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Potential Use of Plant Waste from the Moth Orchid (<em>Phalaenopsis</em> Sogo Yukidian “V3”) as an Antioxidant Source

Minh, Truong Ngoc, Tuyen, Phung Thi, Khang, Do Tan, Quan, Nguyen Van, Ha, Pham Thi Thu, Quan, Nguyen Thanh, Andriana, Yusuf, Fan, Xinyan, Van, Truong Mai, Khanh, Tran Dang, Xuan, Tran Dang
Foods 2017 v.6 no.10
2,2-diphenyl-1-picrylhydrazyl, Phalaenopsis, antioxidant activity, antioxidants, beta-carotene, bleaching, caffeic acid, cinnamic acid, cultivars, ellagic acid, ethyl acetate, free radicals, gallic acid, hexane, high performance liquid chromatography, hybrids, leaves, lipid peroxidation, roots, rutin, stems, syringic acid, vanillin, wastes
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 IC<inf>50</inf> 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.