X-Ray Fluorescence Analysis of Ground Coffee

Maria Cristina  Hernandez; Dario  Romero; Humberto  Torres; Javier  Miranda; A.  Enrique-Hernandez-Lopez

doi:10.15415/jnp.2017.51003

Authors

Maria Cristina Hernandez Facultad de Ciencias, Universidad Nacional Autónoma de México, Circuito Exterior, 04510, Coyoacán, Cd. Mx., MEXICO
Dario Romero Facultad de Ciencias, Universidad Nacional Autónoma de México, Circuito Exterior, 04510, Coyoacán, Cd. Mx., MEXICO
Humberto Torres Facultad de Ciencias, Universidad Nacional Autónoma de México, Circuito Exterior, 04510, Coyoacán, Cd. Mx., MEXICO
Javier Miranda Instituto de Física, Universidad Nacional Autónoma de México, Apartado Postal 20-364, 01000 Álvaro Obregón, Cd. Mx., MEXICO; Centro de Ciencias de la Atmósfera, Universidad Nacional Autónoma de México, Circuito Investigación Científica, 04510, Coyoacán, Cd. Mx., MEXICO
A. Enrique-Hernandez-Lopez Instituto de Física, Universidad Nacional Autónoma de México, Apartado Postal 20-364, 01000 Álvaro Obregón, Cd. Mx., MEXICO

DOI:

https://doi.org/10.15415/jnp.2017.51003

Keywords:

Ground coffee, Elemental analysis, XRF, Food analysis

Abstract

Coffee is becoming one of the most popular beverages in Mexico. In the present work, X-ray Fluorescence (XRF) was used to determine the contents of several elements (with atomic numbers between 11 and 38) in 11 samples of commercial ground coffee, comparing with another one of soluble coffee and two of used ground coffee. Samples were dried at room temperature and pelletized. XRF analyses were carried out using a spectrometer based on an Rh X-ray tube, registering the characteristic x-rays with a Silicon Drift Detector. The system detection calibration and accuracy check was performed through the analysis of NIST certified reference materials 1547 (peach leaves), 1570a (spinach leaves), 1573a (tomato leaves), and 1571 (orchid leaves). As a general rule, the elemental concentrations measured are similar in all samples of coffee, in values not exceeding toxic levels. However, the differences among the elemental concentrations are shown.

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References

FIRA (2015). Panorama Agroalimentario: Café 2015. Mexico City: Fideicomisos Instituidos en Relación con la Agricultura (in Spanish).

Tavani A., La Vecchia C. (2004) Coffee, decaffeinated coffee, tea and cancer of the colon and rectum: a review of epidemiological studies, 1990–2003. CCC, Cancer Causes Control 15(4), 743–757.

Grembecka M., Malinowska E., Szefer P. (2007) Differentiation of market coffee and its infusions in view of their mineral composition, Science of the Total Environment 383(1), 59–69.

Valentin, J.L., Watling, R.J. (2013) Provenance establishment of coffee using solution ICP-MS and ICP-AES. Food chemistry, 141(1), 98–104.

Antoine, J.M., Fung, L. A. H., Grant, C. N. (2016) Geographic determination of the growing origins of Jamaican and international coffee using instrumental neutron activation analysis and other methods. Journal of Radioanalytical and Nuclear Chemistry, 309(2), 525–534.

Debastiani, R., Dos Santos, C.E.I., Yoneama, M.L., Amaral, L., Dias, J.F. (2014) Ion beam analysis of ground coffee and roasted coffee beans. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 318(2), 202–206.

Martín, M.J., Pablos, F., González, A.G. (1999) Characterization of arabica and robusta roasted coffee varieties and mixture resolution according to their metal content. Food chemistry, 66(3), 365–370.

Romero-Dávila, E., Miranda, J. (2004) Trace element determination in tomato puree using PIXE and Rutherford Backscattering. Journal of Radioanaytical and. Nuclear Chemistry 262(1), 355–362.

Romero-Dávila, E. Miranda, J., Pineda, J. C. (2015) X-ray fluorescence analysis of Mexican varieties of dried chili peppers II: Commercial and home-grown specimens. AIP Conference Proceedings 1671, paper#020006. [10] Romero-Dávila, E. Miranda, J., de Lucio, O.G., Pineda, J.C. PIXE and XRF analysis of commercial breakfast cereals. 24th Conference on Application of Accelerators in Research and Industry, Fort Worth, TX, USA, October 30 to November 4, 2016.

Espinosa, A.A., Reyes-Herrera, J., Miranda, J., Mercado, F., Veytia, M.A., Cuautle, M., Cruz, J.I. (2012) Development of an X-Ray Fluorescence Spectrometer for Environmental Science Applications. Instrumentation Science and Technology 40(3), 603–617.

IAEA (1995). Manual for QXAS. Vienna: International Atomic Energy Agency.

Ranić, M., Konić-Ristić, A., Takić, M., Glibetić, M., Pavlović, Z., Pavlović, M., Dimitrijević-Branković, S. (2015) Nutrient profile of black coffee consumed in Serbia: Filling a gap in the food composition database. Journal of Food Composition and Analysis 40(1), 61–69.

Anderson, K. A., Smith, B. W. (2002) Chemical profiling to differentiate geographic growing origins of coffee. Journal of Agricultural and Food Chemistry 50(7), 2068–2075.