The composition and concentration of compounds in medicinal plants vary based on several factors, including the specific part of the plant being used. These variations in composition and concentration lead to differences in biological activity levels. In this study, we aimed to assess the phytochemical profile of Sonchus arvensis and to investigate the biological activity of different plant parts (roots, stems, and leaves) using a metabolomics approach. We analyzed the plant extracts for total phenolic and flavonoid levels, antioxidant activity, and xanthine oxidase inhibition. We also conducted metabolite profiling using Fourier-transform infrared spectroscopy and liquid chromatography-high resolution mass spectrometry. A total of 17 metabolites were identified (13 in leaves, 10 in stems, and 9 in roots). Principal component analysis effectively differentiated S. arvensis extracts based on differences in plant parts. These findings indicate that the quantity and diversity of metabolites present in the roots, stems, and leaves influence the biological activity of S. arvensis.
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