alexa In Vitro Antioxidant Activities of Extracts of Bauhinia strychnifolia Stems and Leaves: Comparison with Activities in Green Tea Extracts | OMICS International
ISSN: 2167-0412

Medicinal & Aromatic Plants
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Research Article

In Vitro Antioxidant Activities of Extracts of Bauhinia strychnifolia Stems and Leaves: Comparison with Activities in Green Tea Extracts

Itharat A1,2*, Sayompark S1, Hansakul P2,3 and Dechayont B1,2
1Department of Applied Thai Traditional Medicine, Faculty of Medicine, Thammasat University, Pathumthani 12120, Thailand
2Center of Excellence on Applied Thai Traditional Medicine Research (CEATMR), Thammasat University, Pathumthani 12120, Thailand
3Department of Preclinical Science, Faculty of Medicine, Thammasat University, Pathumthani 12120, Thailand
Corresponding Author : Itharat A
Department of Applied Thai Traditional Medicine
Faculty of Medicine, Thammasat University
Pathumthani 12120, Thailand
Tel: +6629269749
Fax: +6629269705
E-mail: [email protected]
Received February 26, 2016; Accepted March 21, 2016; Published March 29, 2016
Citation: Itharat A, Sayompark S, Hansakul P, Dechayont B (2016) In Vitro Antioxidant Activities of Extracts of Bauhinia strychnifolia Stems and Leaves: Comparison with Activities in Green Tea Extracts. Med Aromat Plants 5:243. doi:10.4172/2167-0412.1000243
Copyright: © 2016 Itharat A, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

Dried stems and leaves of Yha-nang dang (Bauhinia strychnifolia Craib.) have long been used in Thailand to make tea for promoting health and for detoxification of the body. The objectives of this study were to investigate antioxidant activities of B. strychnifolia dried stem and leaf extracts obtained by different extraction methods. The antioxidant power of B. strychnifolia extracts and water extracts of green tea leaves (Camellia sinensis) were evaluated using four different methods: DPPH radical scavenging assay, Ferric reducing antioxidant power (FRAP) assay, and Superoxide radical scavenging by NBT dye reduction assay, and measurement of total phenolic contents by the Folin-Ciocalteu colorimetric method. The 95% ethanolic extract of B. strychnifolia stems exhibited the strongest DPPH radical scavenging activity, with an EC50 value of 4.2 μg/ml. This was in agreement with results from the Ferric reducing antioxidant power assay, which showed that this extract had the highest FRAP value and TEAC (Trolox equivalent antioxidant capacity) values of 1481.2 mg Fe(II)/g and 421.4 mg Trolox/g, respectively. The 50% ethanolic extracts of B. strychnifolia stems showed the highest superoxide radical scavenging activities with an EC50 value of 85.7 μg/ml. The total phenolic contents of all extracts ranged from 143.7 to 390.1 mg GAE/g. The 95% ethanolic extract of B. strychnifolia stems had the highest total phenolic contents (390.1 mg GAE/g). Green tea water extracts showed less antioxidant activity than 95% ethanol B. strychnifolia stem extracts, by all assays, except by the DPPH assay. The results from this study indicate that ethanolic extracts of B. strychnifolia stems are rich in phenolic content and demonstrate as good, or better antioxidant activities compared to green tea. This lends scientific support for the use of these extracts for detoxification by Thai traditional medicine practitioners, and suggests that they could be further developed into commercial detoxification products.

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