title: Accelerated study on lysozyme deposition on poly(HEMA) contact lenses.
abstract: A technique was developed to accelerate lysozyme deposition on poly(HEMA) contact lenses and measure the amounts of the deposited lysozyme. This technique was for evaluation of bendazac lysine solution, a contact lens cleaning and wetting solution. Effect of temperature on lysozyme deposition on poly(HEMA) contact lenses was examined. Five temperatures ranging from 25 degrees C to 90 degrees C were chosen to examine the temperature effect. The amounts of lysozyme deposited on poly(HEMA) contact lenses at 25 C and 60 C were 0.27 microg/lens and 0.61 microg/lens, respectively. The amount increased sharply to 23 microg/lens at 70 degrees C with the maximum of 31 microg/lens at 90 degrees C. Kinetics of lysozyme deposition on poly(HEMA) contact lenses was examined at 80 degrees C. Lysozyme deposition increased sharply during the first 2 h and reached a plateau after 2 h. Effectiveness of various cleaning procedures was examined using bendazac lysine solution. When the contact lenses were washed without rubbing with fingers, the bendazac lysine reduced the amount of deposited lysozyme by more than 40% from 18.3 microg/lens to 10.6 microg/lens. The effect of bendazac lysine was most prominent when the contact lenses were shaken during storage in the presence of lysozyme in solution. If the contact lenses were cleaned by rubbing with fingers, the effect of bendazac lysine solution on the prevention of lysozyme deposition was negligible.
authors.affiliation: Purdue University, School of Pharmacy, West Lafayette, IN 47907-1336, USA.
authors.forename: A
authors.initials: A
authors.lastname: Kidane
authors.forename: J M
authors.initials: JM
authors.lastname: Szabocsik
authors.forename: K
authors.initials: K
authors.lastname: Park
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D018639:Contact Lens Solutions / Q000737:chemistry; D003261:Contact Lenses; D007191:Indazoles / Q000737:chemistry; D007457:Iodine Radioisotopes; D007700:Kinetics; D009113:Muramidase / Q000737:chemistry*; D011102:Polyhydroxyethyl Methacrylate / Q000737:chemistry*; D013696:Temperature
chemical_list: D001672:Biocompatible Materials; D018639:Contact Lens Solutions; D007191:Indazoles; D007457:Iodine Radioisotopes; D011102:Polyhydroxyethyl Methacrylate; C036067:bendazac lysine; D009113:Muramidase