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Abstract ▼ AI-Helper

The dried neeldes(1.5 kg) of Juniperus rigida were ground, extracted with acetone-H2O(7:3, v/v), concentrated, and fractionated with a series of hexane, CH2Cl2, EtOAc and water on a separatory funnel. Each fraction was freeze dried to give dark-brown powder and EtOAc and water soluble fractions were...

The dried neeldes(1.5 kg) of Juniperus rigida were ground, extracted with acetone-H2O(7:3, v/v), concentrated, and fractionated with a series of hexane, CH2Cl2, EtOAc and water on a separatory funnel. Each fraction was freeze dried to give dark-brown powder and EtOAc and water soluble fractions were chromatographed on a Sephadex LH-20 column using a series of aqueous methanol and ethanol-hexane mixture as eluent. Spectrometric analysis such as NMR and FAB or EI-MS including TLC were performed to characterize the structures of the isolated compounds. The needles of Juniperus rigida contained a large amount of (+)-catechin, quercetin-3-O-α-L-rhamnopyranoside and isoconiferin, in addition to a small amount of umbelliferone and quercetin-3-O-β-D-rutinoside. The antioxidative activities of each fraction and isolated compounds were tested by DPPH radical scavenging method, and EtOAc soluble fraction, (+)-catechin and quercetin-3-O-α-L-rhamnopyranoside were effective.

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