Factors influencing the determination of the acetone insolubles of commercial lecithins

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Abstract
Summary: Data are presented from numerous analyses of commercial lecithins for the comparison of values obtained from the determination of acetone insolubles by a direct weighing method against those by the A.O.C.S. Tentative Method Ja 4–46. Discrepancies introduced into these methods by the use of petroleum ether as a solventand those due to the solubility of acetone insoluble compounds in the acetone extract and wash solution are evaluated. A proposal is made for the consideration of a direct weighing procedure for the acetone insolubles content of commercial lecithins whereby petroleum ether is eliminated, the acetone extract solution saturated with pure phosphatides before use, and the insoluble residue dried and weighed.

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