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HPLC Analysis of ARP water extracts. ARP extract was dissolved in distilled water and filtered through a 0.45 μm syringe filter. As standard, methanol-dissolved 4-hydroxybenzoic acid and (+)-catechin (99% purity) were used. A sample volume of 20 μl was injected and analyzed at a flow rate of 0.7 ml/min using an ultraviolet detector at (A) 254 nm for 4-hydroxybenzoic acid and (B) 280 nm for (+)-catechin.
