Table 1.

The antimicrobial effect of different levels of copper (II) sulphate against S. aureus NCTC 06571 after 30 minute incubations at room temperature

Concentration of copper (II) sulphate added in assay*	Typical approximate reduction in viability following 30 minute exposure log 10 cfu mL-1 (SEM)
0 μM	N/A
0.56 μM*	N/A
1.00 μM	~0.75 (± 0.74)
4.8 mM	~2.50 (± 0.68)
9.6 mM	~3.50 (± 0.69)

N/A = not applicable as no reduction was seen. * Equivalent concentration to copper level found in whole white tea extract (0.14 mg L^-1) by ICP-AES. SEMs shown in brackets.