Marine Research Institute (CSIC), c/E. Cabello, 6, 36208 Vigo, Spain.
Food Technology, Faculty of Science, University of Vigo, 32004 Ourense, Spain.
Mar Drugs. 2024 Feb 24;22(3):105. doi: 10.3390/md22030105.
The presence of bioactive compounds in European eel () 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 ( < 0.05) levels of proteins (271.6 g·kg), lipids (38.0 g·kg), ash (27.7 g·kg), and ω6 FAs were observed in the skin tissue. Contrary, the muscle tissue showed higher ( < 0.05) moisture, ω3 FA, and ω3/ω6 ratio values. Regarding lipid classes, a higher ( < 0.05) proportion of phospholipids (111.1 g·kg lipids), free sterols (104.7 g·kg lipids), α-tocopherol (274.0 mg·kg lipids), and free FAs (43.6 g·kg lipids) was observed in the skin tissue. No differences ( > 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.
研究了欧洲鳗鱼（）皮肤中生物活性化合物的存在。测定了近似和脂质类别的组成以及脂肪酸（FA）谱的分析（单个 FA；FA 组，即饱和、单不饱和和多不饱和；FA 比，即多不饱和/饱和，ω3/ω6），并与鳗鱼肌肉的组成进行了比较。结果表明，皮肤组织中蛋白质（271.6 g·kg）、脂质（38.0 g·kg）、灰分（27.7 g·kg）和 ω6 FAs 的含量较高（<0.05）。相反，肌肉组织的水分、ω3 FA 和 ω3/ω6 比值较高（<0.05）。关于脂质类别，皮肤组织中磷脂（111.1 g·kg 脂质）、游离固醇（104.7 g·kg 脂质）、α-生育酚（274.0 mg·kg 脂质）和游离 FA（43.6 g·kg 脂质）的比例较高（<0.05）。两种组织在三酰甘油和 FA 组（饱和、单不饱和和多不饱和）值以及多不饱和/饱和 FA 比值方面没有差异（>0.05）。研究结果表明，欧洲鳗鱼皮是商业加工的副产品，可作为食品和制药行业的有价值原料，提供附加值成分，如蛋白质、脂质、ω3 FA、磷脂和 α-生育酚。
