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The effectiveness of pressurized hot water extraction (PHWE) of anthraquinones from Morinda citrifolia was evaluated by determining the capability of the extracts to scavenge the free radical 1,1-diphenyl-2-picrylhydrazyl (DPPH) in vitro, as compared with the extracts obtained by other conventional extraction methods such as ethanol extraction in stirred vessel, Soxhlet extraction, and ultrasound-assisted...
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