At the present stage, when various technogene factors, as well as natural and techno-natural processes significantly affect the human body, the protections of the human health represent a global problem of the society. The causes of various environmental-health problems are numerous and include the pollution from transport, agricultural activities, industrial processes and waste management. The formation of free radicals and the oxidative stress are the causes of degradations at biological, chemical, genetical and psychological level in the human body. The antioxidant substances, preferably of natural origin, are an effective remedy to combat the harmful action of the free radicals. The research on the development of biologically active substances, obtained from vegetable raw materials, useful for the protection of the human health is one of the priority direction of the contemporary scientific community. The plants produce a wide range of active compounds that provide an important pharmacological effect. They are the main source for many essential efficacious drugs. Amongst various plant sources of antioxidants [1,2], sawdust from wood processing companies is a valuable raw material for obtaining of natural polyphenolic compounds, which possess remarkable antioxidant properties. The bioactive compounds were obtained by using the extraction of the plant product-solvent (50% alcohol) in an ultrasonic field for 30 minutes. In order to improve the physico-chemical properties of the extracted compounds, some structural modifications were performed on them, in accordance with the procedure of the polymerization reaction [3] that was accompanied by the formation of new organic compounds with increased values of antioxidant activity and content of acidic functional groups. To determine the antioxidant properties of the novel compounds, the method of chemiluminescence (CL) in the luminescence generating system Luminol-H2O2 was used. Solutions of 0,1% concentration of the novel compound, including also Luminol (1 mM), H2O2 (0.2 mM) were prepared and Tris-HCl of pH 8.6 was used as buffer. The results of the study aimed at establishing the new antioxidant activity of the modified compound, demonstrated that these values are quite high AA=60%, which allows us to conclude that the new compound is attractive for future microbiological and pharmacological research.