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Antioxidants 2016, 5(3), 31; doi:10.3390/antiox5030031

Phenolic Compounds and Antioxidant Activity of Phalaenopsis Orchid Hybrids

1
Graduate School for International Development and Cooperation, Hiroshima University, Hiroshima 739-8529, Japan
2
Department of Agricultural Botany, Faculty of Agriculture, Tanta University, Tanta 31527, Egypt
*
Author to whom correspondence should be addressed.
Academic Editor: Ehab A. Abourashed
Received: 3 July 2016 / Revised: 3 September 2016 / Accepted: 9 September 2016 / Published: 14 September 2016
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Abstract

Phalaenopsis spp. is the most commercially and economically important orchid, but their plant parts are often left unused, which has caused environmental problems. To date, reports on phytochemical analyses were most available on endangered and medicinal orchids. The present study was conducted to determine the total phenolics, total flavonoids, and antioxidant activity of ethanol extracts prepared from leaves and roots of six commercial hybrid Phalaenopsis spp. Leaf extracts of “Chian Xen Queen” contained the highest total phenolics with a value of 11.52 ± 0.43 mg gallic acid equivalent per g dry weight and the highest total flavonoids (4.98 ± 0.27 mg rutin equivalent per g dry weight). The antioxidant activity of root extracts evaluated by DPPH (2,2-diphenyl-1-picrylhydrazyl) free radical scavenging assay and β-carotene bleaching method was higher than those of the leaf extracts. Eleven phenolic compounds were identified, namely, protocatechuic acid, p-hydroxybenzoic acid, vanillic acid, caffeic acid, syringic acid, vanillin, ferulic acid, sinapic acid, p-coumaric acid, benzoic acid, and ellagic acid. Ferulic, p-coumaric and sinapic acids were concentrated largely in the roots. The results suggested that the root extracts from hybrid Phalaenopsis spp. could be a potential source of natural antioxidants. This study also helps to reduce the amount of this orchid waste in industrial production, as its roots can be exploited for pharmaceutical purposes. View Full-Text
Keywords: Phalaenopsis; phenolic compounds; antioxidant activity; moth orchids Phalaenopsis; phenolic compounds; antioxidant activity; moth orchids
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MDPI and ACS Style

Minh, T.N.; Khang, D.T.; Tuyen, P.T.; Minh, L.T.; Anh, L.H.; Quan, N.V.; Ha, P.T.T.; Quan, N.T.; Toan, N.P.; Elzaawely, A.A.; Xuan, T.D. Phenolic Compounds and Antioxidant Activity of Phalaenopsis Orchid Hybrids. Antioxidants 2016, 5, 31.

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