Zolkiffly, Nur Diyana (2019) Determination of total phenolic content, total flavonoid content and antioxidant capacity in raw and cooked potato, sweet potato and taro. [Project Paper] (Submitted)
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Abstract
Natural antioxidants are widely distributed in tubers and root crops. The effective proper assessment of antioxidants from food and medicinal plants is crucial to explore the potential antioxidant sources and promote the application in functional food study. Potatoes, sweet potatoes and taro contained compounds such as polyphenol which may have healthpromoting effects. In this study, the flesh tissues of those three tubers and roots varieties were treated with the thermal process (frying, steaming and boiling). Higher levels of total phenolics, total flavonoids and antioxidant activity were found in the flesh of all tubers, depending on the thermal process applied. When the thermal process was applied, fried samples showed the highest values in all potato and taro, as well in antioxidant activity markedly higher in sweet potato variety. The total phenolic content in potato flesh was 18.88 - 66.58 mg/g gallic acid equivalents, 28.06 - 90.01 mg/g gallic acid equivalents in sweet potato and 8.22 - 40.22 mg/g gallic acid equivalents for total phenolics in taro flesh. Meanwhile, the total flavonoid content in potato was reported within 4.75 -15. 75 mg/g catechin equivalents,9.25-18.75 mg/g catechin equivalents in sweet potato and the least total flavonoids were count in taro, ranging from 1.75-8.80 mg/g ca tech in equivalents. Strong positive correlations were found among total phenolics, total flavonoids and antioxidant activity but there is no significant result of these three sample using beta-carotene bleaching assay. Harvest process, storage and tubers maturity may also significantly affected the parameters studied. The present study provides a piece of idea and information on the determination of phenolic, flavonoid and antioxidant capacity in selective potato, sweet potato and taro.
| Item Type: | Project Paper |
|---|---|
| Subjects: | T Technology > TX Home economics |
| Faculty: | Faculty of Medicine and Health Science |
| Depositing User: | Ms Norafizah Radzuan |
| Date Deposited: | 21 May 2026 08:12 |
| Last Modified: | 21 May 2026 08:12 |
| URI: | http://psaspb.upm.edu.my/id/eprint/2826 |
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