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Antioxidants 2014, 3(2), 358-370; doi:10.3390/antiox3020358
Article

Effects of Different Drying Methods and Storage Time on Free Radical Scavenging Activity and Total Phenolic Content of Cosmos Caudatus

1
,
1,2,* , 3
 and
2,4
1 Department of Food Science, Faculty of Food Science and Technology, Universiti Putra Malaysia, 43400 Serdang, Malaysia 2 Laboratory of Natural Products, Institute of Bioscience, Universiti Putra Malaysia, 43400 Serdang, Malaysia 3 Department of Food Technology, Faculty of Food Science and Technology, Universiti Putra Malaysia, 43400 Selangor, Malaysia 4 Faculty of Pharmacy, International Islamic University Malaysia, 25200 Kuantan, Malaysia
* Author to whom correspondence should be addressed.
Received: 17 February 2014 / Revised: 7 April 2014 / Accepted: 24 April 2014 / Published: 7 May 2014
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Abstract

The present study was conducted to determine the effect of air (AD), oven (OD) and freeze drying (FD) on the free radical scavenging activity and total phenolic content (TPC) of Cosmos caudatus and the effect of storage time by the comparison with a fresh sample (FS). Among the three drying methods that were used, AD resulted in the highest free radical scavenging activity against 1,1-diphenyl-2-picrylhydrazyl (DPPH) (IC50 = 0.0223 mg/mL) and total phenolic content (27.4 g GAE/100 g), whereas OD produced the lowest scavenging activity and TPC value. After three months of storage, the dried samples showed a high and consistent free radical scavenging activity when compared to stored fresh material. The drying methods could preserve the quality of C. caudatus during storage and the stability of its bioactive components can be maintained.
Keywords: Cosmos caudatus; free radical scavenging activity; total phenolic content; drying; storage Cosmos caudatus; free radical scavenging activity; total phenolic content; drying; storage
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Mediani, A.; Abas, F.; Tan, C.P.; Khatib, A. Effects of Different Drying Methods and Storage Time on Free Radical Scavenging Activity and Total Phenolic Content of Cosmos Caudatus. Antioxidants 2014, 3, 358-370.

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