Growing numbers of morbidity and mortality due to the cancer and coronary heart disease is recognized as the increasing challenge in the world. The initial stage of these diseases, early diagnosis and treatment are the main objectives of current researches. According to Lithuanian Health Information Centre morbidity and mortality due to these diseases in Lithuania exceed average of European Union. The oxidative stress occurs in cells as a result of normal physiological processes and environmental interactions, and the complex antioxidant defense system are of particular importance in protecting biological systems against oxidative damage by free radicals. Recently polyphenols and anthocyanins containing foods and preparations have attracted attention due to their health promoting benefits. Anthocyanins make one of the main groups of flavonoids, and represent polyphenolic compounds, that are found in vegetables and fruits, particularly in berries. An important effect of anthocyanins is the scavenging of oxygen-derived free radicals. They can interfere with few different free radical-producing systems, and can increase the function of the endogenous antioxidants. The aim of the research is to choose sources for the products with antioxidant activity from plants cultivated in Lithuania, evaluate quality and antioxidant activity of black currant, red currant and chokeberry products, to develop and evaluate technologies of phytopharmaceuticals with antioxidant activity... [to full text]