1. BY : KESSHIA ROBALINO PD: 4 BY : KESSHIA ROBALINO PD: 4

2. Reactions: Reactions: – Enzymes polyphenol oxidase (PPO) Peroxidase (PO) Polyphenols Polyphenols Catechin -> C Picatechin -> EC Epichatechin gallate -> ECG Epigallocatechin gallate - > EGCG Gallocatechin -> GC Epigallocatechin(EGC) Reactions: Reactions: – Enzymes polyphenol oxidase (PPO) Peroxidase (PO) Polyphenols Polyphenols Catechin -> C Picatechin -> EC Epichatechin gallate -> ECG Epigallocatechin gallate - > EGCG Gallocatechin -> GC Epigallocatechin(EGC) Inorganic components: Inorganic components:  K, Ca, Ph, Mg, Mn, Fe, S, Al, Na, Si, Zn, and Cu.  Three-quarters of the nitrogen: amino acids (theanine)  alkaloid caffeine.  carbohydrates Inorganic components: Inorganic components:  K, Ca, Ph, Mg, Mn, Fe, S, Al, Na, Si, Zn, and Cu.  Three-quarters of the nitrogen: amino acids (theanine)  alkaloid caffeine.  carbohydrates

3. STRUCTURES OF TEA (CATECHINS) STRUCTURES OF TEA (CATECHINS)

4. Tea comes from one plant, Camellia Sinensis C, EC, ECG, GC, EGC, & EGCG are oxidized by the enzyme PPO 1 st : orthoquinones (very unstable & reactive) Function: hydrogen acceptors / hydrogen donors combinations :C-O or C- C bonds [theaflavins (TF)] EGC + EC = Theaflavin EGCG + EC = Theaflavin-3 monogallate EGCG + ECG = Theaflavin 3’3’ digallate EGC + ECG = Theaflavin –3’- monogallate GC + EC = sotheaflavin GC + C = Neotheaflavin

5. PROTEINS CARBOHYDRATES FATS VITAMINS TRACE ELEMENTS FIBRE alkaloid caffeine Orthoquinones methylxanthine caffeine ANTIOXIDANTS