Antioxidant activity in selected Slovenian organic and conventional crops | Antioksidativna učinkovitost v pridelkih iz slovenske ekološke in konvencionalne pridelave

English. The demand for organically produced food is increasing. There is widespread belief that organic food is substantially healthier and safer than conventional food. According to literature organic food is free of phytopharmaceutical residues, contain less nitrates and more antioxidants. The aim of the present study was to verify if there are any differences in the antioxidant activity between selected Slovenian organic and conventional crops. Method of DPPH (2,2-diphenyl-1-picryhydrazyl) was used to determine the antioxidant activity of 16 samples from organic and conventional farms. The same varieties of crops were analysed. DPPH method was employed to measure the antioxidant activity of polar antioxidants (AAp) and antioxidant activity of fraction in ethyl acetate soluble antioxidants (EA AA). Descriptive statistics and variance analysis were used to describe differences between farming systems. Estimated differences between interactions for the same crop and different farming practice were mostly not statistically significant except for the AAp for basil and beetroot. Higher statistically significant values were estimated for conventional crops. For the EA AA in broccoli, cucumber, rocket and cherry statistically significant higher values were estimated for organic production.

Slovenian. Povpraševanje po ekološko pridelanih živilih se povečuje. Ekološki proizvodi veljajo za bolj zdrave v primerjavi s konvencionalnimi. Po navajanju drugih virov ne vsebujejo fitofarmacevtskih sredstev imajo manjšo vsebnost nitratov in vsebujejo več antioksidantov. Namen študije je bil preveriti ali obstajajo razlike v antioksidativni učinkovitosti med slovenskimi pridelki pridelanimi na ekološki in konvencionalni način. Za določevanje antioksidativne učinkovitosti smo uporabili metodo DPPH (2,2-difenil-1-pikrilhidrazil). Analiza je bila opravljena na 16 vrstah iste sorte pridelkov iz ekološke in konvencionalne pridelave. Izmerili smo polarno antioksidativno učinkovitost (AAp) in antioksidativno učinkovitost v etil-acetatu topnih antioksidantov (EA AA). Izračunali smo osnovne statistične parameter po vrstah pridelkov in načinu kmetovanja in z analizo variance ocenili razlike med načinoma kmetovanja za posamezne pridelke. Ocenjene razlike med interakcijami pridelka in načina kmetovanja večinoma niso statistično značilne. Izjema za AAp sta bazilika in rdeča pesa, kjer so bile večje vrednosti za konvencionalne pridelke. Za vrednost EA AA so bile statistično značilno večje vrednosti ocenjene za ekološki brokoli, kumaro, rukolo in češnjo.