Characterization of Brazilian commercial milks by instrumental neutron activation analysis |
| |
Authors: | L G C Santos E A De Nadai Fernandes F S Tagliaferro M A Bacchi |
| |
Institution: | 1. Centro de Energia Nuclear na Agricultura, Universidade de S?o Paulo (CENA/USP), P.O. Box 96, 13400-970, Piracicaba, Brazil
|
| |
Abstract: | Aiming at the determination of toxic and essential elements in Brazilian commercial bovine milk, 25 ultra high temperature
(UHT) milk samples were acquired in the local market of Piracicaba, SP. The samples were freeze-dried and analyzed by instrumental
neutron activation analysis (INAA) allowing the determination of Br, Ca, Co, Cs, Fe, K, Na, Rb and Zn. When the results were
expressed as concentration (mg·l−1) no significant differences were found. However, considering the dry matter, results showed a clear difference between the
mass fractions (mg·kg−1 d.w.) of skim milk and whole milk for the elements Br, Ca, K, Na, Rb and Zn, indicating that the removal of fat caused a
concentration effect in the dry matter of skim milks. Discrepancies were found between the concentrations of Ca and Na measured
by INAA and the values informed in the labels. Ca showed variations within 30% for most samples, while concentrations of Na
were up to 190% higher than informed values. The sample preparation and the INAA procedure were appropriate for the determination
of Br, Ca, Co, Cs, Fe, K, Na, Rb and Zn in milk samples. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|