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Table 3

Leaching of Cu and Ag determined after 24 h of contact with A. baumannii isolates in diluted nutrient media at 22 °C

c (mg L⁻¹)		1	2	4	8	16	32	64	128	256	512	1,024
CuNZ	Mean	<0.02	<0.02	<0.02	0.041	0.119	0.247	0.357	0.456	0.701	1.090	1.291
	±SD	–	–	–	0.010	0.043	0.124	0.089	0.064	0.052	0.050	0.190
	%	–	–	–	32	46	48	34	22	17	13	8
AgNZ	mean	<0.02	<0.02	<0.02	<0.02	<0.02	<0.02	0.024	0.040	0.076	0.145	0.223
	±SD	–	–	–	–	–	–	0.011	0.018	0.018	0.021	0.038
	%	–	–	–	–	–	–	1	0.9	0.8	0.8	0.6

c (mg L⁻¹)		1	2	4	8	16	32	64	128	256	512	1,024
CuNZ	Mean	<0.02	<0.02	<0.02	0.041	0.119	0.247	0.357	0.456	0.701	1.090	1.291
	±SD	–	–	–	0.010	0.043	0.124	0.089	0.064	0.052	0.050	0.190
	%	–	–	–	32	46	48	34	22	17	13	8
AgNZ	mean	<0.02	<0.02	<0.02	<0.02	<0.02	<0.02	0.024	0.040	0.076	0.145	0.223
	±SD	–	–	–	–	–	–	0.011	0.018	0.018	0.021	0.038
	%	–	–	–	–	–	–	1	0.9	0.8	0.8	0.6

The c (mg L⁻¹) is the concentration of metal-exchanged-zeolite in the experimental vial and (%) is the percentage of leached metal from the total metal load on the zeolite; c₀ (A. baumannii) = 10⁵ CFU ml⁻¹. The value of <0.02 mg L⁻¹ designates measurement below the detection limit.

SD, standard deviation.

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