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Effects of drying on total polyphenols content and antioxidant properties of Carica papaya leaves


Yap, Jing Ying and Ching, Lik Hii and Sze, Pheng Ong and Kuan, Hon Lim and Abas, Faridah and Pin, Kar Yong (2020) Effects of drying on total polyphenols content and antioxidant properties of Carica papaya leaves. Journal of the Science of Food and Agriculture, 100 (7). 2932 - 2937. ISSN 0022-5142; ESSN: 1097-0010


Background: Papaya is widely grown in Malaysia and normally only the fruits are consumed. Other parts of the plant such as leaves, roots, bark, peel, seeds and pulp are also known to have medicinal properties and have been used to treat various diseases. Papaya leaves also contain flavonoids, alkaloids phenolic compounds and cynogenetic compounds, and are also reported to be able to treat dengue fever. Results: Studies were carried out on drying of papaya leaves using hot air (60, 70 and 80 °C), shade and freeze drying. Effective diffusivities were estimated ranging from 2.09 × 10-12 to 2.18 × 10-12 m2 s-1 from hot air drying, which are within the order of magnitudes reported for most agricultural and food products. The activation energy to initiate drying showed a relatively low value (2.11 kJ mol-1 ) as a result of the thin leave layer that eased moisture diffusion. In terms of total polyphenols content and antioxidant activities, freeze-dried sample showed a significantly higher (P < 0.05) total polyphenols content [2158 mg gallic acid equivalent 100 g dry weight-1 ] and antioxidant activities [2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) = 571 mg TE 100 g DW-1 and 2,2'-diphenyl-1-picrylhydrazyl (DPPH) = 215 μg mg-1 ] compared to hot air and shade dried samples. Conclusion: Freeze dried sample retained the most total polyphenols content and showed the highest antioxidant activities in both ABTS and DPPH antioxidant assays. Hot air and shade drying are not conducive with repect to preserving the antioxidants as a result of possible thermal degradation at elevated temperatures and oxidations under prolonged drying condition.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Food Science and Technology
DOI Number: https://doi.org/10.1002/jsfa.10320
Publisher: Wiley
Keywords: Carica papaya; Antioxidants; Diffusivity; Papaya leaves; Polyphenols
Depositing User: Ms. Nuraida Ibrahim
Date Deposited: 03 Nov 2021 21:51
Last Modified: 03 Nov 2021 21:51
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1002/jsfa.10320
URI: http://psasir.upm.edu.my/id/eprint/88699
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