EGC -epigallocatechin

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.

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. 

Fig. 2.62. HPLC chromatogram of (a) jasmin (green) tea, (b) Fujian Oolong tea, (c) pu-erh tea and (d) black tea at 280 nm. Peak identification 1 = gallic acid (GA) 2 = (-)-epigallocatechin (EGC) 3 = (-)-epigallocatechin gallate (EGCG) 4 = epicatechin (EC) 5 = (-)-epicatechin gallate (ECG) 6 = caffeine (CA) 7 = ( — )-catechin gallate (CG). Reprinted with permission from Y. Zuo et al. [178].

Fig. 2.64. Representative chromatogram of tea infusions. Conditions C18 column acetonitrile-aqueous acetate buffer gradient absorbance at 210 nm. Peak identities 1 = epigallocatechin (EGC) 2 = caffeine 3 = epicatechin (EC) 4 = epigallocatechin gallate EGCG) 5 = epicatechin gallate (ECG) 6 = internal standard (naringenin). Reprinted with permission from W. E. Bronner et al. [180].

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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