| Summary: | This data article includes data and analyses on the effect of different agronomic techniques on the production of Polygonum maritimum L. (sea knotgrass), namely different salinity irrigation treatments (0, 100, 200, 300 and 600 mM of NaCl) and a multi-harvest regime, and their relation with the chemical profile (ultra-high-resolution mass spectrometry - UHRMS), in vitro antioxidant [radical-scavenging activity (RSA) of DPPH and ABTS, copper chelating activity and ferric reducing antioxidant power] and anti-inflammatory (nitric oxide reduction on lipopolysaccharide-stimulated macrophages) activities. For further interpretation of the data presented in this work, please see the related research article “The irrigation salinity and harvesting affect the growth, chemical profile and biological activities of Polygonum maritimum L.” (Rodrigues et al., 2019). Keywords: Antioxidant activity, Anti-inflammatory activity, Halophyte domestication, Saline agriculture
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