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Effect of freeze-drying on the antioxidant compounds and antioxidant activity of selected tropical fruits.


Citation

Mohamad Shofian, Norshahida and Abdul Hamid, Azizah and Osman, Azizah and Saari, Nazamid and Anwar, Farooq and Pak Dek, Sabri and Hairuddin , Muhammad Redzuan (2011) Effect of freeze-drying on the antioxidant compounds and antioxidant activity of selected tropical fruits. International Journal of Molecular Sciences, 12 (7). pp. 4678-4692. ISSN 1422-0067; ESSN:1422-0067

Abstract

The effects of freeze-drying on antioxidant compounds and antioxidant activity of five tropical fruits, namely starfruit (Averrhoa carambola L.), mango (Mangifera indica L.), papaya (Carica papaya L.), muskmelon (Cucumis melo L.), and watermelon Citruluss lanatus (Thunb.) were investigated. Significant (p < 0.05) differences, for the amounts of total phenolic compounds (TPC), were found between the fresh and freeze-dried fruit samples, except muskmelon. There was no significant (p > 0.05) change, however, observed in the ascorbic acid content of the fresh and freeze-dried fruits. Similarly, freeze-drying did not exert any considerable effect on β-carotene concentration of fruits, except for mango and watermelon, where significantly (p < 0.05) higher levels were detected in the fresh samples. The results of DPPH (2,2-diphenyl-1-picrylhydrazyl) radical scavenging and reducing power assays revealed that fresh samples of starfruit and mango had relatively higher antioxidant activity. In case of linoleic acid peroxidation inhibition measurement, a significant (p < 0.05) but random variation was recorded between the fresh and freeze-dried fruits. Overall, in comparison to β-carotene and ascorbic acid, a good correlation was established between the result of TPC and antioxidant assays, indicating that phenolics might have been the dominant compounds contributing towards the antioxidant activity of the fruits tested.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Food Science and Technology
DOI Number: https://doi.org/10.3390/ijms12074678
Publisher: MDPI
Keywords: Drying process; Fruits antioxidants; Bioactive compounds; Ascorbic acid; HPLC; Antioxidant attributes.
Depositing User: Nur Farahin Ramli
Date Deposited: 04 Dec 2013 02:47
Last Modified: 16 Oct 2015 06:52
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.3390/ijms12074678
URI: http://psasir.upm.edu.my/id/eprint/24035
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