{"title":"Determination of protein deposits on RGP lenses by X-ray photoelectron spectroscopy.","authors":"H Ichijima, T Kawai, K Yamamoto, H D Cavanagh","doi":"","DOIUrl":null,"url":null,"abstract":"<p><strong>Purpose: </strong>To establish a novel and objective screening method for evaluating the cleaning efficacy of contact lens care solutions for removal of protein deposits on single rigid gas permeable (RGP) lenses.</p><p><strong>Methods: </strong>New and unworn RGP lenses containing no nitrogen atoms were incubated in a standard tear protein test solution. Protein deposition on lenses was determined by X-ray photoelectron spectroscopy (XPS) before and after standardized cleaning with commercially available care solutions (daily cleaners A, B) and a wetting/soaking solution or with 0.1w/v% sodium dodecyl sulfate (SDS) as a control. Cleaning efficacy was calculated based on the percentage of nitrogen atoms present in the total elements of the measured XPS scan spectrum.</p><p><strong>Results: </strong>Nitrogen atoms originating from residual protein deposits on RGP lenses after cleaning were determined by XPS. The cleaning efficacy of the wetting/soaking solution was lower (74%) than that of daily cleaners A and B (95%) or SDS (96%) controls.</p><p><strong>Conclusions: </strong>XPS determination of residual protein deposits is a novel and direct evaluation method for determining the cleaning efficacy of RGP lens care solutions for single lenses.</p>","PeriodicalId":22367,"journal":{"name":"The CLAO journal : official publication of the Contact Lens Association of Ophthalmologists, Inc","volume":"26 1","pages":"18-20"},"PeriodicalIF":0.0000,"publicationDate":"2000-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"The CLAO journal : official publication of the Contact Lens Association of Ophthalmologists, Inc","FirstCategoryId":"1085","ListUrlMain":"","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Purpose: To establish a novel and objective screening method for evaluating the cleaning efficacy of contact lens care solutions for removal of protein deposits on single rigid gas permeable (RGP) lenses.
Methods: New and unworn RGP lenses containing no nitrogen atoms were incubated in a standard tear protein test solution. Protein deposition on lenses was determined by X-ray photoelectron spectroscopy (XPS) before and after standardized cleaning with commercially available care solutions (daily cleaners A, B) and a wetting/soaking solution or with 0.1w/v% sodium dodecyl sulfate (SDS) as a control. Cleaning efficacy was calculated based on the percentage of nitrogen atoms present in the total elements of the measured XPS scan spectrum.
Results: Nitrogen atoms originating from residual protein deposits on RGP lenses after cleaning were determined by XPS. The cleaning efficacy of the wetting/soaking solution was lower (74%) than that of daily cleaners A and B (95%) or SDS (96%) controls.
Conclusions: XPS determination of residual protein deposits is a novel and direct evaluation method for determining the cleaning efficacy of RGP lens care solutions for single lenses.
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