|Description:||1. Gallocatechins have antioxidant potential.|
|Source:||The wood of Acacia catechu (L.F.) Willd.|
|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: firstname.lastname@example.org
|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.|
|1 mg||5 mg||10 mg||20 mg||25 mg|
|1 mM||3.2651 mL||16.3255 mL||32.6509 mL||65.3019 mL||81.6273 mL|
|5 mM||0.653 mL||3.2651 mL||6.5302 mL||13.0604 mL||16.3255 mL|
|10 mM||0.3265 mL||1.6325 mL||3.2651 mL||6.5302 mL||8.1627 mL|
|50 mM||0.0653 mL||0.3265 mL||0.653 mL||1.306 mL||1.6325 mL|
|100 mM||0.0327 mL||0.1633 mL||0.3265 mL||0.653 mL||0.8163 mL|
Biol Pharm Bull. 2015;38(2):325-30.
|Biotransformation of (-)-epigallocatechin and (-)-gallocatechin by intestinal bacteria involved in isoflavone metabolism.[Pubmed: 25747993]|
|Four isoflavone-metabolizing bacteria were tested for their abilities to degrade (-)-epigallocatechin (EGC) and its isomer (-)-Gallocatechin (GC). Biotransformation of both EGC and (-)-Gallocatechin was observed with Adlercreutzia equolifaciens JCM 14793, Asaccharobacter celatus JCM 14811, and Slackia equolifaciens JCM 16059, but not Slackia isoflavoniconvertens JCM 16137. With respect to the degradation of EGC, strain JCM 14793 only catalyzed 4'-dehydroxylation to produce 4'-dehydroxylated EGC (7). Strain JCM 14811 mainly produced 7, along with a slight formation of the C ring-cleaving product 1-(3,4,5-trihydroxyphenyl)-3-(2,4,6-trihydroxyphenyl)propan-2-ol (1). Strain JCM 16059 catalyzed only C ring cleavage to form 1. Interestingly, the presence of hydrogen promoted the bioconversion of EGC by these bacteria. In addition, strain JCM 14811 revealed the ability to catalyze 4'-dehydroxylation of 1 to yield 1-(3,5-dihydroxyphenyl)-3-(2,4,6-trihydroxyphenyl)propan-2-ol (2) in the presence of hydrogen. In the case of (-)-Gallocatechin , strain JCM 14793 mainly produced C ring-cleaving product (1) with only a very small amount of 4'-dehydroxylated (-)-Gallocatechin (8), while Strain JCM 14811 only catalyzed 4'-dehydroxylation to form 8. Strain JCM 16059 formed 1. The bioconversion of (-)-Gallocatechin by the three strains was stimulated by hydrogen. Strain JCM 14793 showed the ability to convert 1 into 2 in the presence of hydrogen as did strain JCM 14811. Furthermore, strains JCM 14793 and JCM 14811 were found to have the ability to catalyze p-dehydroxylation of the pyrogallol moiety in the EGC metabolites 4-hydroxy-5-(3,4,5-trihydroxyphenyl)valeric acid (3) and 5-(3,4,5-trihydroxyphenyl)-γ-valerolactone (4), and this ability was enhanced by the presence of hydrogen.|
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. The initial oxidation leads to the formation of a mixture of A- and B- (or C-) ring phenoxyl 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. 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).|