• Preventive Nutrition and Food Science
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• v.15 no.1
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• pp.36-43
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• 2010

The purpose of this study was to investigate the phenolic acid, proanthocyanidin (PAs), and flavonol glycoside contents, as well as the antioxidant activities of pine needle extracts from six species of young pine trees. The extracts were prepared from Section Pinus (Diploxylon): P. densiflora, P. sylvestris, P. pinaster and P. pinea, and Section Strobus (Haploxylon): P. koraiensis and P. strobus. Phenolics were extracted from pine needles with 80% acetone to obtain the soluble free fraction, and insoluble residues were digested with 4 M NaOH to obtain bound ethyl acetate and bound water fractions. Phenolics were analyzed by HPLC, and the hydrophilic antioxidant activity was measured using oxygen radical absorbance capacity (ORAC). Total phenolic and flavonoid contents of the soluble free fraction were higher than those of the bound ethyl acetate and bound water fractions. The main phenolics were monomers and polymers of PAs in the soluble free fraction, and phenolic acids and flavonol glycosides in bound ethyl acetate fraction. Flavonol glycosides found in different species of pine needles were qualitatively similar within fractions, but composition varied among Pinus sections. High levels of kaempferol arabinoside and an unknown compound were present in all Strobus species. The soluble free fraction had the highest antioxidant activity, followed by bound ethyl acetate and bound water fractions.

• Korean Journal of Pharmacognosy
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• v.21 no.2
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• pp.148-152
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• 1990

Seven flavonol glycosides from the EtOAc fraction of Ginkgo biloba leaves were identified by high performance liquid chromatography. Separation by reversed phase chromatography on $Lichrosorb^{\circledR}$ RP-18 column was achieved by isocratic elution. The content of the major acylated flavonol glycoside, kaempferol 3-0-[$6'-O-{p}-coumaroyl-{\beta}-_D-glucosyl(1{\rightarrow}2)-{\alpha}-_L-rhamnoside$] was about 8.0% and 0.55% for EtOAc fraction and MeOH extract, respectively.

• Proceedings of the PSK Conference
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• 2003.10b
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• pp.191.2-191.1
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• 2003

Phyllanthus ussuriensis Rupr. et Maxim. (Euphorbiaceae) has long been used in folk medicine to treat kidney and urinary bladder disturbances, intestinal infections, diabetes, and hepatitis. Reported chemical constituents of this species are one flavonoid (rutin), two gallotannins (gallic acid, methyl gallate) and two ellagitannins.An investigation of the n-BuOH fraction of P. ussuriensis led to the isolation of two new megastigmane glycosides, 10-hydroxy-4,7-megastigmadiene-3-one-9-O-b-D-glucopyranoside (1), 10- hydroxy-4,6-megastigmadiene-3-one-9-O-b-D-glucopyranoside (2) and two known compounds roseoside (3) and 3-oxo-a-ionol-9-O-b-D-glucopyranoside (4). (omitted)

• Bulletin of the Korean Chemical Society
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• v.31 no.2
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• pp.461-463
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• 2010

• Korean Journal of Pharmacognosy
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• v.29 no.4
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• pp.357-359
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• 1998

From the n-butanol fraction of the water extract of the seeds of Phaseolus radiatus, two flavonoid C-glycosides were isolated and identified as iso-vitexin (1) and vitexin (2) by spectroscopic methods.

• Korean Journal of Pharmacognosy
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• v.29 no.2
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• pp.75-78
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• 1998

In the course of phytochemical studies for the aerial parts of Ajuga multiflora, one flavonoid and two iridoid glycosides were isolated and identified as apigenin (1), 8-O-acetylharpagide (2) and harpagide (3) on the basis of spectroscopic evidence.

• YAKHAK HOEJI
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• v.43 no.5
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• pp.547-552
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• 1999

Phytochemical examination of the leaves of Alnus hirsuta, one of the indigenous species grows in Korea, has led to the isolation of one flavan 3-ol and two flavonol glycosides. Structures of these compounds are identified as (-)-epicatechin (1), quercetin $3-O-{\beta}-D-galactopyranoside$ (2), quercetin $3-O-{\beta}-D-galactopyranoside$ (3) by means of physico-chemical and spectral evidences.

• Proceedings of the PSK Conference
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• 2003.10b
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• pp.137.3-138
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• 2003

The major active components of EGb 761, extract of Ginkgo biloba leaves, include flavonoid glycosides and unique diterpenes known as ginkgolides. Ginkgolides are potent inhibitors of platelet activating factor. In this study, we investigated antiinflammatory activity of ginkgolides on the Complete Freund"s Adjuvant (CFA)-induced mice. The ginkgolides were extracted from commercially available EGb 761. This extracting procedure was done by sequential treatments of the EGb 761 with chloroform, methanol, and water. (omitted)tted)

• Proceedings of the PSK Conference
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• 2002.04a
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• pp.194.2-194.2
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• 2002

• Archives of Pharmacal Research
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• v.11 no.3
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• pp.197-202
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• 1988

A new saponin, 3-O-[${\alpha}$-L-rhamnopyranosyl$(1{\rightarrow}2)$-${\beta}$-D-glucopyranosyl$(1{\rightarrow}2)$-${\beta}$-D-glucuronopyranosyl]soyasapogenol B carboxylate (6) has been isolated from the medicinal plant yellow sweetclover together with azukisaponin II(7), robinin(8), and clovin(9). 7,8, and 9 are reported for the first time from this plant. The new saponin(6) exhibited inhibitory action on leucocyte migration in inflammation.