.pdf Multi-elemental fingerprinting of plant tissue by semi-quantitative ICP-MS and chemometrics Organic Eprints Laursen, Kristian Holst; Hansen, Thomas Hesselhøj; Persson, Daniel Pergament; Schjørring, Jan Kofod; Husted, Søren. The multi-elemental capacity of Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) is rarely fully utilized in traditional full-quantitative analysis. The main obstacles are limited availability of multi-elemental standards and the need for time-consuming external calibrations. In this study, a novel semi-quantitative quadrupole ICP-MS based method for multi-elemental fingerprinting of plant tissue was developed as a high-throughput alternative to full-quantitative analysis. The main analytical objectives were low data acquisition time (<60 seconds), detailed coverage of the atomic mass range from 7Li to 238U and discrimination power similar to full-quantitative analysis based on chemometric data analysis. The method was tested on grains of different... Tipo: Journal paper Palavras-chave: Values; Standards and certification Food systems. Ano: 2009 URL: http://orgprints.org/19149/1/Laursen_2009.pdf Micro-scaled high-throughput digestion of plant tissue samples for multi-elemental analysis Organic Eprints Hansen, Thomas Hesselhøj; Laursen, Kristian Holst; Persson, Daniel Pergament; Pedas, Pai; Husted, Søren; Schjørring, Jan Kofod. Quantitative multi-elemental analysis by inductively coupled plasma (ICP) spectrometry depends on a complete digestion of solid samples. However, fast and thorough sample digestion is a challenging analytical task which constitutes a bottleneck in modern multi-elemental analysis. Additional obstacles may be that sample quantities are limited and elemental concentrations low. In such cases, digestion in small volumes with minimum dilution and contamination is required in order to obtain high accuracy data. Results We have developed a micro-scaled microwave digestion procedure and optimized it for accurate elemental profiling of plant materials (1-20 mg dry weight). A commercially available 64-position rotor with 5 ml disposable glass vials, originally... Tipo: Journal paper Palavras-chave: Food systems. Ano: 2009 URL: http://orgprints.org/19087/4/19087.pdf Simultaneous iron, zinc, sulphur and phosphorus speciation analysis of barley grain tissues using SEC-ICP-MS and IP-ICP-MS Organic Eprints Persson, Daniel Pergament; Hansen, Thomas Hesselhøj; Laursen, Kristian Holst; Schjørring, J.K.; Husted, Søren. The increasing prevalence of iron (Fe) and zinc (Zn) deficiencies in human populations worldwide has stressed the need for more information about the distribution and chemical speciation of these elements in cereal products. In order to investigate these aspects, barley grains were fractionated into awns, embryo, bran and endosperm and analysed for Fe and Zn. Simultaneously, phosphorus (P) and sulfur (S) were determined since these elements are major constituents of phytic acid and proteins, respectively, compounds which are potentially involved in Fe and Zn binding. A novel analytical method was developed in which oxygen was added to the octopole reaction cell of the ICP-MS. This approach greatly improved the sensitivity of sulfur, measured as 48SO+.... Tipo: Journal paper Palavras-chave: Food systems. Ano: 2009 URL: http://orgprints.org/19157/7/19157.pdf Registros recuperados: 4 Primeira ... 1 ... Última

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