Total Phenolic Content, Antioxidative, Anti-amylase, Anti-glucosidase, and Antihistamine Release Activities of Bangladeshi Fruits
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To seek out a cheap source of dietary polyphenols and antioxidants along with anti-amylase and anti-glucosidase activities, ethanol extracts of eleven cheap Bangladeshi fruits were investigated. The extracts were also examined for anti-allergic activity using rat peritoneal exudate cells exposed to the calcium ionophore A23187. <I>Phyllanthus emblica</I> (emblic myrobalan) had the highest total polyphenol content (339 mg gallic acid equivalent (GAE)/g), followed by <I>Syzygium cumini</I> (Indian blackberry; 192.3 mg GAE/g), and <I>Aegle marmelos</I> (wood apple; 53.7 mg GAE/g).<I> P. emblica</I>, and <I>S. cumini</I> also exhibited the most potent DPPH radical scavenging activity, with an IC<SUB>50</SUB> of 2.1 and 8.6 μg/mL respectively. These extracts also showed promising reducing powers with <I>P. emblica</I> having the greatest such activity (optical density (O.D.) 1.66), followed by <I>S. cumini</I> (O.D. 1.34), at a concentration of 0.2 mg/mL. The extracts of <I>Artocarpus heterophyllus</I> (jackfruit) and <I>S. cumini</I> showed promising chelating activities. At a concentration of 1 mg/mL, <I>Dillenia indica</I> (chalta) showed the highest inhibition of α-amylase activity (60%), and <I>A. marmelos</I>, <I>D. indica</I>, <I>P. emblica</I>, <I>Spondias dulcis</I> (hog-plum) & <I>S. cumini</I> completely inhibited α-glucosidase activity (100%). Apart from <I>A. heterophyllus</I>, <I>D. indica</I> and <I>Phyllanthus acidus</I> (star-gooseberry), all other extracts inhibited the release of histamine from the peritoneal exudate cells, with <I>S. cumini</I> having the strongest effect. These fruits therefore have activities beneficial to physiological health.
- Food Science and Technology International, Tokyo
Food Science and Technology International, Tokyo 14(3), 261-268, 2008-05-01
Japanese Society for Food Science and Technology