(-)-Gallocatechin

(-)-Gallocatechin
Product Name (-)-Gallocatechin
CAS No.: 3371-27-5
Catalog No.: CFN99137
Molecular Formula: C15H14O7
Molecular Weight: 306.27 g/mol
Purity: >=98%
Type of Compound: Flavonoids
Physical Desc.: White powder
Targets: ROS
Source: The woods of Acacia catechu (L.F.) Willd.
Solvent: Chloroform, Dichloromethane, Ethyl Acetate, DMSO, Acetone, etc.
Price: $178/20mg
(-)-Epigallocatechin has been shown to exhibit antioxidant, anti-cancer and anti-inflammatory functions.
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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

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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    J. Am. Chem. Soc., 1995, 117(39):9881-8.
    Antioxidant Potential of Gallocatechins. A Pulse Radiolysis and Laser Photolysis Study[Reference: WebLink]
    Gallocatechins and catechins, which are constituents of green tea, and related, simpler single-ring model compounds undergo one-electron oxidation by the azidyl radical (k = (1.4-4.8) x 10(9) M(-1) s(-1)), which was used as a model one-electron, rapid oxidant.
    METHODS AND RESULTS:
    The initial oxidation leads to the formation of a mixture of A- and B- (or C-) ring phenoxyl radicals. This finding was confirmed by comparison with the spectra of 3,5-dihydroxyanisole (the model for A ring) and methyl gallate (the model for B or C ring) radicals and by photoionization experiments in which only the B-ring radical of epigallocatechin was generated, as expected from its lower ionization potential. The A-ring phenoxyl radical is converted to the B- (or C-) ring phenoxyl radical by inter- and intramolecular electron and proton transfer. The activation parameters clearly indicate solvent-assisted intermolecular electron and proton transfer, whereas intramolecular transfer in epigallocatechin gallate radicals is suggested to proceed through an intermediate molecular complex formation. Acid-base equilibria of parent gallocatechins (pK(al) > 8.0) are significantly altered in the corresponding phenoxyl radicals (pK(rl) = 4.4-5.5). The low reduction potentials of gallocatechin radicals, E(7) = 0.42 V (which is lower than that of vitamin E radicals, E(7) = 0.48 V), are responsible for their antioxidant efficacy, which may include the repair of vitamin E radicals. These low reduction potentials also imply high susceptibility of parent gallocatechins to rapid oxidation in aerated aqueous media. The reactivity of epigallocatechin gallate with superoxide radical at pH 7, k = 7.3 x 10(5) M(-1) s(-1) is one of the highest measured rates of reduction of superoxide radical by any chemical antioxidant. In this reaction, superoxide is converted to hydrogen peroxide, thus eliminating the redox cycling that may be involved in the corresponding oxidation reaction.
    CONCLUSIONS:
    The high rates of quenching of singlet oxygen by gallocatechins in acetonitrile, k = (1.1-2.2) x 10(8) M(-1) s(-1), are comparable to quenching by vitamin E, k = 5 x 10(8) M(-1) s(-1).
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