Quantification of essential fatty acids in the heads of nile tilapia (Oreochromis niloticus) fed with linseed oil

Journal of the Brazilian Chemical Society

Ana C. Aguiar¹  Solange M. Cottica²  Marcela Boroski²  Cláudio C. Oliveira¹  Elton G. Bonafé²  Polyana B. França¹  Nilson E. Souza²  Jesui V. Visentainer² 

[1] ,Universidade Estadual de Maringá Departamento de Química Maringá PR ,Brazil

关键词: tilapia head;    linseed oil;    fatty acids;    quantification;    correction factor;   

DOI  :  10.1590/S0103-50532011000400005

来源: SciELO

【 摘 要 】

The objective of this study was to examine the effects of linseed oil on n-6 and n-3 polyunsaturated (PUFA) fatty acid content in the heads of Nile tilapia (Oreochromis niloticus), these are normally discarded during the filleting process. The quantification of PUFA was carried out in absolute weights through the use of methyl ester (23:0), as an internal standard, and TCFx (theoretical FID correction factor) by GC gas chromatography. Tilapias were given diets with increasing levels (0.00, 1.25, 2.50, 3.75 and 5.00%) of linseed oil as a replacement for sunflower oil (control) for a period of five months. The ingestion of LNA causes sequential desaturation and elongation in fish heads, leading to an increase in all n-3 PUFAs. This experiment demonstrated clearly that adding linseed oil to the feed of Nile tilapia can markedly increase the amounts (per 100 g-1 of head) of LNA (100.8 to 973.6 mg), EPA (4.8 to 82.1 mg), and DHA (24.0 to 125.4 mg) in their heads, and thus, may be used to help balance n-6/n-3 PUFA ratios in dietary supplements, and creating a valuable alternative food source in the human diet.

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