title: Antioxidant Content, Antioxidant Activity, and Antibacterial Activity of Five Plants from the Commelinaceae Family.
abstract: Commelinaceae is a family of herbaceous flowering plants with many species used in ethnobotany, particularly in South America. However, thus far reports of their bioactivity are few and far between. The primary aim of this study was to quantify the antioxidant and antibacterial activity of five Commelinaceae methanolic leaf extracts. The antioxidant content was evaluated by the total phenolic content (TPC), total tannin content (TTC), and total flavonoid content (TFC) assays. The antioxidant activities measured were DPPH free radical scavenging (FRS), ferric reducing power (FRP), and ferrous ion chelating (FIC); of the five plants, the methanolic leaf extract of Tradescantia zebrina showed the highest antioxidant content and activity, and exhibited antibacterial activity against six species of Gram-positive and two species of Gram-negative bacteria in a range of 5-10 mg/mL based on the broth microdilution method.
authors.affiliation: School of Science, Monash University Sunway Campus, Bandar Sunway 46150, Malaysia. tan.ban.lee@monash.edu.
authors.forename: Joash Ban Lee
authors.initials: JB
authors.lastname: Tan
authors.affiliation: School of Science, Monash University Sunway Campus, Bandar Sunway 46150, Malaysia. wjyap4@student.monash.edu.
authors.forename: Wei Jin
authors.initials: WJ
authors.lastname: Yap
authors.affiliation: School of Science, Monash University Sunway Campus, Bandar Sunway 46150, Malaysia. sytan89@student.monash.edu.
authors.forename: Shen Yeng
authors.initials: SY
authors.lastname: Tan
authors.affiliation: School of Science, Monash University Sunway Campus, Bandar Sunway 46150, Malaysia. lim.yau.yan@monash.edu.
authors.forename: Yau Yan
authors.initials: YY
authors.lastname: Lim
authors.affiliation: School of Science, Monash University Sunway Campus, Bandar Sunway 46150, Malaysia. lee.sui.mae@monash.edu.
authors.forename: Sui Mae
authors.initials: SM
authors.lastname: Lee
keywords: Commelinaceae; antibacterial; antioxidant; methanolic extracts