The effect of solvent type and extraction method was investigated to study the antioxidant and antibacterial activity of Polygonum\nminus. Two extraction methods were used: a solvent extraction using Soxhlet apparatus and supercritical fluid extraction (SFE).\nThe antioxidant capacity was evaluated using the ferric reducing/antioxidant power (FRAP) assay and the free radical-scavenging\ncapacity of 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay.The highest polyphenol content was obtained from the medium polarity\nmethanol extract of the leaf portion (645.60 �± 166.68 gallic acid equivalents/100 g (GAEs/100 g)). It also showed the highest\nantioxidant power for FRAP and DPPH radical inhibition and exhibited the largest inhibition zone in antibacterial activity on\nBacillus subtilis (Gram+), Staphylococcus aureus (Gram+), and Escherichia coli (Gram?). The phase behavior and aldehyde profiles\nwere further investigated using SFE with different cosolvents. The results indicated that a 50% ethanol-water cosolvent yielded the\nbest aldehyde profiles in the presence of decanal, undecanal, and dodecanal.
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