Abstract
This research was conducted to exploit the waste of used plant parts from the widely marketed moth orchid cultivar (Phalaenopsis Sogo Yukidian “V3”). Various extracts of roots, stems, and leaves were evaluated for total phenolics, total flavonoids, and antioxidant capacity. The bound extract from stems contained the highest total phenolics (5.092 ± 0.739 mg GAE (gallic acid equivalent)/g DW (dry weight)). The maximum total flavonoids (2.218 ± 0.021 mg RE (rutin equivalent)/g DW) were found in the hexane extract of leaves. Ethyl acetate extract from roots showed the greatest antioxidant activity compared to other extracts. Of these extracts, the IC50 values of these samples were 0.070 mg/mL, and 0.450 mg/mL in a free radical 1,-diphenyl-picryl-hydrazyl (DPPH) assay and reducing power method, respectively. The lipid peroxidation inhibition (LPI) was found to be 94.2% using the β-carotene bleaching method. Five phenolic compounds including caffeic acid, syringic acid, vanillin, ellagic acid, and cinnamic acid were quantified by high performance liquid chromatography (HPLC). It is suggested that the roots of the hybrid Phalaenopsis Sogo Yukidian “V3” cultivar may be exploited as an effective source of antioxidants.
Highlights
Phytoplankton is a rich source of phytochemicals and antioxidants
Sogo Yukidian “V3” cultivar used in this study was grown in a greenhouse at the Kurousu Orchid Company, Saitama Prefecture, Japan from April 2014 to July 2015
The samples were ground into powder using a kitchen grinder
Summary
Phytoplankton is a rich source of phytochemicals and antioxidants. A considerable number of studies have been conducted regarding new forms of antioxidants due to their known health benefits [1]. Natural antioxidants are an important source for preventing or scavenging free radicals and reducing chronic and degenerative diseases by slowing the aging process and treating cancer. Of which phenolic compounds are a key component, have diverse applications in antioxidant production. Recent replacement of synthetic antioxidants with natural compounds and the identification of new antioxidants have become very important [2]. The genus Phalaenopsis (moth orchids) comprises about 66 species belonging to the Orchidaceae family (estimated > 25,000 species) [3,4].
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