• Journal of Korean Society of Forest Science
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• v.103 no.1
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• pp.113-121
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• 2014

From the bark of Euonymus japonica, ten compounds were isolated by column chromatography and identified as follows. The structures were determined as : (-)-epicatechin, (-)-epigallocatechin, vanillic acid, 2,4-dimethoxyphenol-1-glucoside, 2, 4, 6-trimethoxyphenol-glucoside, 5-caffeoylquinic acid, 4-caffeoyuinic acid, 3, 4-dicaffeoylquinic acid, 3, 5-dicaffeoylquinic acid, and 1, 5-dicaffeoylquinic acid.

• Applied Biological Chemistry
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• v.39 no.6
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• pp.506-511
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• 1996

Six phenolic acids were isolated from Jindalrae flowers (Rhododendron mucronulatum Turcz.), an edible plant in Korea. These compounds were identified as chlorogenic acid, 3,5-O-dicaffeoylquinic acid, 4,5-O-dicaffeoylquinic acid, caffeic acid, ferulic acid, and p-coumaric acid on the basis of IR, UV, $^{1}H$ and $^{13}C$ NMR, FAB-MS, ES-MS and/or El-MS data. Chlorogenic acid (0.2 g) present in both ethyl acetate and ethyl ether fractions comprised up to 38.5% of the total phenolic acid amount (0.52 g) finally recovered by means of polyamide C-200 column chromatography, preparative TLC, recrystallization, and Sephadex LH-20 column chromatography The antioxidant activities were measured in an ethanol solution of linoleic acid in the presence of ferric thiocyanate. The antioxidant efficiency increased in the order of p-coumaric acid<${\alpha}-tocopherol$

• Korean Journal of Pharmacognosy
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• v.52 no.2
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• pp.112-117
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• 2021

Helianthus annuus L. has been reported with various pharmacological activities such as antibacterial, antidiabetic, and antioxidant effects. According to recent studies, H. annuus L. is known to contain components such as phenolic compounds, flavonoids, alkaloids, sesquiterpenoids, and lignans. The seeds of H. annuus L. have been reported to contain chlorogenic acid and di-O-caffeoylquinic acid as major components. However, studies on the main components and content of leaves of H. annuus L. are still incomplete. Therefore, in this study, the contents of four major components of H. annuus L. were evaluated by simultaneous quantitative analysis with high performance liquid chromatography (HPLC)-diode array detector (DAD). The isolated four compounds Caffeoylquinic acid(CQA), 3,4-dicaffeoylquinic acid(3,4-DCQA), 3,5-dicaffeoylquinic acid(3,5-DCQA) and 4,5-dicaffeoylquinic acid(4,5-DCQA) were shown in a large linearity with a correlation coefficient (R²) of 0.99. In addition, as a result of intra-inter day analysis of four major compounds by the analysis method of this study, the accuracy of 88.46% or more and less than 112.85% and excellent precision of less than 3% were shown, the content analysis showed CQA (0.383±0.018 mg/g), 3,4-DCQA (0.282±0.017 mg/g), 3,5-DCQA (1.109±0.068 mg/g), and 4,5-DCQA (0.673±0.020 mg/g).

• Korean Journal of Pharmacognosy
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• v.48 no.1
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• pp.70-76
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• 2017

Dendranthema spp are distributed in various regions in Korea. This report is the quantitative results of phenolic compounds on the 5 resources collected from all over the country. It was known that it has phenolic compounds, as an anticoagulant activities and immunoadjuvant activity of contribute to the cardiovascular effects. This was used for quantitative analysis of chlorogenic acid(CA), 3,5-Dicaffeoylquinic acid(3,5-DCA), 4,5-Dicaffeoylquinic acid(4,5-DCA) and linarin, with UPLC-PDA and LC-IT-TOF-MS. Extraction efficiency of compounds was compared by using ultrasonic extraction and reflux extraction with different extraction conditions (methods and time). In 50% MeOH extracs (30 mins) of Dendranthema zawadskii (Herb.) Tzvelev (SDZ), Dendranthema zawadskii var. yezoense (Maek.) Y.M.Lee & H.J.Choi (NDZ), Dendranthema zawadskii (Herb.) Tzvelev var. teuisectum (Kitag.) J. H. Pak (GDZ), Dendranthema careanum (H. $L{\acute{e}}v$. & Vaniot) Vorosch. (HDC) and Dendranthema zawadskii var. tenuisectum Kitag (PDZ), chlorogenic acid contents were 1.14‰, 6.95‰, 7.27‰, 1.47‰ and 2.64‰, 3,5-dicaffeoylquinic acid contents were 3.30‰, 5.60‰, 10.81‰, 2.67‰ and 1.50‰, 4,5-dicaffeoylquinic acid contents were 0.74‰, 1.93‰, 3.36‰, 0.61‰ and 0.43‰ and linarin contents were 3.90‰, 10.15‰, 0.15‰, 0.73‰ and 0.21‰, respectively.

