Determination of methanol residues in crude glycerol for animal feed by gas chromatography
نویسندگان
چکیده
منابع مشابه
Determination of thyreostatics in animal feed by micellar electrokinetic chromatography.
The determination of the thyreostatics 2-thiouracil, its derivatives (4-methyl-2-thiouracil, 4-propyl-2-thiouracil and 4-phenyl-2-thiouracil) and methimazole in manufactured dried animal feed by micellar electrokinetic chromatography (MEKC) is described. A 99 +/- 5% extraction yield at the 20 micrograms g-1 level (n = 8) was achieved by shaking the milled fodder with methanol-1 M NaOH (80 + 20)...
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A LC/MS/MS method was developed for determining florfenicol and chloramphenicol in animal feed. The analytes were extracted with ethyl acetate, and the extracts were evaporated to dryness. The residue was dissolved in acetone-hexane mixture and passed through a silica cartridge and a SPE cartridge. The collected eluant was evaporated and the residue was dissolved in acetonitrile-water mixture f...
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A sensitive liquid chromatographic method for the determination of doxycycline in animal tissues has been prepared and validated. The extraction of the analyte from biological matrix was performed with the solution of oxalic acid and ethyl acetate. The samples were cleaned up by solid phase extraction (SPE) procedure using a carboxylic acid cartridge. Chromatographic separation was carried out ...
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A sensitive and specific gas chromatographic-mass spectrometric method for the determination of clenbuterol in urine and liver samples is described. Prepared for confirmatory purposes, this method includes solid phase extraction for clean up of biological samples, derivatization and analysis of the clenbuterol derivatives in the selected ion monitoring mode. During the studies, six derivatizati...
متن کاملDetermination of 3,6-dichloropicolinic acid residues in soil by gas chromatography of the 1-butyl ester.
Since 3,6-dichloropicolinic acid is simil8r to picloram, the method developed previously for picloram by McKone and Cotterill (1974) was examinedo This method~ like that of Pik and Hodgson, uses diazomethane for methylationo However~ the methyl ester of 3 87 acid is sufficiently volatile for losses fo occur during the final concentration stepo This report shows how tbe difficulty tan be overcom...
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ژورنال
عنوان ژورنال: Scientia Agricola
سال: 2019
ISSN: 1678-992X
DOI: 10.1590/1678-992x-2017-0362