Abstract
The seriated extracts of petroleum ether (PE-E), dichloromethane (DCM-E) and methanol extracts (MeOH-E) from the aerial parts of the native South American plant Tetraglochin ameghinoi (Rosaceae), were evaluated regarding their antioxidant and antibacterial activities. The antioxidant properties were evaluated by free radical scavenging methods (DPPH and TEAC), ferric-reducing antioxidant power (FRAP) and lipoperoxidation in erythrocytes (LP), while the antibacterial activity was performed against Gram-positive and Gram-negative bacteria according to the Clinical and Laboratory Standards Institute (CLSI) guidelines. The chemical and biological analyses of this plant are very important since this bush is currently used in traditional medicine as a cholagogue and digestive. The polar MeOH-E showed the highest antioxidant activities (17.70 µg/mL in the DPPH assay, 381.43 ± 22.38 mM TE/g extract in the FRAP assay, 387.76 ± 91.93 mg TE/g extract in the TEAC assay and 93.23 + 6.77% in the LP assay) and it was selected for chromatographic isolation of its components. These components were found to be four acetophenones, including the new phloracetophenone glucoside: 4′,6′,-dihydroxy-2′-O-(6″-acetyl)-β-d-glucopyranosylacetophenone or IUPAC name: (6-(2-acetyl-3,5-dihydroxyphenoxy)-3,4,5-trihydroxytetrahydro-2H-pyran-2-yl)methyl acetate, whose structure was elucidated by NMR and MS methods. In addition, twenty-six compounds, including five of these acetophenone derivatives, two sugars, six flavonoids, eleven phenolic acids and two triterpenes, were identified based on UHPLC-OT-MS and PDA analysis on the MeOH-E. The results support the medicinal use of the plant.
Highlights
The numerous medicinal plants growing in the Andes of Argentina are collected annually by the inhabitants of these regions and are sold in popular local markets for their therapeutic properties.a significant percentage of these species belonging to the genera Azorella, Baccharis, Tetraglochin and Senecio are used in local traditional medicine, which mostly aims to treat digestive and hepatic disorders, fevers, coughs and colds.The Tetraglochin genus, which belongs to the Rosaceae family, are distributed along the Andes from Peru to southern Argentina, including central Chile
The MeOH extract (Table 1) showed a high content of phenolic compounds (107 mg gallic acid equivalents (GAE)/g extract) and among them, 20% corresponded to flavonoids (19 mg quercetin equivalents (QE)/g extract)
EtOAc-E, it is important to note the amount of phenolics (45 mg GAE/g extract) and the lack of any detected flavonoids
Summary
The numerous medicinal plants growing in the Andes of Argentina are collected annually by the inhabitants of these regions and are sold in popular local markets for their therapeutic properties.a significant percentage of these species belonging to the genera Azorella, Baccharis, Tetraglochin and Senecio are used in local traditional medicine, which mostly aims to treat digestive and hepatic disorders, fevers, coughs and colds.The Tetraglochin genus, which belongs to the Rosaceae family, are distributed along the Andes from Peru to southern Argentina, including central Chile. The numerous medicinal plants growing in the Andes of Argentina are collected annually by the inhabitants of these regions and are sold in popular local markets for their therapeutic properties. A significant percentage of these species belonging to the genera Azorella, Baccharis, Tetraglochin and Senecio are used in local traditional medicine, which mostly aims to treat digestive and hepatic disorders, fevers, coughs and colds. The Tetraglochin genus, which belongs to the Rosaceae family, are distributed along the Andes from Peru to southern Argentina, including central Chile. This genus comprises of the following eight species: Tetraglochin acanthocarpum (Speg.) Speg.; T. alatum T. ameghinoi (Speg.) Speg.; T. caespitosum Phil.; T. cristatum (Britton) Rothm.; T. inerme
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