Gallocatechin gallate gcg

Eight tea catechin derivatives – (+)-catechin(C), (−)-epicatechin (EC), (−)-gallocatechin (GC), (−)-epigallocatechin (EGC), (+)-catechin gallate (CG), (−)-epicatechin gallate (ECG), (−)-gallocatechin gallate (GCG), and (−)-epigallocatechin gallate (EGCG) – were purchased from Sigma (St. Louis, MO, USA). The compounds, purified using the HPLC system, were of analytical grade. We purchased 2,2′-Azinobis (3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS), 1,1-diphenyl-2-picrylhydrazyl (DPPH), 2,4,6-tripyridyl-s-triazine (TPTZ), and all other chemicals from Sigma Aldrich (St. Louis, MO, USA) and all were of analytical grade.

The standards for gallic acid (GA), (+)–catechin (C), (−)–epicatechin (EC), (−)–epigallocatechin (EGC), (−)–gallocatechin gallate (GCG), (−)–epigallocatechin gallate (EGCG), (−)–epicatechin gallate (ECG), and caffeine were purchased from Sigma–Aldrich (Darmstadt, Germany). The mixture of amino acids standards was purchased from Sykam (Munich, Germany). n–Alkanes were purchased from Sigma–Aldrich (Darmstadt, Germany). Aroma standards including ethyl decanoate (99 %), benzaldehyde (99.5 %), octanal (99 %), benzyl alcohol (99.5 %), phenylacetaldehyde (95 %), linalool (98 %), nonanal (96 %), terpineol (95 %), geraniol (99 %), (Z)–3–hexenyl hexanoate (98 %), β–ionone (97 %), cedrol (98 %), and methyl jasmonate (98 %), were purchased from Aladdin (Shanghai, China). Aroma standards including hexanal (98 %), (Z)–3–hexenyl acetate (97 %), linalool oxide mixture (97 %), 2–phenylethyl alcohol (98 %), methyl salicylate (99 %), indole (99 %), (Z)–jasmone (92 %), α–ionone (90 %), nerolidol (97 %), and (Z)–3–hexenyl benzoate (98 %) were purchased from Tokyo Chemical Industry Co., ltd (Tokyo, Japan). Aroma standard ocimene (90 %) was purchased from Yuanye Company (Shanghai, China).