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Kielcorin
Kielcorin
ChemFaces products have been cited in many studies from excellent and top scientific journals
Product Name Kielcorin
Price:
CAS No.: 64280-48-4
Catalog No.: CFN89359
Molecular Formula: C24H20O8
Molecular Weight: 436.41 g/mol
Purity: >=98%
Type of Compound: Xanthones
Physical Desc.: Powder
Source: The branches of Kielmeyera variabilis.
Solvent: Chloroform, Dichloromethane, Ethyl Acetate, DMSO, Acetone, etc.
Download: COA    MSDS
Similar structural: Comparison (Web)  (SDF)
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According to end customer requirements, ChemFaces provide solvent format. This solvent format of product intended use: Signaling Inhibitors, Biological activities or Pharmacological activities.
Size /Price /Stock 10 mM * 1 mL in DMSO / Inquiry
Other Packaging *Packaging according to customer requirements(100uL/well, 200uL/well and more), and Container use Storage Tube With Screw Cap
Our products had been exported to the following research institutions and universities, And still growing.
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  • Institute of Bioorganic Chemist... (Poland)
  • Center for protein Engineering ... (Belgium)
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Related Screening Libraries
Size /Price /Stock 10 mM * 100 uL in DMSO / Inquiry / In-stock
10 mM * 1 mL in DMSO / Inquiry / In-stock
Related Libraries
Biological Activity
Description: Kielcorin shows antibacterial activity against strain EMRSA-16. It also shows in vitro anti-inflammatory (respiratory burst) inhibiting activities using isolated human neutrophils (IC (50) = 965.21 ± 65.80 uM). trans-Kielcorin has hepatoprotective activity, it can prevent tert-butylhydroperoxide-induced lipid peroxidation and cell death in freshly isolated rat hepatocytes.
Targets: Immunology & Inflammation related | Antifection
In vitro:
J Nat Prod. 2016 Mar 25;79(3):470-6.
Antistaphylococcal Prenylated Acylphoroglucinol and Xanthones from Kielmeyera variabilis.[Pubmed: 26900954 ]

METHODS AND RESULTS:
Bioactivity-guided fractionation of the EtOH extract of the branches of Kielmeyera variabilis led to the isolation of a new acylphoroglucinol (1), which was active against all the MRSA strains tested herein, with pronounced activity against strain EMRSA-16. Compound 1 displayed an MIC of 0.5 mg/L as compared with an MIC of 128 mg/L for the control antibiotic norfloxacin. The structure of the new compound was elucidated by 1D and 2D NMR spectroscopic analysis and mass spectrometry, and experimental and calculated ECD were used to determine the absolute configurations. The compounds β-sitosterol (2), stigmasterol (3), ergost-5-en-3-ol (4), and osajaxanthone (5) also occurred in the n-hexane fraction.
CONCLUSIONS:
The EtOAc fraction contained nine known xanthones: 3,6-dihydroxy-1,4,8-trimethoxyxanthone (6), 3,5-dihydroxy-4-methoxyxanthone (7), 3,4-dihydroxy-6,8-dimethoxyxanthone (8), 3,4-dihydroxy-2-methoxyxanthone (9), 5-hydroxy-1,3-dimethoxyxanthone (10), 4-hydroxy-2,3-dimethoxyxanthone (11), Kielcorin (12), 3-hydroxy-2-methoxyxanthone (13), and 2-hydroxy-1-methoxyxanthone (14), which showed moderate to low activity against the tested MRSA strains.
Planta Med. 2011 Dec;77(18):2013-8.
Anti-inflammatory xanthones from the twigs of Hypericum oblongifolium wall.[Pubmed: 21870324 ]

METHODS AND RESULTS:
Two new xanthonolignoids, hypericorin A (1) and hypericorin B (2), along with five known new source compounds, a xanthonolignoid, Kielcorin (3), 4-hydroxy-2,3-dimethoxyxanthone (4), 3,4,5-trihydroxyxanthone (5), 1,3-dihydroxy-5-methoxyxanthone ( 6) and 1,3,7-trihydroxyxanthone (7), were isolated from the stems (twigs) of Hypericum oblongifolium Wall. The structures of the new compounds were deduced on the basis of spectroscopic techniques (EI-MS, HREI-MS, (1)H NMR, (13)C NMR, HMQC, HMBC, and NOESY). We also report herein for the first time the single crystal X-ray structure of compound 6.
CONCLUSIONS:
Compounds 1- 7 were screened for their IN VITRO anti-inflammatory (respiratory burst) inhibiting activities using isolated human neutrophils; compounds 1, 2, 3, 5, and 7 showed significant activities (IC (50) = 816.23 ± 73.30, 985.20 ± 55.80, 965.21 ± 65.80, 907.20 ± 50.80, 975.20 ± 81.10 μM, respectively), compound 6 showed moderate activity (IC (50) = 2500.85 ± 50.50 μM), while compound 4 was totally inactive at 1000 μg/mL as compared to the positive control used, indomethacin (IC (50) = 757.99 ± 5.90 μM), and aspirin (IC (50) = 279.44 ± 4.40 μM). Compound 4 was also inactive in comparison with other tested Hypericum compounds.
Kielcorin Description
Source: The branches of Kielmeyera variabilis.
Solvent: Chloroform, Dichloromethane, Ethyl Acetate, DMSO, Acetone, etc.
Storage: Providing storage is as stated on the product vial and the vial is kept tightly sealed, the product can be stored for up to 24 months(2-8C).

