Determination of antioxidative activity of the aronia fruit and juice from the harvest year 2013.

Aronija je biljka koja predstavlja jedan od najbogatijih izvora polifenolnih komponenata. Najveći udjel polifenolnih tvari čine antocijani, proantocijani i flavonoli te su upravo ono odgovorni za povoljan preventivan učinak plodova aronije na kardiovaskularne bolesti, dijabetes i rak debelog crijeva. Cilj ovog istraživanja bio je određivanje antioksidacijske aktivnosti uzoraka aronije. U tu svrhu ispitan je sok i svježa aronija kojima je određen udio ukupnih fenola, neflavonoida, flavonoida, antocijana i antioksidacijski kapacitet. Udio ukupnih fenola određen je Folin-Ciocalteu metodom, a antioksidacijski kapacitet primjenom DPPH i FRAP metoda. Svježa aronija ima gotovo dvostruko veći udjel ukupnih fenola u odnosu na uzorak soka. Najveći antioksidacijskii kapacitet određen primjenom DPPH metode pokazuje svježa aronija. Antioksidacijski kapacitet određen primjenom FRAP metode je isti u svježoj aroniji i soku.Aronia melanocarpa (chokeberry) is a plant that is one of the richest sources of polyphenolic components. The largest share of polyphenolic compounds come from anthocyanins, flavonols and proanthocyanins which are responsible for the beneficial preventive effect of chokeberry on cardiovascular disease, diabetes and colon cancer. The aim of this study was to determine the antioxidant activity of samples chokeberry. For this purpose, aronia juice and fresh aronia fruits were tested to determine concentration of total phenols, non flavonoids, anthocyanins and antioxidant capacity. The concentration of total phenols was determined by the Folin-Ciocalteu method and antioxidant capacity using the DPPH and FRAP methods. Fresh aronia fruits has almost double the share of total phenols in comparison to a sample of juice. The highest antioxidant capacity determined by using DPPH method showed fresh aronia fruits. Antioxidant capacity determined by the FRAP method is the same in fresh chokeberry and chokeberry juice