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Potential of X-Ray Spectrometry and Chemometrics to Discriminate Organic from Conventional Grown Agricultural Products

Bortoleto, Gisele G.; De Nadai Fernandes, Elisabete A.; Tagliaferro, Fábio S.; Ferrari, Angela A. and Bueno, Maria Izabel M. S. (2008) Potential of X-Ray Spectrometry and Chemometrics to Discriminate Organic from Conventional Grown Agricultural Products. Poster at: Cultivating the Future Based on Science: 2nd Conference of the International Society of Organic Agriculture Research ISOFAR, Modena, Italy, June 18-20, 2008.

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Summary

This work describes an innovative analytical method based on X-ray spectrometry combined with chemometrics which presents high potential to discriminate conventional from organic grown tomatoes and coffee beans. This novelty is based on the irradiation of samples in a bench-top EDXRF equipment provided with a Rh tube and further treatment of the spectral data using Principal Component Analysis (PCA). Multivariate analysis results showed a tendency in separating the samples according to the production mode (organic or conventional). Regarding the spectra obtained, the K alpha peak of potassium showed to be the most responsible for discriminating different categories of samples. The chlorine K-alpha peak presented high capability in discriminating tomato and coffee samples from different origins. The method can be useful for food quality control to rapidly classify samples since the measurements can be done “in situ” with portable instruments. Nevertheless, it will be necessary to build robust classification models with a larger number of samples.


EPrint Type:Conference paper, poster, etc.
Type of presentation:Poster
Keywords:organic coffee, organic tomato, principal component analysis, X-ray spectrometry
Subjects: Food systems > Food security, food quality and human health
Food systems > Markets and trade
Research affiliation: International Conferences > 2008: IFOAM OWC: Research Track / ISOFAR > 9.1 Research methodology
Brazil > Other organizations
Deposited By: Tagliaferro, Dr Fábio S.
ID Code:12348
Deposited On:22 Sep 2008
Last Modified:12 Apr 2010 07:36
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted
Additional Publishing Information:This paper is published in the conference proceedings:
Neuhoff, Daniel; Halberg, Niels; Alfldi, Thomas; Lockeretz, William; Thommen, Andreas; Rasmussen, Ilse A.; Hermansen, John; Vaarst, Mette; Lck, Lorna; Carporali, Fabio; Jensen, Henning Hgh; Migliorini, Paola and Willer, Helga, Eds. (2008) .Cultivating the Future Based on Science. Proceedings of the Second Scientific Conference of the International Society of Organic Agriculture Research (ISOFAR), held at the 16th IFOAM Organic World Congress in Cooperation with the International Federation of Organic Agriculture Movements (IFOAM) and the Consorzio ModenaBio, 18 . 20 June 2008 in Modena, Italy.. International Society of Organic Agriculture Research (ISOFAR), c/o IOL, DE-Bonn, Research Institute of Organic Agriculture FiBL, CH-Frick. http://orgprints.org/13672 and http://orgprints.org/13674

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