3-O-Methylquercetin
3-O-Methylquercetin is a selective and competitive PDE3/PDE4 inhibitor, and inhibits PDE3 than PDE4 with a low K(m) value; it inhibits total cAMP- and cGMP-phosphodiesterase (PDE) of guinea pig trachealis at low concentrations. 3-O-Methylquercetin has antiviral, anti-inflammatory and bronchodilating effects, and has the potential for use in the treatment of asthma at a dose without affecting blood pressure.
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Recommended storage conditions and precautions regarding proper product handling are contained in the product Certificate of Analysis (COA). Here are general storage guidelines for compounds:
Powder: -20°C 3 years and 4°C 2 years
In solvent: -80°C 6 months and -20°C 1 month
If the solution is stored at -20°C for more than one month, it should be re-examined to ensure its efficacy. Avoid repeated freeze and thaw cycles.
Storage conditions for some special products should refer to their COAs.
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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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