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A method for analyzing hydrocarbons in animal organs and tissues has been developed. This is made up of the following stages: decomposition of the biological material through alkaline hydrolysis; extraction of non-saponifiable lipids fraction; separation by using preparative thin-layer chromatography of the alkanes and cycloalkanes, monocylic arenes and squalene from the non-saponifiable lipids fractions; determining the content of the alkanes and cycloakanes fraction and also ascertaining the alkanes of normal and isoprenoid structure, by means of gas-liquid chromatography, and, finally, quantification of monocyclic arenes, based on the UV spectra findings. The statistical characteristics obtained through a mathematical processing of the analyses results bear evidence to a sufficient accuracy and good reproducibility of the method stages.