Wherever possible, you should prepare and use solutions on the same day. However, if you need to make up stock solutions in advance, we recommend that you store the solution as aliquots in tightly sealed vials at -20C. Generally, these will be useable for up to two weeks. Before use, and prior to opening the vial we recommend that you allow your product to equilibrate to room temperature for at least 1 hour.

Need more advice on solubility, usage and handling? Please email to: service@chemfaces.com

After receiving: The packaging of the product may have turned upside down during transportation, resulting in the natural compounds adhering to the neck or cap of the vial. take the vial out of its packaging and gently shake to let the compounds fall to the bottom of the vial. for liquid products, centrifuge at 200-500 RPM to gather the liquid at the bottom of the vial. try to avoid loss or contamination during handling.
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Recently, ChemFaces products have been cited in many studies from excellent and top scientific journals

Cell. 2018 Jan 11;172(1-2):249-261.e12.
doi: 10.1016/j.cell.2017.12.019.
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Calculate Dilution Ratios(Only for Reference)
1 mg 5 mg 10 mg 20 mg 25 mg
1 mM 2.2914 mL 11.4571 mL 22.9142 mL 45.8285 mL 57.2856 mL
5 mM 0.4583 mL 2.2914 mL 4.5828 mL 9.1657 mL 11.4571 mL
10 mM 0.2291 mL 1.1457 mL 2.2914 mL 4.5828 mL 5.7286 mL
50 mM 0.0458 mL 0.2291 mL 0.4583 mL 0.9166 mL 1.1457 mL
100 mM 0.0229 mL 0.1146 mL 0.2291 mL 0.4583 mL 0.5729 mL
* Note: If you are in the process of experiment, it's need to make the dilution ratios of the samples. The dilution data of the sheet for your reference. Normally, it's can get a better solubility within lower of Concentrations.
Protocol
Cell Research:
Pharm Res. 1995 Nov;12(11):1756-60.
Hepatoprotective activity of xanthones and xanthonolignoids against tert-butylhydroperoxide-induced toxicity in isolated rat hepatocytes--comparison with silybin.[Pubmed: 8592682]
Synthesize and evaluate the protective activity against tertbutylhydroperoxide-induced toxicity in freshly isolated rat hepatocytes of trans-Kielcorin, trans-isoKielcorin B, as well as their respective building blocks 3,4-dihydroxy-2-methoxyxanthone and 2,3-dihydroxy-4-methoxyxanthone.
METHODS AND RESULTS:
Wistar rats, weighing 200-250g were used. Hepatocyte isolation was performed by collagenase perfusion. Incubations were performed at 37 degrees C, using 1 million cells per milliliter in modified Krebs--Henseleit buffer. The protective activity was evaluated by measuring reduced and oxidized glutathione, lipid peroxidation and cell viability after inducing toxicity with tert-butylhydroperoxide (1.0 mM, 30 min), with or without the studied compounds in the concentrations of 0.025, 0.050, 0.100 and 0.200 mM. Silybin was tested in the same experimental conditions to serve as a positive control. Using these concentrations, the tested compounds prevented tert-butylhydroperoxide-induced lipid peroxidation and cell death in freshly isolated rat hepatocytes. All compounds were also effective in preventing perturbation of cell glutathione homeostasis in some extent. 3,4-Dihydroxy-2-methoxyxanthone and 2,3-dihydroxy-4-methoxyxanthone were more effective than trans-Kielcorin and trans-isoKielcorin B respectively. Silybin was less effective in protecting cells against lipid peroxidation and loss of cell viability than the four xanthonic derivatives.
CONCLUSIONS:
The tested compounds protected the freshly isolated rat hepatocytes against tert-butylhydroperoxide-induced toxicity.
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