Abstract
SummaryThe acetone‐permanganate oxidation method for determination of GS3 has been shown to be unreliable because some hydrolysis of the azelaoglycerides occurs, the products of which are determined as GS3. The presence of excess acetic acid throughout the oxidation corrects this defect. GS2A can be precipitated quantitatively as the magnesium salt. Although it is contaminated with GSA2, its proportion can be calculated and from this the proportion of GS2U in the sample can be found.The remainder of the precipitate is GSA2; its weight, when added to that found in the filtrates, gives the total GSA2. From this, the percentage of GSU2 in the sample can be derived. The GS3 is determined separately, and the content of GU3 can be estimated by difference.
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