“…A number of procedures have been published for the analysis of the various parabens (181,191,211,231) and oil bases and mixtures (101,111,161) used as pharmaceutical additives. Gas chromatographic assays have appeared for acetone in (hydroxyethyl) starches (141), methanol and methylene residues in coated tablets (271), and chlorbromuron herbicide residues in drugs (241). Also problems associated with USP XX GC determination of ethanol in drug formulations also have been discussed (31).…”