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Multi-elemental fingerprinting of plant tissue by semi-quantitative ICP-MS and chemometrics

Laursen, Kristian Holst; Hansen, Thomas Hesselhøj; Persson, Daniel Pergament; Schjørring, Jan Kofod and Husted, Søren (2009) Multi-elemental fingerprinting of plant tissue by semi-quantitative ICP-MS and chemometrics. Journal of Analytical Atomic Spectrometry, 24, pp. 1198-1207.

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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 rice (Oryza sativa) genotypes. The semi-quantitative rice fingerprints consisted of 30 elements based on the limit of detections as inclusion criteria. Fourteen of these were determined with an accuracy >70%. In conjunction with chemometrics, the discrimination power of the semi-quantitative results was better than that of full-quantitative analysis. The superior discrimination power of semi-quantitative analysis was maintained, even when it was combined with a high-throughput digestion procedure, which represented a 5 fold reduction in analytical labour consumption. Thus, the large amount of elemental information obtained using semi-quantitative ICP-MS fully outweighed the lack of accuracy compared to full-quantitative analysis. For the first time it is demonstrated that semi-quantitative ICP-MS in combination with chemometrics provides a fast and powerful alternative to traditional full-quantitative ICP-MS. The method developed here constitutes a promising novel analytical tool, which has the potential to mature into a routine procedure for testing e.g. the authenticity and adulteration of food products.

EPrint Type:Journal paper
Subjects: Values, standards and certification
Food systems
Research affiliation: Denmark > DARCOF III (2005-2010) > ORGTRACE - Organic food and health
Denmark > KU - University of Copenhagen > KU-LIFE - Faculty of Life Sciences
DOI:DOI: 10.1039/B901960J
Deposited By: Holst Laursen, Assis Prof Kristian
ID Code:19149
Deposited On:08 Jul 2011 10:56
Last Modified:08 Jul 2011 10:56
Document Language:English
Refereed:Peer-reviewed and accepted

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