摘要：Owing to interest in the role of antioxidants in human health which has prompted research to assess fruit and their products antioxidants, such as vitamin C and phenolics and also because of increment in commercial fruit juices consumption, the objectives of present study were to determine and compare the total polyphenol and vitamin C contents of natural fresh and commercial fruit juices. Folin-Ciocalteu assay and Spectrophotometric method were used to measure the total polyphenol and vitamin C . The concentrations of total polyphenol were ranging from 23.75±1.6 to 420.69±4.9 mg/100 ml for fresh and 18.57±3 to 381.9±3.4 mg/100 ml for commercial juices with lowest amount in apricot and the highest amount in pomegranate juices in both sources. Significant differences (p<0.05) were observed in the polyphenol contents of peach, pomegranate, grapefruit and orange between fresh and commercial juices. The vitamin C levels of fresh juices were ranging from 14.31 for apricot to 24.51 mg/100 ml for orange juices and those of commercial were from 13 for mango to 17.29 mg/100 ml for pomegranate juices. The mean vitamin C contents of fresh juices were higher than those of commercial but these differences were not significant. Although various juices differed markedly in the quantity of polyphenol and vitamin C , they can be considered as a good source of these components.
