| 摘要: |
| 以小球藻(Chlorela sp.)和三角褐指藻(Phaeodactylum tricornutum)为研究对象，比较了其合成有机物中长链烷烃和脂肪酸的组成和丰度。结果表明，小球藻中的脂肪酸以14:0、16:1、16:0、20:5为主，其中16:0饱和脂肪酸的质量分数为43%，具绝对优势。三角褐指藻中的脂肪酸组成显示16:1、16:0、20:5占优势。其中16:1和16:0两种脂肪酸含量相当。长链烷烃在两种藻中均以低碳链分布，优势组分集中在C16～C21碳链之间。小球藻中C17 |
| 关键词: 海洋微藻 脂肪酸 长链烷烃 |
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| 基金项目:国家自然科学基金资助项目（40476038） |
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| Comparative study of fatty acid and n-alkane compositions in two phytoplankton species |
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| Abstract: |
| The compositions and abundances of fatty acids and n-alkanes were measured for two marine phytoplanktons Chlorela sp. and Phaeodactylum tricornutum. Our results indicate that the short chain saturated and monosaturated fatty acids, 14:0, 16:0, 16:1 comprised major fraction of the detected fatty acids in the two algae species. In addition, 18:0, 18:1 and 20:5 also showed relatively high abundances in Chlorela sp. and 20:5 in P. tricornutum. Compared with fatty acids, the abundance of n-alkanes was much lower in the two algae species and was predominated by the short chain C16～C23 compounds. The composition and distribution characteristics of fatty acid and n-alkanes in Chlorela sp. and P. tricornutum could play certain roles in their ecological significance. Our results also confirm the efficiency of using fatty acids and n-alkanes as biomarkers to distinguish organic matter sources in marine sediments. |
| Key words: marine microalgae fatty acids n-alkanes |
