Table 1.

Overview of coatings tested

Coating	Antimicrobial agent	Nanocompound	Reported effect	Substrate		Log reduction		% inhibition
				SS	G	SS	G	SS	G
AMC-01	Titanium dioxide	Yes	Bactericidal	SS	G	6.6	2.0	100	32
AMC-02	Silver	Yes	Bactericidal		G		6.1		100
AMC-03	Silver	Yes	Bactericidal		G		6.1		100
AMC-04	Polysilazane	No	Antifouling	SS	G	4.4	1.3	93	23
AMC-05	Poly(dimethylsiloxane)	No	Antifouling	SS	G	4.7	3.2	100	54
AMC-06	Silver	Yes	Bactericidal	SS		5.5		100
AMC-07	Silver	Yes	Bactericidal	SS		5.5		100
AMC-08	Silver	Yes	Bactericidal	SS		5.5		100
AMC-09	Triclosan	No	Dose-dependent#		G		6.2		100
AMC-10	Wood extract	No	Unknown	SS	G	3.6	1.9	65	31
AMC-11	Cationic salts	No	Bactericidal	SS	G	1.8	1.9	32	31
AMC-12	Wood extract	No	Unknown	SS	G	1.7	1.9	32	31
AMC-13	Silver	Yes	Bactericidal		G		6.1		100
AMC-14	Silver	Yes	Bactericidal		G		5.8		95
AMC-15	Silver	Yes	Bactericidal		G		5.8		95
AMC-16	Silver	Yes	Bactericidal		G		6.1		100
AMC-17	Quaternary ammonium	No	Bactericidal		G		6.1		100
AMC-18	Quaternary ammonium	No	Bactericidal		G		6.1		100
AMC-19	Silver	Yes	Bactericidal		G		6.0		100
AMC-20	Silver	Yes	Bactericidal		G		6.0		100
AMC-21	CMIT/MIT	No	Bactericidal	SS	G	3.4	5.7	99	93
AMC-22	Silver	Yes	Bactericidal	SS	G	3.2	6.2	94	100
AMC-23	Zinc pyrithione	No	Bacteriostatic	SS	G	3.4	6.1	100	100

Notes: We received 23 coatings from eleven manufacturers, which have been encrypted in the table. Listed in columns, from left to right are: the AMC numbers; the antimicrobial agent in each coating; whether based on nanotechnology; the substrates on which the coatings were provided (SS or G); and the log reduction and % inhibition values after testing according to the ISO 22196:2011 protocol.

^#Triclosan is bacteriostatic at a low dose and bactericidal at a higher dose (dose not given).

Abbreviations: AMC, antimicrobial coating; CMIT, chloromethylisothiazolinone; G, glass; ISO, International Organization for Standardization; MIT, methylisothiazolinone; SS, stainless steel.