title: Effects of Different Drying Methods and Storage Time on Free Radical Scavenging Activity and Total Phenolic Content of Cosmos Caudatus.
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.
authors.affiliation: Department of Food Science, Faculty of Food Science and Technology, Universiti Putra Malaysia, 43400 Serdang, Malaysia. medianiahmed47@gmail.com.
authors.forename: Ahmed
authors.initials: A
authors.lastname: Mediani
authors.affiliation: Department of Food Science, Faculty of Food Science and Technology, Universiti Putra Malaysia, 43400 Serdang, Malaysia. faridah_abas@upm.edu.my.|Laboratory of Natural Products, Institute of Bioscience, Universiti Putra Malaysia, 43400 Serdang, Malaysia. faridah_abas@upm.edu.my.
authors.forename: Faridah
authors.initials: F
authors.lastname: Abas
authors.affiliation: Department of Food Technology, Faculty of Food Science and Technology, Universiti Putra Malaysia, 43400 Selangor, Malaysia. tancp@putra.upm.edu.my.
authors.forename: Chin Ping
authors.initials: CP
authors.lastname: Tan
authors.affiliation: Laboratory of Natural Products, Institute of Bioscience, Universiti Putra Malaysia, 43400 Serdang, Malaysia. alfikhatib1971@gmail.com.|Faculty of Pharmacy, International Islamic University Malaysia, 25200 Kuantan, Malaysia. alfikhatib1971@gmail.com.
authors.forename: Alfi
authors.initials: A
authors.lastname: Khatib
keywords: Cosmos caudatus; drying; free radical scavenging activity; storage; total phenolic content