I have been dealing with rapeseed oil extraction by soxtec. sometime when oil content is high, over 40%, there would be oil residue on the thimble, leading inconsistency of the data. Has anyone running into the same problem? What factors may contribute to this? I’m suspecting the extraction time is not long enough and the solvent to sample ratio is not high enough.
Based on your descriptions, it is likely that the extraction time is insufficient for the extraction to be completed. However, it would be difficult to conclude based on color observations. You can try several steps:
(1) Increase the extraction time
(2) Reduce the physical size and / or amount of samples used for extraction
(3) Spike surrogate / internal standards into your samples and cross-check for recovery
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