• Food Science and Biotechnology
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• v.18 no.1
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• pp.43-47
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• 2009

Rheum undulatum and Rheum palmatum have been widely used as food material as well as medicinal ingredients for their therapeutic effects in oriental countries. Many kinds of herbs are being used in the manufacture of functional foods. The objective of this study was to determine polyphenol content, superoxide dismutase (SOD)-like activity, tyrosinase activity, and electron donating ability of R. undulatum and R. palmatum. Total polyphenol content were most effective in 50 and 100% ethanol extracts from R. undulatum and R. palmatum. SOD-like activities of R. undulatum extracts were higher than those of R. palmatum extracts, and water extracts of samples were highest. EDAs of R. undulatum extracts were higher (26.76-44.46%) than those of R. palmatum extracts, while those of both extracts were lower than 1.0 and 0.1% L-ascorbate. And these suggest that the extracts of R. undulatum and R. palmatum can be used as a material in functional food.

• The Korea Journal of Herbology
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• v.21 no.4
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• pp.171-176
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• 2006

Objectives : A morphological classification among Rheum palmatum Linne, Rheum undulatum Linne and Rumex crispus was made through microscopic observation. Methods : The slice of the tested material made by paraffin section technique was colored with Safranine Malachite Green contrast methods, and then observed and photographed by olymphus-BHT. Results: 1. Stellate spots were found on the intersection of Rheum palmatum, composed of heteromorphy vascular bundles. 2. Stellate sponts were not found in Rheum undulatum and Rumex crispus, because they do not have heteromorphy vascular bundles. Conclusion : Rheum palmatum can be distinguished with Rheum undulatum and Rumex crispus, based on the presence of Stellate spots on its intersection.

• The Journal of Korean Medicine
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• v.24 no.4
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• pp.87-91
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• 2003

Objectives: To examine the relaxational response to the water extract of Rheum palmatum L. and Rheum undulatum L. on rat thoracic aorta and abdominal aorta. Methods: Segments of thoracic aorta and abdominal aorta obtained from rats immediately after delivery were mounted in organ baths superfused on a polygraph. Results : We found that the thoracic aorta segments responded to the water extract of genus Rheum with a dose-dependent vasorelaxation. At $10^{-4}$ M 5-HT, the maximal contraction force was 93.5% of the maximum KCI-response. The 5-HT induced contractions at $10^{-4}$ M were inhibited by 86.4% and 62.1 % after addition of the high concentrations of R. palmatum root (RPR) and leaf (RPL) and R. undulatum root (RUR) and leaf (RUL). At 10 mg/ml RPR and RUR, the relaxational response at thoracic aorta and abdominal aorta with and without endothelium were 86.4%, 83.2%, 85.8%, and 62.1% of the maximum 5-HT induced contraction. Conclusion: Our result showed that RPL and RUL induced dose-dependent vasorelaxation on rat thoracic aorta and abdominal aorta, and that RPL and RUL roots have more potent effects than the leaves.

• Journal of Physiology & Pathology in Korean Medicine
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• v.16 no.5
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• pp.938-942
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• 2002

We have examined the relaxational response to the water extract of Rheum palmatum L.(ERP) and water extrc alcohol processed Rheum palmatum L.(ARP) in isolated thoracic aorta from sprague dawley (SD) rat. Rat thoracic aort investigated in vessel segments suspended for isometric tension recording by polygraph. Responses to ERP and ARP investigated in vessels precontracted with 5-hydroxytryptamine(5-HT). We found that the thoracic aorta segments respo to ERP and ARP with a dose-dependent vasorelaxation. We found that ; The thoracic aorta segments responded to I and ARP with a dose-dependent vasodilation. The 5-HT induced contraction at 10/sup -4/M were inhibited by 71.7% and a: after addition of the 0.01 g/mL water extract of ERP and ARP. The 5-HT induced contraction at 10/sup -4/M were inhibite 100% after 10/sup -3/M emodin. The concentration of emodin was 0.027% and 0.098% in ERP and ARP. In condusion, ERP ARP induced relaxation in the isolated rat thoracic aorta were composed of dose-dependent relaxation. and it has pi vasodilation.

• Natural Product Sciences
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• v.25 no.2
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• pp.111-114
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• 2019

The herbal formula, DF-02, consisting of Ephedra intermedia and Rheum palmatum are used for the treatment of the metabolic diseases such as obesity and liver fibrosis in Korean local clinics. We aimed to develop the simultaneous analytical conditions for four standards, (+)-pseudoephedrine (PSEP) and (-)-ephedrine (EP) for E. intermedia, and aloe-emodin (AE) and chrysophanol (CP) for R. palmatum using HPLC-UV techniques. The validated conditions yielded the high precision (relative standard deviation (RSD) < 3.65%) and the recoveries (94 - 106%) using the calibration curves with high linearity ($R^2$ > 0.9994). As a result, four standards of DF-02 were simultaneously determined under the developed method, which will be utilized for the quality control or evaluation of DF-02 and many herbal preparations containing E. intermedia and R. palmatum.

