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| Oil content and fatty acid composition of six kinds of common edible dragonfly naiads |
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| KeyWord:edible dragonfly naiad oil content fatty acid composition ratio of n-6 PUFA to n-3 PUFA EPA DHA |
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| Abstract: |
| In order to evaluate the nutritional value of common edible dragonfly naiads in Yunnan and Guizhou provinces, the oil content and fatty acid composition of Epophthalmia elegans, Anax Parthenope Julius,Ictinogomphus rapax, Pantala flavescens, Sinictinogomphus clavatus and Orthetrum pruinosum neglectum were analyzed by Soxhlet extraction method and GC-MS. The results showed that the oil contents of six kinds of dragonfly naiads were 5.72%-11.90%. The oil contents of Sinictinogomphus clavatus and Orthetrum pruinosum neglectum were the highest and the lowest respectively. 18-29 kinds of fatty acids were identified, including odd-number carbon fatty acids, EPA and DHA, which had special functions. The unsaturated fatty acids (UFA) accounted for 61.50%-65.22%of total fatty acids and the polyunsaturated fatty acids (PUFA) accounted for 29.57%-50.00%of total UFA. The contents of hexadecanoic acid were the highest, which were 17.57%-24.61%. The ratios of n-6 PUFA to n-3 PUFA were 0.68-1.30, which were similar to the freshwater fish oils. The ratios of saturated fatty acid to monounsaturated fatty acid to PUFA in Pantala flavescens and Orthetrum pruinosum neglectumwere 1.17∶1.2∶1 and 1.3∶1.18∶1, which were close to the ratios recommended by the North Atlantic Treaty Organization and the American Heart Association(1∶1.5∶1 and (0.8-1) ∶1.5∶1) |
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