Levels of copper in Nile tilapia from Brazil

The purpose of this work was to determine the concentration of copper in samples of farmed Nile tilapia (Oreochromis niloticus L.) fillets purchased in the city of Botucatu (São Paulo, Brazil) and in fillet and liver samples of Tilapia fed diets supplemented with different concentrations of Cu from...

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Bibliographic Details
Published in:Food additives & contaminants Part B, Surveillance communications Surveillance communications, 2011-12, Vol.4 (4), p.238-243
Main Authors: Neves, Renato C.F, Moraes, Paula M, Ferrari, Jeisson E.M, Lima, Paula M, Santos, Felipe A, de Castro, Gustavo Rocha, Barros, Margarida M, Padilha, Pedro M
Format: Article
Language:English
Subjects:
animal feed
Animals
atomic absorption spectrometry
atomization
Biological and medical sciences
Brazil
cleaning
Copper
Copper - analysis
diet
drying temperature
Extraction processes
Feed and pet food industries
feeding
fillets
fish
Food industries
Food science
freeze drying
Fundamental and applied biological sciences. Psychology
grinding
hydrochloric acid
liver
mineral
nitrates
Oreochromis niloticus
palladium
pyrolysis
Regulation
Scientific imaging
Spectrophotometry, Atomic
Tilapia
tungsten
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Summary:The purpose of this work was to determine the concentration of copper in samples of farmed Nile tilapia (Oreochromis niloticus L.) fillets purchased in the city of Botucatu (São Paulo, Brazil) and in fillet and liver samples of Tilapia fed diets supplemented with different concentrations of Cu from the Laboratory of Aquatic Organism Nutrition/FMVZ-UNESP (Botucatu, Brazil). The fillet samples were prepared by lyophilisation and cryogenic grinding into particles smaller than 60 µm, and copper was extracted ultrasonically using 0.10 mol l⁻¹ HCl as extraction solution. Copper determination was performed by graphite furnace atomic absorption spectrometry (GFAAS) with optimised temperatures of drying, pyrolysis, atomisation and cleaning. Palladium nitrate was injected into the samples as a chemical modifier and tungsten as a permanent modifier. Copper concentrations of 0.70–1.60 mg kg⁻¹ were found, which are in line with Brazilian regulations. The accuracy and precision of the copper concentrations determined in this study were evaluated using certified standard Lake Michigan fish tissue (NIST SRM 1947).
ISSN:1939-3229
1939-3210
1939-3229
DOI:10.1080/19393210.2011.632693