Determination of trace amounts of impurities in pharmaceutical preparations by differential-pulse polarography: Part 1. Determination of Diisooctyl maleate (cas 1330-76-3) in the pharmaceutical sodium 1,4-bis(2-ethylhexyl)sulphosuccinate and of maleic acid in fumaric acid

Add time:08/17/2019    Source:sciencedirect.com

A differential-pulse polarographic procedure is described for the determination of impurities such as Diisooctyl maleate (cas 1330-76-3) and maleic acid in pharmaceutical products. The concentration range for diisooctyl maleate is 1 × 10 −6−30 × 10−6 μg ml−1 and the detection limit is 0.2 μg ml−1; for maleic acid the detection limit is 0.15 μg ml−1. It is possible to determine very low concentrations of maleic acid in the presence of fumaric acid by a preseparation by dissolution in water, in which fumaric acid dissolves to only a small extent.

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