Phenolic Compounds and Antioxidant Activity of Phalaenopsis Orchid Hybrids

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.

Efficacy from Different Extractions for Chemical Profile and Biological Activities of Rice Husk

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Folklore Medicinal Orchids From South India: The Potential Source of Antioxidants

“…The phytochemical estimation reveals the presence of bioactive compounds such as alkaloids, flavonoids, tannins, phenols, terpenoids, and steroids. Based on the recent literature, the presence of bioactive compounds has been reported in few of the different parts of the orchid's species, namely, Coelogyne stricta [27], Dendrobium pandurantum [28], Vanda tessellata [29], Rhynchostylis retusa [30], C. aloifolium [31], Phalaenopsis [32], Luisia zeylanica [33], and Geodorum densiflorum [34]. Thus, the orchid plants have an abundant source of phytochemicals having important properties such as antioxidant activity.…”

Evaluation of Antioxidant Properties, Trace Element and Mineral Composition of Dactylorhiza umbrosa (Kar. & Kir.) Nevski (Orchidaceae)

“…Nevski were ordered 12.44 ± 0.20 (mM ascorbic acid g -1 ); 4.97 ± 0.48 (mg gallic acid g -1 ); 4.51 ± 0.29 (mg quarcetin g -1 ) respectively. Minh et al, (2016) investigated total phenolic and flavonoid contents and total antioxidant activity of Phalaenopsis orchid hybrids in their studies. The ethanol extracts of the leaves and roots of the hybrid Chien Xen Queen have the highest amount of total phenol with 11.52 ± 0.43 mg gallic acid aquavalent per g dry weight and the highest total flavonoid with 4.98 ± 0.27 mg rutin aquivalent per g dry weight.…”