The procedure used to purify the apple procyanidin fraction with a degree of polymerisation of 4 (dp4) has been previously described (briefly detailed in Supporting Information)[17]. EGCG was isolated from green tea using methanolic extraction, followed by chromatographic separations using a pad of MN polyamide SC2 eluted batchwise followed by preparative reverse phaseHPLC (×2) using a 250 × 41.4mm id Dynamax-60A, 83-241-C (8 m, 60 A° ) C-18 column. Appropriate
fractions containing pure EGCG (as determined by LC-MS) were combined, evaporated and stored at −20C before use. A detailed description of the EGCG isolation process is provided in the Supporting Information.