Portions of several previously reported methods have been combined, condensed, and modified to provide a rapid, simple procedure for determining chlorinated organic pesticide residues in nonfatty foods. The method is believed to be applicable to 21 pesticides in a variety of foods. Results are reported for 5 pesticides in 11 foods.

Modifications to the glucosamine (GlcN) analysis method for the quantification of fungal material in cereal grains are described. The rnodifications improve recovery of GlcN, increase reliability of the method and reduce analytical time.Key words: Glucosamine, fungal material, grain I Modification de la m6thode i la glucosamine pour la quantification de

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An elution solvent system is presented which can replace the currently used mixtures of ethyl ether-petroleum ether in the Florisil column chromatographic cleanup for pesticide residue analyses. Three eluants consisting of different mixtures of methylene chloride, hexane, and acetonitrile give greatly improved cleanup for extracts of fats and oils and recover pesticide chemicals of a greater range of polarity than do the ethyl ether-petroleum ether eluants. Fifty chemicals are known to be essentially completely recovered. Data are presented on fractional elution of representative compounds and on efficiency of removal of fatty substances. The proposed system has performed satisfactorily as a replacement for the ethyl ether-petroleum ether eluants in the analyses of a variety of representative foods for organochlorine pesticides.

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