Antioxidant Capacity of Indigenous Root and Tuber Crops of Sri Lanka as Affected by Simple Processing

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dc.contributor.author Rupasingha, Poojanee
dc.contributor.author Ratnayake, Kamani
dc.contributor.author Senarathne, Anoma
dc.date.accessioned 2021-04-22T03:49:23Z
dc.date.available 2021-04-22T03:49:23Z
dc.date.issued 2020
dc.identifier.citation Asian Food Science Journal 19(2): 18-27, 2020; Article no.AFSJ.62797 en_US
dc.identifier.issn 2581-7752
dc.identifier.uri http://repository.wyb.ac.lk/handle/1/3111
dc.description.abstract The indigenous root and tuber crops in Sri Lanka have not been exploited by the food industry. With a view to establish their nutritional importance and promote consumption and industry usage, this study determined the contents of selected bio active compounds and antioxidant properties in 15 root and tuber crops varieties namely, Amorphophallus paeoniifolius, Canna indica (2 Selections), Dioscorea alata (6 varieties), D. bulbifera, D. esculenta, Maranta arundinacea and Xanthosoma sagittifolium (3 varieties), both in their raw and processed (boiled) forms. Antioxidant capacity (AOC) of yams was determined by Ferric Reducing Antioxidant Power (FRAP) Assay and 2,2-diphenyl-1-picrylhydrazyl (DPPH) Radical Scavenging Assay. Total phenolics (TPC) and ascorbic acid contents (AAC) were determined by Folin-Ciocalteu method and 2,6-dichlorophenol indophenol visual titration method, respectively. Chemical analyses were performed on triplicate samples. The AOC in the raw form ranged from 56 mg TE/g dry weight (D. bulbifera) to 30 mg TE/g dry weight (M. arundinaceae) while it showed a 0.4% (D. alata ‘Raja ala’) to 45% (D. alata‘Hingurala’) decrease when boiled. The TPC in the raw form was highest in D. bulbifera (190.5 GAE; mg/100 g) while it was lowest in D. esculenta (6 mg/100 g). Dioscorea alata ‘Jaffna Rasawalli’ showed the highest loss (95%) of phenolics when subjected to boiling. The Xanthosoma sagittifolium varieties ‘Kiri ala’ and ‘Isuru’ had the highest AAC (12 mg/100 mg) in raw form while it was lowest (2 mg/100 mg) in M. arundinaceae. D. bulbifera and X. sagittifolium ‘Kaha kiri ala’ retained relatively higher levels of antioxidants in their boiled forms. The contents of bioactive compounds in yams tended to decrease when subject to boiling. However, the degree of loss depended on the yam variety. Further research should focus on developing processing technologies to minimize the loss of bioactive compounds in root and tuber crops. en_US
dc.language.iso en en_US
dc.subject Antioxidants en_US
dc.subject ascorbic acid en_US
dc.subject boiling en_US
dc.subject indigenous roots and tubers en_US
dc.subject phenolics en_US
dc.subject processing en_US
dc.title Antioxidant Capacity of Indigenous Root and Tuber Crops of Sri Lanka as Affected by Simple Processing en_US
dc.type Article en_US


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