Selenium determination in tissue samples of Nile tilapia using ultrasound-assisted extraction

Author(s)

Silva, Fabio A. ^[1] ; Padilha, Cilene C. F. ^[2] ; de Castro, Gustavo Rocha ^[3] ; Roldan, Paulo dos Santos ^[4] ; de Araujo Nogueira, Ana R. ^[5] ; Moraes, Paula M. ^[6] ; Padilha, Pedro M. ^{[6, 7]}

Affiliation

^[1] FMVZ UNESP, Postgrad Program Zootechny, BR-15385000 Botucatu, SP - Brazil

^[2] IB UNESP, Dept Phys & Biophys, BR-18618970 Botucatu, SP - Brazil

^[3] FEIS UNESP, Dept Chem & Phys, BR-15385000 Ilha Solteira, SP - Brazil

^[4] Univ Fed Alagoas, Inst Chem & Technol, Maceio, AI - Brazil

^[5] GAIA EMBRAPA PECUARIA SUDESTE, BR-13560970 Sao Carlos, SP - Brazil

^[6] IB UNESP, Dept Chem & Biochem, BR-18618970 Botucatu, SP - Brazil

^[7] Univ Estadual Campinas, Natl Inst Bioanalyt Sci & Technol, BR-13084971 Campinas, SP - Brazil

• Document type: Journal article
• Source: CENTRAL EUROPEAN JOURNAL OF CHEMISTRY; v. 9, n. 1, p. 119-125, FEB 2011.
• Web of Science Citations: 6

Abstract

This paper proposes a method to determine selenium in samples of fish muscle and liver tissue using ultrasound assisted extraction process, and analysed by graphite furnace atomic absorption spectrometry (GFAAS). The selenium content was extracted by 0.10 M HCl at the optimal extraction conditions which were established as follows: sample mass of 100 mg; granulometry of the sample < 60 A mu m; sonication time of five 40 s cycles; and sonication power of 136 W. The selenium determinations were performed by GFAAS, at a drying temperature of 120A degrees C/250A degrees C, pyrolysis temperature of 1300A degrees C, atomization temperature of 2300A degrees C, and cleaning temperature of 2800A degrees C. Palladium nitrate was used as a chemical modifier coinjected with the samples, and tungsten as a permanent modifier. The concentration of selenium determined in the pool of fish muscle and liver tissue were 280.4 +/- 4.2 e 592.3 +/- 6.7 mu g kg(-1), respectively. The accuracy and precision of the proposed extraction method were evaluated using certified standard Bovine Muscle - NIST 8414. The results obtained by the ultrasonic extraction method were equivalent to those obtained by the method of acid mineralization of samples in a microwave oven. (AU)

• FAPESP's process: 07/59778-0 - Development of analytical methods for evaluation of Nile tilapia (Oreochromis niloticus) metalloproteins
• Grantee: Pedro de Magalhães Padilha
• Support Opportunities: Regular Research Grants