Antioxidant and antibacterial activity of Rhoeo spathacea (Swartz) Stearn leaves

The decoction and infusion of Rhoeo spathacea (Swartz) Stearn leaves have been recognized as a functional food particularly in South America, but has not yet gained international popularity as a beverage. The primary aim of this study was to establish the viability of R. spathacea aqueous leaf extra...

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Bibliographic Details
Published in:Journal of food science and technology 2015-04, Vol.52 (4), p.2394-2400
Main Authors: Tan, Joash Ban Lee, Lim, Yau Yan, Lee, Sui Mae
Format: Article
Language:English
Subjects:
Analysis
Antibiotics
Antimicrobial agents
Antioxidants
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Efficiency
Flavonoids
Food
Food Science
Functional foods & nutraceuticals
Gonorrhea
Heat
Hemoglobin
Herbal tea
Herbs
Laboratories
Leaves
Liquid chromatography
Neisseria gonorrhoeae
Nutrition
Original
Original Article
Phenols
Phytochemicals
Plant extracts
Potassium
Reagents
Rhoeo spathacea
Staphylococcus aureus
Staphylococcus infections
Studies
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Summary:The decoction and infusion of Rhoeo spathacea (Swartz) Stearn leaves have been recognized as a functional food particularly in South America, but has not yet gained international popularity as a beverage. The primary aim of this study was to establish the viability of R. spathacea aqueous leaf extracts as a beverage, in terms of its antioxidant activity and antibacterial activity. The antioxidant contents of aqueous and methanol leaf extracts were evaluated by the total phenolic content (TPC) and total flavonoid content (TFC) assays. The antioxidant activities measured were DPPH radical scavenging activity (FRS), ferric reducing power (FRP) and ferrous ion chelating (FIC) activity. The aqueous leaf extracts in the forms of decoction and infusion, were found to have comparable TPC and antioxidant activity with other herbal teas previously reported by our research group. Both decoction and infusion also exhibited antibacterial activity against six species of Gram positive and four species of Gram negative bacteria, notably methicillin-resistant Staphylococcus aureus and Neisseria gonorrhoeae . A total of four different known phenolic compounds were identified by HPLC and MS, three of which have not been previously reported to be found in this plant. Both the decoction and infusion of the leaves R. spathacea have potential to be popularized into a common beverage.
ISSN:0022-1155
0975-8402
DOI:10.1007/s13197-013-1236-z