The phenolic composition of aerial parts from Petiveria alliaceae L., Phyllanthus niruri L.\nand Senna reticulata Willd., species commonly used in Costa Rica as traditional medicines, was\nstudied using UPLC-ESI-TQ-MS on enriched-phenolic extracts. Comparatively, higher values of total\nphenolic content (TPC), as measured by the Folin-Ciocalteau method, were observed for P. niruri\nextracts (328.8 gallic acid equivalents/g) than for S. reticulata (79.30 gallic acid equivalents/g) whereas\nP. alliaceae extract showed the lowest value (13.45 gallic acid equivalents/g). A total of 20 phenolic\nacids and proanthocyanidins were identified in the extracts, including hydroxybenzoic acids (benzoic,\n4-hydroxybenzoic, gallic, prochatechuic, salicylic, syringic and vanillic acids); hydroxycinnamic acids\n(caffeic, ferulic, and p-coumaric acids); and flavan-3-ols monomers [(+)-catechin and (
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