The Presence of Bioactive Compounds in European Eel (<i>Anguilla anguilla</i>) Skin: A Comparative Study with Edible Tissue
Antía Bote | Marcos Trigo | Sidonia Martínez | Santiago P. Aubourg
The presence of bioactive compounds in European eel (<i>Anguilla anguilla</i>) skin was studied. Proximate and lipid class compositions and analysis of the fatty acid (FA) profile (individual FAs; FA groups, i.e., saturated, monounsaturated, and polyunsaturated; FA ratios, i.e., polyunsaturated/saturated, ω3/ω6) were determined and compared to the composition of the eel muscle. As a result, higher (<i>p</i> < 0.05) levels of proteins (271.6 g·kg<sup>−1</sup>), lipids (38.0 g·kg<sup>−1</sup>), ash (27.7 g·kg<sup>−1</sup>), and ω6 FAs were observed in the skin tissue. Contrary, the muscle tissue showed higher (<i>p</i> < 0.05) moisture, ω3 FA, and ω3/ω6 ratio values. Regarding lipid classes, a higher (<i>p</i> < 0.05) proportion of phospholipids (111.1 g·kg<sup>−1</sup> lipids), free sterols (104.7 g·kg<sup>−1</sup> lipids), α-tocopherol (274.0 mg·kg<sup>−1</sup> lipids), and free FAs (43.6 g·kg<sup>−1</sup> lipids) was observed in the skin tissue. No differences (<i>p</i> > 0.05) between both tissues could be detected for triacylglycerol and FA group (saturated, monounsaturated, and polyunsaturated) values and for the polyunsaturated/saturated FA ratio. It is concluded that European eel skin, a by-product resulting from commercial processing, can be considered a valuable source for the food and pharmaceutical industries by providing value-added constituents such as proteins, lipids, ω3 FAs, phospholipids, and α-tocopherol.
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