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

Ahmed Mediani,Chin Tan,Alfi Khatib,Faridah Abas

doi:10.3390/antiox3020358

Ahmed Mediani, Chin Tan + Show 2 more

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https://doi.org/10.3390/antiox3020358

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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.

Highlights

Cosmos caudatus is a traditional vegetable locally known as “ulam raja” in Malaysia and is named “kenikir” in Indonesia, “tagalog” in the Philippines and “daoruang-phama” in Thailand
Pleasant aroma and green color of the C. caudatus sample when the sample was processed, which was maintained between each drying method, the air-dried sample displayed the features to the highest degree
The onset of plant metabolite degradation potentially begins at harvest, and the continuing activity of enzymes would contribute to the variation in antioxidant power of a plant after that

Summary

Introduction

Cosmos caudatus is a traditional vegetable locally known as “ulam raja” in Malaysia and is named “kenikir” in Indonesia, “tagalog” in the Philippines and “daoruang-phama” in Thailand. The plant originated from tropical Central America and belongs to the Asteraceae family [1]. It is a large annual plant, approximately 1.5 m tall, with pleasant, colorful flowers and beautifully shaped leaves. It is considered an herb and vegetable of great importance in traditional medicine and nutrition among the populations of tropical countries, especially in Malaysia. “Ulam raja” grows quickly and in fertile soil, and it does not need much attention during the growing period; it is of great prominence to the people of tropical regions for its nutritional, medicinal and economical values. It is considered to be a vital component of the daily diet

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