DIFFERENCES IN FRUIT QUALITY BETWEEN WHITE AND RED STRAWBERRIES (Fragaria × ananassa Duch.)

Zaradi vse večjega ozaveščanja o zdravi prehrani se vse pogosteje raziskujejo vplivi različnih snovi v sadju in zelenjavi na zdravje. Predvsem je poudarek na fenolnih spojinah, ki vplivajo na zmanjšanje verjetnosti obolenja za rakom in boleznim srca in ožilja. Ker so plodovi žlahntega jagodnjaka zelo priljubljeni pri potrošnikih in vsebujejo precej teh snovi, smo se odločili, da primerjamo tri rdečeplodne sorte žlahtnega jagodnjaka (\u27Clery\u27, \u27Albion\u27 in \u27Eliany\u27) z dvema beloplodnima (\u27Natural albino\u27 in \u27Snow white\u27) sortama. Izmerili smo maso plodov, njihovo trdoto ter barvne parametre. V plodovih smo analizirali vsebnosti sladkorjev, vitamina C, organskih kislin in fenolih spojin. Pri masi plodov so bili statistično značilno najtežji plodovi sorte \u27Albion\u27, najlažji pa plodovi sorte \u27Natural albion\u27. Najmehkejši sorti sta bili \u27Natural albino\u27 in \u27Snow white\u27, ki sta bili mehkejši kar za tri do štiri krat od sorte \u27Albion\u27. Pokazalo se je, da med vsebnostjo skupnih fenolov ni bilo razlik med sortami. Skupnih sladkorjev so največ vsebovali plodovi pri sorti \u27Natural albino\u27. V vsebnosti skupnih organskih kislin med sortami ni bilo razlik. Vsebnost vitamina C je za 24 % večja v plodovih sorte \u27Natural albino\u27, kot v plodovih sorte \u27Eliany\u27, kjer je bila vsebnost najmanjša. Od vseh fenolnih spojin so plodovi obeh belih sort vsebovali več le flavanonov (sorta \u27Natural albino\u27) in derivatov hidroksicimetnih kislin (sorta \u27Snow white\u27), ki predstavljajo le majhen odstotek skupnih analiziranih fenolnih spojin. Plodovi belih sort so vsebovali antocianine le v sledovih. Plodovi sorte \u27Eliany\u27 so vsebovali v povprečju več derivatov hidroksibenzojskih kislin in flavanolov. Plodovi sorte \u27Clery\u27 so vsebovali največ flavonov. Flavonolov so največ vsebovali plodovi sort \u27Clery\u27 in \u27Albion\u27.The awareness of eating healthy food is rising, because of that, there is more studies about influences of different substances in fruits and vegetables on health. The emphasis is on phenolics. They are reducing the chance of some cardiovascular disease and cancer. Because the strawberries are very popular at consumers and they contain a lot of phenolics, we decided that we will compare three red fruited cultivars (\u27Clery\u27, \u27Albion\u27 and \u27Eliany\u27) and two white fruited cultivars (\u27Natural albino\u27 and \u27Snow white\u27). We measured mass, hardness, and colour parameters and analyzed sugars, organic acids, vitamin C and phenolic compounds. The highest fruit mass had cultivar \u27Albion\u27 and the lowest \u27Natural albino\u27. The softest fruits had cultivars \u27Natural albino\u27 and \u27Snow white\u27. They were three to four times softer than the \u27Albion\u27 which had the most firm fruits. The results showed that there is no difference in content of total phenolic contents. Cultivar \u27Natural albino\u27 had the highest content of total sugars. There were no differences between cultivars in total organic acids. The highest content of vitamin C had fruits of \u27Natural albino\u27 (for 24% more than \u27Eliany\u27), while \u27Eliany\u27 had the lowest. White cultivars had highest content of flavanones (\u27Natural albino\u27) and derivates of hidroxycinnamic acids (\u27Snow white\u27). Cultivar \u27Eliany\u27 had higher content of hydroxybenzoic derivatives and flavanols. The highest content of flavones had cultivar \u27Clery\u27. Flavonols content was the highest in cultivars \u27Clery\u27 and \u27Albion\u27