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Updated: Dec 19, 2025

Author Spotlight: Studying Behavior of Acanthamoeba to Develop Targeted Strategies for Preventing Acanthamoeba Keratitis
Published on: September 20, 2024
Anti-Acanthamoeba effect of potassium isostearate for use as a multipurpose solution
Haruna Sasaki1, Toshinari Koda2, Hiroshi Morita3
1Graduate School of Environmental Engineering, the University of Kitakyushu.
Abstract:
Acanthamoeba is one of the organisms that cause corneal infection. In this study, attention was focused on potassium isostearate (iso-C18K, a branched chain fatty acid salt) for use in a multipurpose solution (MPS) against Acanthamoeba. An anti-amoebic test against Acanthamoeba castellanii ATCC 30010 (trophozoites type) was conducted. As a result, a growth reduction effect of 4 log units (99.99% suppression) was observed after incubation with 150 mM (5.0 w/v%) iso-C18K for 10 minutes. Furthermore, after the amoeba suspension was mixed with iso-C18K, disruption of cell membranes were observed, and the minimum amoebacidal concentration (MAC) at that time was 9.6 mM (0.31 w/v%). To evaluate the effectiveness as an MPS, assessment by verification tests was conducted using contact lenses. Reducing the concentration of iso-C18K caused a decrease in the number of viable cells, which was confirmed at a MAC of 1.2 mM (0.039 w/v%).
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