The organic extracts recovered from 14 potsherds of Dressel 20 oil amphorae collected from Pax Julia civitas (Lusitania) were analysed by GC–MS. Biomarkers of plant oils (saturated and unsaturated fatty acids, alcohols and alkanes arising from plant waxes) were identified in ten samples, and Pinaceae spp. pitch biomarkers were also identified in eight samples. The biomarkers identified in the studied Dressel 20 suggest that, even considering re-use, these amphorae should have been used for the same commodity, i.e., storage/transport of a plant oil. The presence of pitch in the amphorae could only be explained if it was used to reduce the porosity of the ceramic paste and minimise the oil diffusion through it.

中文翻译：

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在罗马时代运输橄榄油：来自卢西塔尼亚 Pax Julia Civitas 的 Dressel 20 Amphorae 的色谱分析

从 Pax Julia civitas (Lusitania) 收集的 14 块 Dressel 20 油双耳瓶中回收的有机提取物通过 GC-MS 进行分析。在 10 个样品中鉴定了植物油的生物标志物（饱和和不饱和脂肪酸、植物蜡产生的醇和烷烃），松科 spp。还在八个样品中鉴定了音调生物标志物。在所研究的德雷塞尔 20 中确定的生物标志物表明，即使考虑重复使用，这些双耳瓶也应该用于相同的商品，即植物油的储存/运输。沥青在双耳瓶中的存在只有在它被用来减少陶瓷膏的孔隙率并最大限度地减少通过它的油扩散时才能解释。