Mineral composition, omegas and lipid quality in the visceral fat residues of tambaqui (Colossoma macropomum Cuvier, 1818)

Abstract

This study aimed to determine the mineral composition, fatty acid profile, omegas and lipid quality indexes in the visceral fat residues of tambaqui (C. macropomum). Three pieces of visceral fat were collected from 20 fish weighing 1.10 ± 0.10 kg, which were homogenized and sent for compositional analysis. Minerals were determined by AOAC Official method 969.23 and 968.08. The fatty acids were grouped to calculate the ΣPUFAs/ΣSFAs fatty acids ratio and the proportion of polyunsaturated fatty acids ΣPUFAs (n-6/n-3), atherogenicity indixes (AI) were calculated, thrombogenicity (TI), and ratio between hypocholesterolemic and hypercholesterolemic fatty acids (HH). Mineral elements were found, 0.68 ± 0.015 mg/100g of total iron, 159.16 ± 14.32 mg/100g of Na+, 63.90 ± 5.11 mg/100g of K+, 10.28 ± 0. 62 mg/100g of Ca2+ and 7.31 ± 0.58 mg/100g of Mg2+. As for fatty acids, 40.10% of SFAs, 38.10% of MUFAs and 21.80% of PUFAs. The calculations indicated significant values of omegas, 3, 6, 7 and n-7. There were ΣPUFAs/ΣSFAs ratios of 1.84 and ΣPUFAs (n-6/n-3) of 6.22, with an AI of 0.50 and a TI of 0.93 and HH of 2.16. The 1.0 ± 0.10 kg tambaqui visceral fat residues can be evaluated as having high nutritional value, in addition to being a viable option for oil extraction and inclusion in animal feed.