Effect of pH on acetylcholinesterase Langmuir and Langmuir-Blodgett films studied by surface potential and atomic force microscopy

Leila Dziri, Salah Boussaad, Nongjian Tao, Roger M. Leblanc

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

Surface potential measurements have been used to determine the dipole interactions of the acetylcholinesterase (AChE) monolayer at the air/aqueous interface. The results show that it is the ionogenic groups of the enzyme that cause significant changes in the surface potential of the monolayer as the pH of the sub-phase is changed. The atomic force microscope (AFM) images of AChE Langmuir-Blodgett (LB) films indicate that at low pH, an unfolding of the enzyme occurs which leads to formation of large domains at the air/aqueous interface rather than an organized AChE monolayer. Furthermore, the AFM images of the AChELB film prepared at basic pH show that the enzyme forms aggregates.

Original languageEnglish (US)
Pages (from-to)56-59
Number of pages4
JournalThin Solid Films
Volume327-329
Issue number1-2
DOIs
StatePublished - Jan 1 1998

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Keywords

  • Acetylcholinesterase
  • Atomic force microscopy
  • Langmuir-Blodgett films

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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