Sea surface temperature determinations based on marine sedimentary C₃₇ alkenone distributions have provided a wealth of data for paleoclimatic studies, including those performed at high resolution. The success of this approach results from several characteristics of alkenone compounds, e.g. their geochemical properties (such as unequivocal synthesis by certain widespread haptophyte algae, plus chemical stability/preservation of the original alkenone distributions during sedimentation), and their analytical properties (such as fast clean up procedures using alkaline hydrolysis of sediment extracts, followed by robust instrumental methods allowing large scale sample processing). Here we show that, in sediments under the influence of continental inputs, coelution of these compounds with cholest-5-enyl 3β-undecenyl ether and 24-methylcholesta-5,22-dienyl 3β-undecenyl ether deviate the SST measurements despite alkaline hydrolysis. Here, we report a new high performance liquid chromatrography fractionation method which eliminates these interfering compounds and gathers all the alkenones into a single fraction. These fractions can then be analysed by gas chromatography as in the initial approach, providing large amounts of data as required in high resolution studies.

基于海洋沉积物C _37的海面温度确定烯酮的分布为古气候研究提供了丰富的数据，包括高分辨率的数据。该方法的成功源于烯酮化合物的几个特征，例如它们的地球化学特性（例如某些广泛的触藻类藻类的明确合成，以及沉积过程中原始烯酮的化学稳定性/保留）以及它们的分析特性（例如快速）。使用沉淀物提取物的碱水解进行清理程序，然后使用强大的仪器方法进行大规模样品处理）。在这里，我们表明，在受大陆输入影响的沉积物中，这些化合物与胆甾5-烯基3β-十一碳烯醚和24-甲基胆甾5共同洗脱，尽管发生碱水解，但22-二烯基3β-十一碳烯醚仍会偏离SST测量值。在这里，我们报告了一种新的高效液相色谱分离方法，该方法消除了这些干扰化合物并将所有烯酮收集到一个馏分中。然后可以像最初方法一样通过气相色谱法分析这些馏分，从而提供高分辨率研究所需的大量数据。