Oxidative stress is a damaging process that can be an important mediator of damage to cell structures and can cause various disease states and ageing. Antioxidative measurements are conducted for the diagnosis and the treatment of diseases associated with antioxidative stress, for comparison of foods with respect to their antioxidant content and for controling variations between products. Unique and versatile reactivity and stability of boronic acids have led to the uses in many areas. Several unique properties of boronic acids, such as low toxicity, make them suitable for biomedical applications. This paper investigated the compounds of the class of boronic acids and the main task was to test these compounds as potential antioxidants. To determine the antioxidant capacity, a CUPRAC method was used which was based on the reduction of Cu (II) complexes in the presence of antioxidants. Measurements were performed on methyl boronic acid, phenyl boronic acid and 2,4,6-trifluorophenyl boronic acid. Methyl boronic acid can be a slow- reacting antioxidant, but since no change in color has occurred after 60 minutes it can be concluded that it does not have a noticeable antioxidative potential. From the results it can be concluded that 2,4,6- trifluorophenyl boronic acid has a higher antioxidative capacity than phenyl boronic acid.