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Clinical Chemistry 28: 1765-1768, 1982;
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Clinical Chemistry, Vol 28, 1765-1768, Copyright © 1982 by American Association for Clinical Chemistry

Enzymic and chemical-extraction determinations of free fatty acids in serum compared

PN Demacker, AG Hijmans and AP Jansen

We compared an enzymic test kit for determination of free fatty acids in serum (NEFA C-test, WAKO) with two modifications of a chemical extraction procedure, I (Clin. Chim. Acta 43: 317-320, 1973) and II (Clin. Chim. Acta 80: 327-332, 1977). All three procedures are specific for long- and medium-chain fatty acids. Short-chain fatty acids, some keto acids, and phospholipids did not interfere. Added fatty acid was quantitatively accounted for in all methods. Results obtained with the enzymic method and II did not differ significantly, whereas the results by I were about 10% lower. The concentration of NaCl in the copper reagent, but not the kind of solvent used to dissolve the standard, influenced the accuracy of the chemical methods. In the enzymic procedure, hydrolysis of triglycerides during incubation is unlikely to be the reason for too-high values. The precision of all three procedures is acceptable for use in clinical laboratories.


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