Abstract
This study aimed to compare the total phenolic (TPC), flavonoid (TFC), radical scavenging and cytotoxic activities in the aqueous methanolic extracts of Angelica sinensis, Dioscorea polystachya, Ginkgo biloba, Glycyrrhiza uralensis and Lycium barbarum with two dietary plants: Brassica oleracea and Zingiber officinale. The TPC and TFC in medicinal plant extracts were 12–93% lower than Z. officinale as follows: L. barbarum > G. uralensis > A. sinensis > G. biloba > D. polystachya. The decreasing radical scavenging activity in medicinal plant extracts shared similar trend: G. uralensis > L. barbarum > A. sinensis > G. biloba > D. polystachya. Both TPC and TFC were positively correlated with radical scavenging and cytotoxic activities. All medicinal plants were considered inactive (LC50 > 0.2 mg/ml) and safe for consumption. The TPC, TFC, radical scavenging and cytotoxic activities in the medicinal plants were plant-part dependant, in particular L. barbarum and G. uralensis.
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