%0 Journal Article
%T Effect of Freeze-Drying on the Antioxidant Compounds and Antioxidant Activity of Selected Tropical Fruits
%A Norshahida Mohamad Shofian
%A Azizah Abdul Hamid
%A Azizah Osman
%A Nazamid Saari
%A Farooq Anwar
%A Mohd Sabri Pak Dek
%A Muhammad Redzuan Hairuddin
%J International Journal of Molecular Sciences
%D 2011
%I MDPI AG
%R 10.3390/ijms12074678
%X 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 ¦Â-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 ¦Â-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.
%K drying process
%K fruits antioxidants
%K bioactive compounds
%K ascorbic acid
%K HPLC
%K antioxidant attributes
%U http://www.mdpi.com/1422-0067/12/7/4678