Rinsability of Orthophthalaldehyde from Endoscopes

Table 5

Zones of Inhibition (ZOI) of the growth of S. aureus surrounding sections of endoscope insertion tube materials after three 10-minute exposures to OPA, three 100 mL rinses, followed by wiping with acetonitrile or 3% hydrogen peroxide and three 100 mL rinses. The numbers reported are the mean ± standard deviation of three replicates in mm.

Endoscope material	OPA	Acetonitrile		3% hydrogen peroxide
	Three 10 min exposures/rinses^a; ZOI (mm)	Three 10 min OPA exposures/rinses^a, Wipe/rinses^b; ZOI (mm)	Wipe/ rinses^b; ZOI (mm)	Three 10 min OPA exposures/rinses^a, Wipe/rinses^b; ZOI (mm)	Wipe/ rinses^b; ZOI (mm)
Viton	14±0	0±0	0±0	11±1	0±0
Insertion tube	21±1	19±0.6	0±0	20±1	0±0

^a Inbetween each 10 minutes OPA soak materials were rinsed three times with 100 mL of tap water.
^b After wiping with acetonitrile or hydrogen peroxide materials were rinsed three times with 100 mL of tap water.