. 2017 Jul 19;7:5911. doi: 10.1038/s41598-017-05976-9

Table 1.

Zone of inhibition assays for metal combinations against E. faecium, A. baumannii and K. pneumoniae (mm) demonstrating that platinum/palladium, gold/palladium or gold/platinum demonstrated the greatest antimicrobial activity.

		AgCu	AgPt	AgAu	AuPd	CuPt	CuAu	CuPd	AuPt	AuPd	PtPd
50 mgL⁻¹	E. faecium	0	0	0	0	0	0	0	0	0	0
	A. baumannii	1	2	2	2	1	1	1	2	2	2
	K. pneumoniae	1	2	2	2	1	1	1	2	2	2
100 mgL⁻¹	E. faecium	1	2	2	2	1	1	1	2	2	2
	A. baumannii	1	2	2	2	1	1	1	4	4	4
	K. pneumoniae	1	2	2	2	1	1	1	4	4	4
500 mgL⁻¹	E. faecium	2	3	3	3	3	3	3	4	4	4
	A. baumannii	4	5	5	5	4	4	4	6	6	6
	K. pneumoniae	4	5	5	5	4	4	4	6	6	6
1000 mgL⁻¹	E. faecium	4	4	4	4	4	4	4	6	6	6
	A. baumannii	4	6	6	6	6	6	6	8	8	8
	K. pneumoniae	4	6	6	6	6	6	6	8	8	8

Au = gold, Cu = copper, Pt = platinum, Pd = palladium and Ag = silver (n = 3). The inhibition zones were graded from 0 to 4, which measured as, 0–4 mm = grade 0, 4–8 mm = grade 1, 8–12 mm = grade 2, 12–16 mm = grade 3 and 16–20 mm = grade 4.