Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Chemical compound
Gallocatechin gallate (GCG) is the ester of gallocatechin and gallic acid and a type of catechin. It is an epimer of epigallocatechin gallate (EGCG).
In a high temperature environment, an epimerization change is likely to occur, because heating results in the conversion from EGCG to GCG.[1] According to the referenced study the resulting GCG (the epimer of EGCG) results in even lower dietary cholesterol absorption than occurs with EGCG. While this may be a beneficial outcome with respect to cholesterol reduction activity, for those wishing to maximize the EGCG content of green tea infusions, it is still appropriate to use high temperatures, as long as it is taking into account that extreme conditions will lead to small reductions in total EGCG, for example a 12.4% reduction in total EGCG when heated for 30 minutes at 100 °C.[2]
^Ikeda, Ikuo; Kobayashi, Makoto; Hamada, Tadateru; Tsuda, Koichi; Goto, Hitomi; Imaizumi, Katsumi; Nozawa, Ayumu; Sugimoto, Akio; Kakuda, Takami (2003). "Heat-Epimerized Tea Catechins Rich in Gallocatechin Gallate and Catechin Gallate Are More Effective to Inhibit Cholesterol Absorption than Tea Catechins Rich in Epigallocatechin Gallate and Epicatechin Gallate". Journal of Agricultural and Food Chemistry. 51 (25): 7303–7. doi:10.1021/jf034728l. PMID 14640575.
^Wang, Rong; Zhou, Weibiao; Jiang, Xiaohui (2008). "Reaction Kinetics of Degradation and Epimerization of Epigallocatechin Gallate (EGCG) in Aqueous System over a Wide Temperature Range". Journal of Agricultural and Food Chemistry. 56 (8): 2694–701. doi:10.1021/jf0730338. PMID 18361498.
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Gallocatechol or gallocatechin (GC) is a flavan-3-ol, a type of chemical compound including catechin, with the gallate residue being in an isomeric trans...
gallate (EGCG), also known as epigallocatechin 3-gallate, the ester of epigallocatechin and gallic acid, and a type of catechin Gallocatechingallate...
458.084911) may refer to: Epigallocatechin gallate (EGCG), a flavanol found in green tea Gallocatechingallate (GCG), an epimer of EGCG formed in high temperature...
3'-O-gallate can be found in green tea leaves and prodelphinidin B-2 3,3'-di-O-gallate can be found in Myrica rubra. Prodelphinidin B3 (gallocatechin-(4α→8)-catechin)...
Epicatechin gallate (ECG) is a flavan-3-ol, a type of flavonoid, present in green tea. It is also reported in buckwheat and in grape. The tea component...
and epicatechin gallate) and procyanidin oligomers. Grape skin extracts contain four monomers (catechin, epicatechin, gallocatechin and epigallocatechin)...
enzymatic oxidation and condensation of two gallocatechins (epigallocatechin and epigallocatechin gallate) with the participation of polyphenol oxidases...
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