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This can occur with samples that are very low in fat. Moisture left in low-fat samples after extraction is the issue. As AOCS Procedure AM 5-04 indicates, when the Filter Bags are removed from the Extractor, they should be placed in an oven at 100...
Crude Fat results could be low for any of the following reasons: The extraction was not run long enough. The sample was not post-extraction dried enough. Fat migrated from a bag during the pre-dry step. Desiccant was either not used or incorrectly...
There are three primary reasons for high Crude Fat results. (1) The bag is not completely sealed; therefore the sample gets lost during extraction. (2) A bag picks up surface fat from another sample. (3) Incomplete drying in the pre-extraction phase...
Research with high fat samples has given us the following understandings: Some samples with fats that have low melting point triacylglycerides or emulsifiers may encounter fat migration during hydrolysis. To improve fat retention, increase the level...