Antioxidant Activities of the Methanol Extracts of Various Parts of Phalaenopsis Orchids with White, Yellow, and Purple Flowers

Abstract

Phalaenopsis (Phal.) orchids including white, yellow, and purple flowers are some of the most important commercial orchids worldwide. These flowering plants can be considered to be promising sources of antioxidants since several medicinal orchids were shown to have potential antioxidant activities. The antioxidant activities and several secondary metabolite compounds of the methanolic extracts of four parts (the root, pedicel, leaf, and flower) of three hybrids of white (Phal. ‘City More’), yellow (Phal. ‘Sogo Meili’), and purple (Phal. ‘Queen Beer’) flowering orchids were investigated. Results showed that the highest levels of chlorophyll a and chlorophyll b were respectively obtained in leaf extracts of white and purple orchids, whereas carotenoid showed the highest content in the flower extract of the yellow orchid. Among all tested extracts, flavonoids and anthocyanin demonstrated the highest levels in the flower extract of the purple orchid, whereas the highest level of polyphenols was observed in the flower extract of the yellow orchid. The leaf extract of the white orchid was the most effective extract with a 50% inhibitory concentration in the DPPH-scavenging activity assay, while the highest ferrous iron-chelating effect was observed in flower extracts of the yellow orchid and purple orchid, and the pedicel extract of the purple orchid. In the reducing power assay, the flower extract of the white orchid showed the most potent extract, followed by the leaf extract of the yellow orchid and the flower extract of the purple orchid. Relationships between flower colors and antioxidant activities of these orchids showed them to be potential sources of antioxidants for both medicinal use and stress-tolerance in these orchids.

Evaluation of the Use of Different Solvents for Phytochemical Constituents, Antioxidants, and In Vitro Anti-Inflammatory Activities of Severinia buxifolia

“…Oxidative stress and autoxidation of human lipids and lipoproteins result in the formation of potentially toxic compounds, causing various human health problems such as aging, cardiovascular disease, diabetes, and cancer [1,2]. To solve these problems, synthetic antioxidants, such as propyl gallate, butylated hydroxyanisole, tert-butylhydroquinone, and butylated hydroxytoluene, have been extensively used to avoid the oxidative stress and autoxidation process [3].…”

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

“…Most of its members are traded worldwide. Many medicinal orchid species contain many phytochemicals such as phenol, flavonoids, alkaloids and stereoids (Nguyen et al, 2018). The aim of this study is contribute to the search for uses of this plant as a natural antioxidant and for medicinal purposes.…”

“…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. Nguyen et al, (2018) studied white, yellow and purple flowering species of Phalaenopsis (Phal.) Orchids and found that the purple orchid flavonoid content was the highest with amount 188.70 ± 3.03 mg QE g -1 DW.…”

Polyphenol Characterization and Skin-Preserving Properties of Hydroalcoholic Flower Extract from Himantoglossum robertianum (Orchidaceae)

“…Extracts from various portions of three hybrids of Phalaenopsis species, bearing white, yellow, and purple pigmentation, have been tested for their antioxidant power. This study has revealed that in each species, flower and leaf extracts have higher antioxidant activities than pedicel and root extracts, due to higher levels of flavonoids and anthocyanins, especially in the purple species [8]. It has also been demonstrated that the Ayurvedic formulation Asthvarga, containing orchids as main component, has strong antioxidant capability, preventing DNA damage from oxidative stress [9].…”