Faculty of Food Technology and Biotechnology, University of Zagreb
Abstract
Bright black (Morus nigra) and purple mulberry (Morus rubra) are particularly desirable fruits in Turkey. More recently, the interest in these bright black and purple mulberry fruits has also increased because of the popularization of healthy properties of these fruits. The study was carried out in 2008 aiming to determine the antioxidant activity (ferric reducing ability of plasma, FRAP), total phenolic, total anthocyanin, mineral, soluble solid, vitamin C, and total acid content of four black and four purple mulberry genotypes grown in Turkey. The results show that black mulberry genotypes have a higher bioactive content than purple mulberry genotypes. The average total phenolic content and total anthocyanins of black mulberry genotypes were 2149 μg of gallic acid equivalent (GAE) per g and 719 μg of cyanidin 3-glucoside equivalent (Cy 3-glu) per g of fresh mass. In purple mulberry, these values were for GAE 1690 μg/g and for Cy 3-glu 109 μg/g on fresh mass basis. The average antioxidant activity of black mulberry genotypes was also found to be higher than that of the purple ones according to FRAP assay (Trolox equivalent (TE) per fresh mass of black and purple mulberries was 13.35 and 6.87 μmol/g, respectively).Crni (Morus nigra) i crveni dud (Morus rubra) vrlo su popularno voće u Turskoj. Zbog pozitivnog utjecaja na ljudsko zdravlje, sve je veći interes za crnim i crvenim dudom. Istraživanje je provedeno 2008 godine, a određivala se antioksidativna aktivnost (FRAP), ukupni fenoli, ukupni antocijani, mineralni sastav, topljiva suha tvar, vitamin C i ukupna kiselost četiriju crnih i četiriju crvenih genotipova duda uzgajanih u Turskoj. Rezultati pokazuju da genotipovi crnog duda imaju veći udjel bioaktivnih tvari nego genotipovi crvenih dudova. Prosječna je količina ukupnih fenola u genotipovima crnog duda iznosila 2149 µg/g galne kiseline kao ekvivalent, a količina ukupnih antocijana 719 µg/g cijanidin 3-glukozidnog ekvivalenta. U genotipovima crvenog duda ove su vrijednosti za ukupne fenole iznosile 1690 µg/g, a za cijanidin 3-glukozidni ekvivalent 109 µg/g svježe mase plodova. Prosječna antioksidativna aktivnost genotipova crnog duda također je bila veća nego genotipova crvenog duda (Trolox ekvivalent svježe mase crnog i crvenog duda bio je 13,35 i 6,87 µmol/g)
