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Analysis of beers from Brazil with synchrotron radiation total reflection X-ray fluorescence |
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| Authors: | S. Moreira A. E. S. Vives O. L. A. D. Zucchi E. F. O. de Jesus V. F. Nascimento Filho S. M. B. Brienza |
| Affiliation: | 32501. State University of Campinas, FEC/UNICAMP, P. O. Box 6021, 13083-852 Campinas, Brazil 32502. Methodist University of Piracicaba, FEAU/UNIMEP, Rodovia Sta.Bárbara/Iracemápolis km 1, 13450-000 Sta.Bárbara D'Oeste, Brazil 32503. University of S?o Paulo, FCFRP/USP, Avenida do Café s/n, 14040-903 Ribeir?o Preto, Brazil 32504. Federal University of Rio de Janeiro, COPPE/UFRJ, P.O. Box 68501, 21945-970 Rio de Janeiro, Brazil 32505. University of S?o Paulo, CENA/USP, P.O. Box 96, 13400-970 Piracicaba, Brazil 32506. Methodist University of Piracicaba, FEAU/UNIMEP, Rodovia Sta.Bárbara/Iracemápolis km 1, 13450-000 Sta.Bárbara D'Oeste, Brazil |
| Abstract: | Summary In this study the concentrations of P, S, Cl, K, Ca, Mn, Fe, Zn and Br in twenty-nine brands of national and international beers were determined by synchrotron radiation total reflection X-ray fluorescence analysis (SR-TXRF). The results were compared with the limits established by the Brazilian legislation and the nutritional values established by National Agricultural Library (NAL, USA). The measurements were performed at the X-Ray Fluorescence Beamline at Brazilian National Synchrotron Light Laboratory, in Campinas, S?o Paulo, Brazil, using a polychromatic beam for excitation. A small volume of 5 ml of beers containing an internal standard used to correct geometry effects was analyzed without pretreatment. The measuring time was 100 seconds and the detection limits obtained varied from 1 mg . l-1 for Mn and Fe to 15 mg . l-1 for P. |
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