EC -epicatechin

Figure 5.3. Flavanol monomers (catechins, epicatechins, and their gallates) and pro-cyanidins. C catechin GC, gallocatechin EC, epicatechin EGC, epigallocatechin CG, catechin gallate GCG, gallocatechin gallate ECG, epicatechin gallate, EGCG, epigallocatechin gallate.

Fig. 2.115. Mass chromatograms of catechin monomers (m/z 289) and procyanidin oligomers (dimer through hexamers m/z 577 to 1729). C, ( + )-catechin, EC, ( — )-epicatechin, and PB2, procyanidin B2 as identified by the retention times of authentic standard. Reprinted with permission from J. Wollgast et al. [256].

Qu, quercetin K, kaempferol My, myricetin Lut, luteolin Apig, apigenin B-procyanidins EGC, epigallocatechin gallate C, catechin EC, epicatechin EGCG,... 

C, catechin EC, epicatechin EGC, epigallocatechin ECG, epicatechin gallate EGCG, epigallocatechin gallate GC, gallocatechin. 

Green tea is made by steaming or frying fresh tea leaves at elevated temperatures to prevent polyphenol oxidation. The chemical composition of green tea is similar to that of the fresh leaves regarding the major components. It contains polyphenols, which include flavanols, flavandiols, flavonoids, and phenolic acids. Flavanols are the most abundant constituents and are commonly known as catechins. The major catechins present in green tea are (-)-epicatechin (EC), (-)-epicatechin-3-gallate... 

Proportional composition of proanthocyanidins (in moles), and with the following subunit abbreviations EGC-P (-)-epigallocatechin extension subunit C-P (+)-catechin extension subunit EC-P (-)-epicatechin extension subunit C (+)-catechin terminal subunit ECG-P (-)-epicatechin-3-0-gallate extension subunit EC (-)-epicatechin terminal subunit ECG (-)-epicatechin-3-0-gallate terminal subunit Conversion yield (by mass) in the conversion of proanthocyanidin fraction to known subunits Mean degree of polymerization... 

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