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Consecutive Recovery of Bioactive Substances from Desmodium canadense at Different Plant Vegetation Phases by Green Extraction with Supercritical CO 2 and Increasing Polarity Pressurized Liquids
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Consecutive Recovery of Bioactive Substances from Desmodium canadense at Different Plant Vegetation Phases by Green Extraction with Supercritical CO 2 and Increasing Polarity Pressurized Liquids
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Journal Article
Consecutive Recovery of Bioactive Substances from Desmodium canadense at Different Plant Vegetation Phases by Green Extraction with Supercritical CO 2 and Increasing Polarity Pressurized Liquids
2026
Overview
This study used high-pressure extraction to obtain antioxidant-rich fractions from
leaves harvested at five vegetation phases (intensive growing to end of blooming) and to evaluate their antioxidant activity and phytochemical profile. Supercritical CO
extraction recovered lipophilic compounds, with the highest yield at massive flowering. The remaining plant material was fractionated by pressurized liquid extraction (PLE) using acetone, ethanol, and water; the highest PLE yield was achieved with water (16.54 g/100 g DW) at the bud formation stage. Antioxidant capacity was measured using total phenolic content (TPC) and ABTS
, CUPRAC, and ORAC assays. Overall, ethanol PLE extracts showed the strongest antioxidant properties: maximum TPC (282.1 mg GAE/gE) and ABTS
(1010 mg TE/gE) at massive flowering, and highest CUPRAC (853.3 mg TE/gE) and ORAC (1882 mg TE/gE) at bud formation. UPLC-Q-TOF-MS/MS profiling identified 37 compounds, mainly C-glycosyl flavones, flavonol O-glycosides, hydroxycinnamic acid derivatives, and low molecular weight organic acids. Water extracts were rich in low molecular weight organic acids, while acetone and ethanol extracts contained the highest flavonoid levels. Citric acid and vitexin were the most abundant compounds. The findings indicate that
leaves, especially harvested at budding through massive flowering, are a promising source of flavonoid-rich antioxidant extracts for nutraceutical and functional food applications.
