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First Report of Δ5,8,11,14,17-Octadecapentaenoic Acid (18:5n-1) in Diatoms (Bacillariophyceae: Thalassiosirales)
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DOI：10.1002/lipd.70055.png)
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Abstract
En 中文
In this study, we report the first detection of a unique Delta 5,8,11,14,17-octadecapentaenoic acid (18:5n-1) in six diatom species (Thalassiosirales). The fatty acid was detected by GC-MS and GC-FID analyses using nonpolar capillary column SH-Rtx-5 ms (30 m & times; 0.25 mm, 0.25 mu m; Shimadzu, USA) and polar capillary column Supelcowax-10 (30 m & times; 0.25 mm, 0.25 mu m; Supelco, USA), respectively. Mass spectral analysis of 4,4-dimethyloxazoline (DMOX) derivative of this fatty acid indicated the presence of double bonds at Delta 5, 8, 11, and 14 positions, while the position of the terminal double bond (Delta 17) was inferred. The calculated and experimental equivalent chain lengths (ECL) were highly consistent, supporting the structural identification. To date, 18:5n-1 has not been described in diatoms, though previously detected in particulate organic matter samples and concentrated fish oil. The consistent occurrence of 18:5n-1 in the analyzed species suggests that it may represent a potential chemotaxonomic marker in diatoms, although its distribution across other diatom taxa remains to be established.
Keywords:
diatom
gas chromatography
octadecapentaenoic acid
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