improvement of phenolic compound extraction by using ion exchange chromatography and evaluation of biological activities of polyphenol-enriched fraction of <i>rosa canina</i> fruits

Background: rosa canina has been traditionally known as a medicinal plant. different applications of fruits (rose hip) comprise the food, perfume, and cosmetic industries. objectives: this study aimed to prepare an enriched polyphenolic fraction from rosa canina in addition to its biological activities. methods: poly phenolic enriched fraction was prepared using amberlite xad-7 for removing unwanted components. phenols, flavonoids, and anthocyanins content analyses showed that they increased significantly compared to the extract. hplc analysis showed that this fraction is a rich source of ascorbic acid. results: the results of the dpph, ferric-reducing antioxidant power (frap), abts, and nitric oxide assay confirmed that the antioxidant activities of the fraction had been increased compared to the extract. the oxygen radical absorbance capacity (orac) assay and cellular antioxidant activity of the fraction also confirmed its potential antioxidant activity. this fraction showed xanthine oxidase inhibitory activity at 100 µg/ml concentration. comet assay analysis revealed that this fraction at 25 - 100 µg/ml concentrations inhibited h2o2 genotoxicity in human lymphocytes. conclutions: this study suggests that the fruit of rosa canina could be considered as a potential antioxidant, a xanthine oxidase inhibitor, and an antigenotoxic source, and the application of amberlite xad-7 improves extraction efficiencies through enrichment of phenolic compounds in this plant.