Fig. 6.

Leaching of quaternary ammonium moieties from QAMS-containing acrylic disks (bromophenol blue assay). (A) Baseline and 3 month aging in deionized water. (B) Aging in the absence of porcine liver esterase in phosphate-buffered saline (PBS) for 2 weeks. Note that the scales of the y-axis in the two charts are different. For each parameter (upper case letters for baseline and lower case letters for 3 months in (A) and upper case letters for no esterase and lower case letters for with esterase in (B)), groups with the same letters are not statistically significant (p > 0.05; note: only groups that are not significantly different are labeled). For comparisons between baseline and 3 months, groups connected with a bar are not statistically significant (p > 0.05).