• YAKHAK HOEJI
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• v.46 no.6
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• pp.433-440
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• 2002

The protective efficacy of Rheum palmatum water extract on 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-induced parkinsonism was studied in C57BL/6 mice. In order to demonstrate neuroprotective effect of R. palmatum extract, animals were administered intraperitoneally with the water extract (100 or 200 mg/kg/day) for 14 days, and MPTP (10 mg/kg/day) was injected subcutaneously into the mice for the first 6 consecutive days from the beginning 1 hr before R. palmatum extract treatment. All animals were measured the several neurobiochemical markers such as dopamine level and monoamine oxidase B (MAO-B) activity in various regions of brain. The treatment of mice with R. palmatum extract was confirmed recovery effect on MAO-B activity in the cerebellum and the cerebral cortex. R. palmatum extract was attenuated the MPTP-induced depletion of substantia nigra dopamine. The contents of MDA, a marker of lipid peroxidation, in brain tissues (cerebellum and cerebral cortex mitochondria) were decreased significantly by R. palmatum extract. These results suggest that R. palmatum water extract plays an effective role in attenuating MPTP-induced neurotoxicity in mice. This protective effect of R. palmatum might be estimated the result from the inhibitory activity on monoamine oxidase B and the enhancement of antioxidant activity.

• YAKHAK HOEJI
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• v.43 no.4
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• pp.458-463
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• 1999

This study was undertaken to test for antiviral activity of the aqueous extracts prepared from 4 medicinal plants of Korea (Terminalia chebula, Sanguisorba officinalia, Rubus coreanus, Rheum palmatum). Aqueous extracts were assayed for the inhibition of hepatitis B virus (HBV) replication by measurement of HBV DNA and surface antigen (HBsAg) levels in the extracellular medium of HepG2 2.2.15 cells. All extracts decreased the levels of extracellular HBV virion DNA at concentrations ranging from 64 to $128{\;}\mu\textrm{g}/ml$ and inhibited the production of HBsAg dose-dependently. Among the 4 tested plants, Terminalia chebula exhibits the most prominent anti-HBV activities. Our findings suggest that these 4 medicinal plants may have potential to develop as specific anti-HBV drugs in the future.

• Proceedings of the Korean Society of Applied Pharmacology
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• 2002.07a
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• pp.203-203
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• 2002

Rheum palmatum L. has been used for treatment of hypertension, lipemia, and paramenia in the oriental gerbal medicines for a long time. We have examined the relaxational response to the water extract of Rheum palmaum L. in isolated thoracic aorta from sprague dawley (SD) rat in the presence and absence of endothelium. Rat thoracic aorta was investigated in vessel segments suspended for isometric tension recording by polygraph. Responses to Rhizoma Rhei were investigated in vessels precontracted with 5-hydroxytryptamine. We found that the ghoracic aorta segments responded to the water extract of Rheum palmatum L. (ERP) with a dose-dependent vasorelaxation. We found that 1.The thoracic aorta sehments responded to ERP with a dose-dependent vasodiliation. 2.The 5-HT induced contraction at 10$\^$-4/M were inhibited by 85.8% after addition of the 0.1 g/mL water extract of ERP. 3. The 5-HT induced contraction at 10$\^$-4/ M with and without endothelium were inhibited by 86.4% and 85.8% after addition of the 0.1g/mL ERP. 4. After pre-treatment of the thoracic aorta with 10$\^$-4/M N$\^$G/-monomethyl-L-arginine(L-NMMA), inducible niric oxide synthase inhibitor, the vessels has not response to the contraction. In conclusion, ERP induced reaxation in the isolated rat thoracic aorta were composed of dose-dependent relaxation. and it has potent vasodilation.

• Mycobiology
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• v.44 no.2
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• pp.93-98
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• 2016

A new leaf spot disease was observed on leaves of Rheum palmatum (Chinese rhubarb) in Northwest China (Gansu Province) starting in 2005. A Septoria-like fungus was isolated and completion of Koch's postulates confirmed that the fungus was the casual agent of the leaf spot disease. Morphology and molecular methods were combined to identify the pathogen. The fungus produced conidiomata pycnidia and the conidia were 2~5 septate, $61.2{\sim}134.1{\mu}m$ in length and $3.53{\sim}5.3{\mu}m$ in width, which is much larger than the known Spetoria species that infects Polygonaceae species. Phylogenic analysis of the internal transcribed spacer region confirmed that this Septoria-like fungus is within the Septoria genus but distinct from known Septoria species. Together, these morphological and phylogenetic data support that the R. palmatum infecting Septoria strain is a newly-described plant pathogenic species.

• KSBB Journal
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• v.32 no.2
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• pp.133-139
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• 2017

Rheum palmatum has traditionally been used as a preventive agent and medication against fever and infection. The aim of this study was to isolate and characterize an antibacterial substance from R. palmatum that is effective against bacterial vaginosis. A methanol extract from R. palmatum showed antibacterial activity against Lactobacillus vaginalis KC TC 3515, Chryseobacterium gleum KCTC 2904, and Sphingomonas paucimobilis KCTC 2834, which cause bacterial vaginosis. After extraction and pH control of the methanol extract from R. palmatum, we found that acidic and alkaline extracts did not show antibacterial activity. A neutral extract (50 mg/mL) displayed an inhibitory zone of 18 mm on a nutrient agar plate with C. gleum KCTC 2904. Fractions No. 11 and 12 among 41 fractions obtained by silica gel column chromatography produced inhibitory zones of 10 mm on nutrient agar plates with C. gleum KCTC 2904. $R_f0.15$ and $R_f0.17$ spots produced by TLC of fraction No. 11 showed antibacterial activity against C. gleum KCTC 2904. Isolation and purification of the peak at a retention time (Rt) of 9.427 min was achieved by HPLC of $R_f0.29spots$. The peak at Rt 9.427 min showed antibacterial activity against C. gleum KCTC 2904.