Activities of white tea sub-fraction (< 1000 Da) alone and in different combinations with 4.8 mM copper (II) sulphate and 4.8 mM vitamin C against S. aureus NCTC 06571. (WTF = white tea fraction, Vit C = vitamin C, Cu = copper (II) sulphate, '+' = combination specified. Mixtures were allowed to stand for 10 minutes before addition of culture. Sample volumes of 500 μL of Cu+Vit, WTF+Cu and WTF+Cu+Vit were used to reduce the detection limit. Bars show SEMs).