GC-MS analysis of organic residues in the potsherd samples from Vantaa Maarinkunnas
Abstract
In order to examine the origin of organic residues in pot sherd samples, analyses for fat, protein, carbohydrates, and selected minor components were carried out. A total of eleven pot sherd samples were analysed. No protein or carbohydrate residues were detected in the samples. The samples, however, did contain residues of fatty acids, their decomposition products, cholesterol, and benzoic acid identified and quantified by GC-MS analysis. Cholesterol identified in the samples indicates the presence of animal fat. Further, the fatty acid composition, in particular the ratios of 16:0/18:0 and 16:1/18:1 fatty acids, as well as the presence of phytanic acid in the samples, suggest that the fat present is of marine origin. Benzoic acid, a new finding in archaeological contexts, was detected in all eleven samples, suggesting the presence of cranberry or cowberry in the pottery. However, the origin of benzoic acid in archaeological samples requires further research.
