For understanding of physiological-biochemical condition of seeds the analytically directed researches are important.For representation of a complete picture of a vegetative organism,getting of information on the seeds level plays the special role.From the literary data it is known that both qualitative and quantitative characteristics defining metabolic feature of a seed are specific for each separately taken plant.The important component is presence of activators and inhibitors adjusting a metabolism,defining specific specificity and efficiency of plants.In this connection,a cotton-plant with presence of endogenous inhibitor of reaction – gossypol (2,2-di,1,6,7-trioxy-3-methyl-5-isopropyl- 8-aldehyderonaphthyl) presents special interest.Gossypol – specific for Gossypium type compound of polyphenol nature.It is being formed from the first days of cotton growth and is present in all vegetative and generative bodies.As the molecule has numerous functional groups (hydroxyl, aldehyde),depending on environment where the reaction takes place,it can be an acceptor and the donor of electrons.Gossypol has rather high oxidation-reduction potential (Во=0,77) close to oxygen potential (Во=0,82) and participates in cell respiration processes as one of key interim electron carrier.Due to this,it was important to conduct parallel research between the presence in the cotton seeds extract of phenol compound and free fat acids (in particular,oleic acid).