A procedure is described for determination of residual acetone and hexane in cottonseed and soybean meals and flours by extraction of the residual solvent with dimethyl formamide (DMF)‐water (95∶5) followed by gas liquid chromatography analysis of the DMF extracts. A representative group of samples was analyzed both by this procedure and one employing iso‐octane as extractant. In all cases where residual solvent was found, the amount was markedly greater when aqueous DMF was the extracting solvent.
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Fore et al. (1970) studied this question.
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