Effects of lead phytochemicals of Radix scutellariae on Acanthamoeba

Hie Hua Wong, Guangsen Shi, Keng Hung Maurice Yap, Maureen V. Boost

Research output: Journal article publicationJournal articleAcademic researchpeer-review

2 Citations (Scopus)


PURPOSE. Acanthamoeba keratitis (AK), which is associated with noncompliant use of contact lenses, remains difficult to treat due to delayed diagnosis and paucity of therapeutic agents. Although improvements in activity against Acanthamoeba infection have been achieved in disinfecting solutions for soft contact lenses, such modifications have not been extended to those for special rigid gas permeable (RGP) contact lenses, which are increasingly used for myopia control in children. Phytochemicals present in herbs used for traditional Chinese medicine may be effective as therapeutic or preventive agents. The purpose of this study was to investigate amoebicidal properties of lead phytochemicals of Radix scutellariae alone and in combination with multipurpose (disinfecting) solutions (MPS) for RGP lenses. METHODS. Viability of Acanthamoeba castellani and A. polyphaga trophozoites was determined following exposure to four phytochemicals: baicalin, baicalein, wogonoside, and oroxylin A and both alone and in combination with four RGP MPS, using a modified standalone technique. RESULTS. As individual agents, wogonoside and oroxylin A showed highest activity against A. castellani and A. polyphaga trophozoites, respectively. For both organisms, the combination of baicalein and oroxylin A was superior. Effectiveness of MPS alone did not exceed 0.27 log reduction, but addition of combined baicalein and oroxylin A resulted in 0.92 and 0.64 log reductions of A. castellani and A. polyphaga, respectively. CONCLUSIONS. The combination of baicalein and oroxylin A enhanced the activity of MPS for RGP contact lenses against trophozoites of two pathogens, A. castellani, and A. polyphaga, and offers a potential therapeutic and/or preventative agent for AK.
Original languageEnglish
Pages (from-to)6591-6595
Number of pages5
JournalInvestigative Ophthalmology and Visual Science
Issue number15
Publication statusPublished - 1 Dec 2016


  • Acanthamoeba
  • Contact lenses
  • Keratitis
  • Phytochemicals
  • TCM

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience


Dive into the research topics of 'Effects of lead phytochemicals of Radix scutellariae on Acanthamoeba'. Together they form a unique fingerprint.

Cite this