@article {514, title = {In vitro Antioxidant Activities and Polyphenol Contents of Seven Commercially Available Fruits}, journal = {Pharmacognosy Research}, volume = {8}, year = {2016}, month = {August 2016}, pages = {258-264}, type = {Original Article}, chapter = {258}, abstract = {

Background: Fruits are considered one of the richest sources of natural antioxidants. Their consumption has been linked to the prevention of oxidative stress-induced diseases. Objective: In this study, in vitro antioxidant activities of blueberry, jackfruit, blackberry, black raspberry, red raspberry, strawberry, and California table grape extracts were evaluated. Materials and Methods: Antioxidant activities were determined by 2,2-diphenyl-1-picrylhydrazyl (DPPH), ferric reducing antioxidant potential (FRAP), 2,2'-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS), nitric oxide (NO), superoxide anion (O2 -) scavenging assays, and ferric reducing power. Results: Black raspberry extract had the highest phenolic (965.6 {\textpm} 2.9 mg gallic acid equivalents [GAE]/g), flavonoid (186.4 {\textpm} 1.7 mg quercetin equivalents/g), and proanthocyanidin (2677 {\textpm} 71.1 mg GAE/g) contents. All fruit extracts exhibited increasing radical scavenging activities with increased concentrations. At 100 μg/ml, red raspberry extract showed the highest ferric reducing power (A700 = 0.3 {\textpm} 0.0052) and FRAP activity (A593 = 11.43 mM Fe2+/g). Black raspberry extract (100 μg/ml) exhibited the highest DPPH activity (A517 = 89.03 {\textpm} 0.0471). Jackfruit extract (100 μg/ml) had the highest ABTS (A734 = 35.6 {\textpm} 0.613), NO (A540 = 81.7 {\textpm} 0.2), and O2 - radical scavenging (A230 = 55.5 {\textpm} 0.2) activities. Positive correlations were observed between IC50 values for different radical scavenging activities and different polyphenolics. Red raspberry extract had the highest Pearson{\textquoteright}s coefficient values (0.952{\textendash}1) between total phenolics, flavonoids, and proanthocyanidins and DPPH and superoxide radical scavenging activities. Conclusions: The antioxidant rich fruits in this study are good source of functional food and nutraceuticals that have the potential to improve human health.

}, keywords = {Antioxidant activity, Flavonoids, IC50, Phenols, Proanthocyanidins, radical scavenging}, doi = {10.4103/0974-8490.188875}, author = {Paramita Basu and Camelia Maier} }