• Biomolecules & Therapeutics
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• v.15 no.1
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• pp.46-51
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• 2007

Bioassay-directed chromatographic fractionation of an ethyl acetate extract from leaves of sweet potato (Ipomoea batatas L.) afforded six quinic acid derivatives: 3,5-epi-dicaffeoylquinic acid (1), 3,5-dicaffeoylquinic acid (2), methyl 3,5-O-dicaffeoylquinate (3), methyl 3,4-dicaffeoylquinate (4), methyl 4,5-dicaffeoylquinic acid (5),4,5-dicaffeoylquinate (6), and two phenolic compounds: caffeic acid (7) and caffeic acid methyl ester (8) together with three flavonoids: quercetin 3-O-${\beta}$-D-glucopyranoside (9), quercetin 3-O-${\beta}$-D-glucopyranoside, isoquercitrin (10) and kaempferol 3-O-${\beta}$-D-glucopyranoside (11). The structures of these compounds were elucidated by the aid of spectroscopic methods. These compounds were assessed for antioxidant activities using three different cell-free bioassay systems. All isolates except 11 showed potent DPPH and superoxide anion radicals scavenging, and lipid peroxidation inhibitory activities. 3,5-epi-DCQA (1) and methyl quinates (3-5) along with flavonoide 9 were isolated for the first time from this plant.

• Natural Product Sciences
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• v.24 no.2
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• pp.109-114
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• 2018

Artemisia capillaris Thunb. (Compositae) is a native herb of East Asian countries and has used for the treatment of jaundice, high liver fever, and digestive diseases for a long time, as well as being developed as the source of herbal preparations until now. The major components from A. capillaris were chlorogenic acid (1) and its derivatives substituted with caffeoyl moieties, such as 3,5-dicaffeoylquinic acid (2) and 4,5-dicaffeoylquinic acid (3), and coumarins, such as scoparone. In the study, four compounds, chlorogenic acid, 3,5-dicaffeoylquinic acid, 4,5-dicaffeoylquinic acid and scoparone (4) in the 70% ethanolic extract of A. capillaris were simultaneously determined by using HPLC-UVD system. This method was validated with the terms of linearity, precious and accuracy according to ICH guidelines. The developed method was successfully applied for the quantitative analysis of Artemisia genus, A. capillaris, A. iwayomogi, A. princeps, and A. argyi, distributed in Korea.

• Applied Chemistry for Engineering
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• v.26 no.4
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• pp.470-476
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• 2015

In this study, three dicaffeoylquinic acids (DCQAs) isolated from Gnaphalium affine D. DON. extracts were structurally identified and evaluated for their antioxidant activities, cellular protective effects, and tyrosinase inhibitory activities. The ethyl acetate fraction of G. affine was chromatographed, which yielded 3 DCQA derivatives of 1-3 : 3,5-dicaffoylquinic acid (3,5-DCQA, 1), 4,5-dicaffeoylquinic acid (4,5-DCQA, 2), 1,5-dicaffoylquinic acid (1,5-DCQA, 3). The structure of each compounds was determined using $^1H$ NMR and MS analyses. Compounds of 1-3 showed strong free radical (1,1-diphenyl-2-picrylhydrazyl, DPPH) scavenging activities ($FSC_{50}=3.70$, 5.80, and $5.50{\mu}M$, respectively) compared to those of a commonly used lipophilic antioxidant, (+)-${\alpha}$-tocopherol ($21.90{\mu}M$). Cellular protective effects of 1-3 compounds on the $^1O_2$ sensitized photohemolysis of human erythrocytes were similar to (+)-${\alpha}$-tocopherol. 1-3 compounds also exhibited higher tyrosinase inhibitory effects ($IC_{50}=0.15$, 0.16, and 0.13 mM) compared to arbutin (0.33 mM), known as a skin-whitening agent. These results indicate that three DCQA derivatives may be applied as an antioxidant and a skin whitening agent in food or cosmetic industries.

• Natural Product Sciences
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• v.14 no.1
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• pp.62-67
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• 2008

The leaf extract of Ligularia stenocephala showed the highest anti-platelet aggregating activity in large numbers of edible and herbal plants. The active fraction fractionationed from L. stenocephala extract by using preparative HPLC inhibited the platelet aggregation up to above 80% and its blood coagulating time (PT and APTT) also showed similar effect to aspirin (0.2 ${\mu}g/mL$), known as an anti-thrombus compound. Two antithrombus active compounds were purified and identified as 3,5-dicaffeoylquinic acid and 3,4-dicaffeoylquinic acid, respectively, on the basis of NMR and FAB-MS spectroscopic data. Two active compounds has not only antiplatelet aggregating activity, but also has anticoagulating activity.

• Korean Journal of Pharmacognosy
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• v.25 no.1
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• pp.70-72
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• 1994

From the herb of Artemisia princeps var. orientalis o-coumaric acid and 4,5-O-dicaffeoylquinic acid were isolated and identified by chemical and spectral analysis.

• Korean Journal of Plant Resources
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• v.32 no.4
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• pp.270-274
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• 2019

Anti-acetylcholinesterase (anti-AChE) activity and peroxynitrite scavenging activity of Ainsliaea acerifolia (Compositae) were studied to find its anti-Alzheimer's activity. The $IC_{50}$ was $73.4{\mu}g/mL$ in AChE assay and $8.60{\mu}g/mL$ in peroxynitrite assay. Caffeoylquinic acids that have been reported to have anti-Alzheimer's activity were analyzed in the leaf- and stem extract by HPLC. Caffeoylquinic acids occupied 25.1% of the leaf extract which was higher than 8.1% of the stem extract. Particularly, the content of 3,5-dicaffeoylquinic acid (145.6 mg/g) was highest of the tested caffeoylquinic acids. In addition, the $IC_{50}$ values of 3,5-dicaffeoylquinic acid were shown to be $3.79{\mu}g/mL$ in peroxynitrite assay and $69.19{\mu}g/mL$ in anti-AChE assay.