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    3-O-Methylquercetin tetraacetate
    3-O-Methylquercetin tetraacetate
    CAS No. 1486-69-7 Price
    Catalog No.CFN99615Purity>=98%
    Molecular Weight484.4 Type of CompoundFlavonoids
    FormulaC24H20O11Physical DescriptionYellow powder
    Download Manual    COA    MSDSSimilar structuralComparison (Web)
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    Biological Activity
    Description: 1. Quercetin 3-O-methyl ether is a potent phosphodiesterase (PDE)3/4 inhibitor, it has potential for treating asthma against ovalbumin-induced airway hyperresponsiveness .
    Targets: PDE | IL Receptor | TNF-α
    3-O-Methylquercetin tetraacetate Description
    Source: The herbs of Croton cascarilloides
    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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    Calculate Dilution Ratios(Only for Reference)
    1 mg 5 mg 10 mg 20 mg 25 mg
    1 mM 2.0644 mL 10.322 mL 20.6441 mL 41.2882 mL 51.6102 mL
    5 mM 0.4129 mL 2.0644 mL 4.1288 mL 8.2576 mL 10.322 mL
    10 mM 0.2064 mL 1.0322 mL 2.0644 mL 4.1288 mL 5.161 mL
    50 mM 0.0413 mL 0.2064 mL 0.4129 mL 0.8258 mL 1.0322 mL
    100 mM 0.0206 mL 0.1032 mL 0.2064 mL 0.4129 mL 0.5161 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.
    3-O-Methylquercetin tetraacetate References Information
    Citation [1]

    Planta Med.,2007,73(11):1156-62.

    Potent suppressive effects of 3-O-methylquercetin 5,7,3',4'-O-tetraacetate on ovalbumin-induced airway hyperresponsiveness.[Pubmed: 17823872 ]
    We investigated the suppressive effects of 3-O-methylquercetin 5,7,3',4'- O-tetraacetate (QMTA), a more-potent phosphodiesterase (PDE)3/4 inhibitor than quercetin 3-O-methyl ether (3-MQ), which has been reported to have the potential for treating asthma, against ovalbumin (OVA)-induced airway hyperresponsiveness (AHR). The IC50 value of QMTA for PDE3 was significantly less than that for PDE4. According to the Lineweaver-Burk analysis, QMTA (1-10 microM) competitively inhibited PDE3 and PDE4 activities. The Ki values were 0.9+/-0.3 (n=5) and 3.9+/-0.5 (n=5) microM, respectively, which significantly differed from each other, suggesting that QMTA has higher affinity for PDE3 than for PDE4. QMTA (3-10 microM) concentration-dependently relaxed the baseline level, and significantly inhibited cumulative OVA (10-100 microg/mL)-induced contractions in isolated sensitized guinea pig trachealis suggesting that QMTA has bronchodilator and inhibiting effects on mast cell degranulation. After the secondary challenge, the AHR was measured in unrestrained OVA-sensitized mice, with nebulized methacholine (MCh, 6.25-50 mg/mL), by barometric plethysmography using a whole-body plethysmograph. In the present results, QMTA (3-10 micromol/kg, I. P.) dose-dependently attenuated the enhanced pause (Penh) value induced by MCh (25-50 mg/mL). QMTA (3-10 micromol/kg, I. P.) also significantly inhibited total inflammatory cells, macrophages, neutrophils, lymphocytes, and eosinophils in BALF after determination of Penh values. It also significantly suppressed the release of interleukin (IL)-2, IL-4, IL-5, IFN-gamma, and TNF-alpha, with the exception that 3 micromol/kg QMTA did not suppress the releases of IL-5. QMTA even at 1 micromol/kg significantly inhibited eosinophils, IL-2, and TNF-alpha. In conclusion, our results strongly suggest that QMTA has greater potential than 3-MQ for the treatment of asthma.