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Molecules 2011, 16(9), 7302-7319; doi:10.3390/molecules16097302
Article

Antioxidant and Antimicrobial Attributes and Phenolics of Different Solvent Extracts from Leaves, Flowers and Bark of Gold Mohar [Delonix regia (Bojer ex Hook.) Raf.]

1,2, 1,* , 1, 2, 2, 2 and 3,*
1 Department of Chemistry and Biochemistry, University of Agriculture, Faisalabad 38040, Pakistan 2 Environmental Biotechnology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE), P.O.Box 577, Jhang Road, Faisalabad, Pakistan 3 Institute of Tropical Agriculture, Universiti Putra Malaysia, 43400 UPM, Serdang, Selangor Malaysia
* Authors to whom correspondence should be addressed.
Received: 29 June 2011 / Revised: 31 July 2011 / Accepted: 4 August 2011 / Published: 25 August 2011
(This article belongs to the Section Natural Products)
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Abstract

This paper describes the antioxidant and antimicrobial activities and phenolic components of different solvent (absolute methanol, absolute ethanol, absolute acetone, 80% methanol, 80% ethanol, 80% acetone and deionized water) extracts of leaves, flowers and bark of Gold Mohar [Delonix regia (Bojer ex Hook.) Raf.]. The extract yields from leaves, flowers and bark ranged from 10.19 to 36.24, 12.97 to 48.47 and 4.22 to 8.48 g/100 g dry weight (DW), respectively. Overall, 80% methanol extract produced from the leaves exhibited significantly (P < 0.05) higher antioxidant activity, with high phenolic contents (3.63 g GAE/100 g DW), total flavonoid contents (1.19 g CE/100 g DW), inhibition of peroxidation (85.54%), DPPH scavenging capacity (IC50 value 8.89 μg/mL) and reducing power (1.87). Similarly, this 80% methanol leaves extract also showed superior antimicrobial activity. HPLC analysis of the 80% methanol extracts for individual phenolics revealed the presence of gallic, protocatechuic and salicylic acid in leaves; gallic, protocatechuic, salicylic, trans-cinnamic and chlorogenic acid in flowers, and gallic acid in bark as the main (amount > 1.50 mg/100 g DW) phenolic acids. Besides, small amounts ( < 1.50 mg/100 g DW) of some other phenolic acids such as sorbic, sinapic, p-coumaric, m-coumaric, ferulic, caffeic, 3-hydroxybenzoic, 4-hydroxycinnamic and 4-hydroxybenzoic acids were also detected. The extracts of the tested parts of Gold Mohar, especially, the leaves, might be valuable for functional food and therapeutic applications.
Keywords: Delonix regia; solvent extracts; total phenolics; antioxidant activities; antimicrobial activities Delonix regia; solvent extracts; total phenolics; antioxidant activities; antimicrobial activities
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Shabir, G.; Anwar, F.; Sultana, B.; Khalid, Z.M.; Afzal, M.; Khan, Q.M.; Ashrafuzzaman, M. Antioxidant and Antimicrobial Attributes and Phenolics of Different Solvent Extracts from Leaves, Flowers and Bark of Gold Mohar [Delonix regia (Bojer ex Hook.) Raf.]. Molecules 2011, 16, 7302-7319.

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