The bio-tribological effect of poly-gamma-glutamic acid in the lysozyme-ionic contact lens system

Chen Ying Su, Lung Kun Yeh, Chi Chun Lai, Mihaela Dubuisson, Yi Fei Tsao, Ching Li Tseng, Hsu Wei Fang

Research output: Contribution to journalArticle

Abstract

Feeling comfortable is an important issue for contact lens wearers as contact lenses are worn for an extensive period of time. It has been shown that the in vitro friction coefficient of contact lenses is correlated to the degree of in vivo comfort, thus many studies focus on establishing friction testing methods for investigating the friction coefficient of contact lenses or contact lens care solution. We have previously demonstrated the lubricating property of poly-gamma-glutamic acid (γ-PGA)-containing care solution, and it could reduce the high friction coefficient caused by lysozyme. However, the mechanism of how γ-PGA-containing care solution reduces the lysozymeinduced friction coefficient of contact lenses is unclear. We investigated the bio-tribological effect of γ-PGA on ionic contact lenses in the presence of lysozyme by testing load and velocity variations. The ability to remove lysozyme deposition by γ-PGA and viscosity analysis of γ-PGA-containing care solutions were also investigated to understand the potential mechanism. Our results showed that the friction coefficient of γ-PGA-containing care solution with lysozyme was the lowest in both load and velocity variations, and γ-PGA functions distinctly in the lysozyme-ionic contact lens system. We proposed a model of how γ-PGA could reduce the friction coefficient in these two conditions.

Original languageEnglish
Article number156
JournalPolymers
Volume12
Issue number1
DOIs
Publication statusPublished - Jan 1 2020

Keywords

  • Bio-tribology
  • Ionic contact lens
  • Lysozyme
  • Poly-gamma-glutamic acid

ASJC Scopus subject areas

  • Chemistry(all)
  • Polymers and Plastics

Fingerprint Dive into the research topics of 'The bio-tribological effect of poly-gamma-glutamic acid in the lysozyme-ionic contact lens system'. Together they form a unique fingerprint.

  • Cite this