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In vitro antioxidant activity and phenolic profiles of tropical fruit by-products |
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| Authors: | Nhat Minh Phuong Nguyen Thien Trung Le Hanne Vissenaekens Gerard Bryan Gonzales John Van Camp Guy Smagghe Katleen Raes |
| Affiliation: | 1. Department of Food Technology, Safety and Health, Ghent University, Coupure Links 653, Ghent, 9000 Belgium
Department of Food Engineering, Faculty of Food Science and Technology, Nong Lam University, Block 6, Ward Linh Trung, Thu Duc District, Ho Chi Minh City, Vietnam Department of Food Technology, College of Agriculture, Can Tho University, Campus 2, 3/2 Street, Ward An Khanh, Ninh Kieu District, Can Tho City, Vietnam;2. Department of Food Engineering, Faculty of Food Science and Technology, Nong Lam University, Block 6, Ward Linh Trung, Thu Duc District, Ho Chi Minh City, Vietnam;3. Department of Food Technology, Safety and Health, Ghent University, Coupure Links 653, Ghent, 9000 Belgium Department of Plants and Crops, Ghent University, Coupure Links 653, Ghent, 9000 Belgium;4. Department of Food Technology, Safety and Health, Ghent University, Coupure Links 653, Ghent, 9000 Belgium;5. Department of Plants and Crops, Ghent University, Coupure Links 653, Ghent, 9000 Belgium |
| Abstract: | Peel and seeds of red-skinned passion fruit, mango, longan, rambutan, white-flesh and red-flesh dragon fruit were screened for their in vitro antioxidant activity, and determination of a detailed profile of phenolic compounds. Rambutan peel and mango seed extracts exhibited the highest total phenolic content and antioxidant activities (DPPH, ABTS and FRAP values). By using UPLC-QTOF-MS/MS analysis, the profiles of soluble and bound phenolics in the fruit by-products were obtained. Ellagic acid, geraniin, quercetin hexoside, gallic and galloyshikimic acid were predominant in rambutan peel, whereas, mangiferin, ellagic acid and galloy(di)glucoside were the major phenolic compounds in mango seed. Main phenolic compounds in longan peel were ellagic acid, galloyldiglucoside, and gallic acid, while in dragon fruit peel this was isorhamnetin glycoside, isorhamnetin glucorhamoside. Meanwhile, rutin and quercetin hexoside were predominant in passion fruit peel. These findings contribute significantly to the database of phenolic profiles of by-products of tropical fruits. |
| Keywords: | Antioxidant activity bound phenolics phenolic profile soluble phenolics tropical fruits by-products UPLC-QTOF-MS/MS |