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Assembly of Cell Mimicking Supported and Suspended Lipid Bilayer Models for the Study of Molecular Interactions
Published on: August 3, 2021
Ascorbyl palmitate interaction with phospholipid monolayers: electrostatic and rheological preponderancy
Milagro Mottola1, Natalia Wilke, Luciano Benedini
1Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC-CONICET), Departamento de Química Biológica, Facultad de Ciencias Químicas, Universidad Nacional del Córdoba, Haya de la Torre y Medina Allende, Ciudad Universitaria, X5000HUA Córdoba, Argentina.
Ascorbyl palmitate (ASC16) interacts complexly with model membranes, penetrating phospholipid monolayers and influencing membrane fluidity. Its adsorption and penetration depend on pH and membrane properties, impacting its pharmacological function.
Area of Science:
- Biochemistry
- Physical Chemistry
- Pharmacology
Background:
- Ascorbyl palmitate (ASC16) is an amphiphilic molecule with antioxidant properties.
- ASC16 is of pharmacological interest due to its potential interactions with biological membranes.
Purpose of the Study:
- To investigate the interaction of ASC16 with model membranes.
- To elucidate the factors regulating ASC16 adsorption and penetration into phospholipid monolayers.
Main Methods:
- Langmuir monolayer experiments using dimiristoylphosphatidylcholine (DMPC) and ASC16.
- Surface pressure measurements and rheological property analysis.
- Investigation of ASC16 aggregation and adsorption kinetics under varying pH conditions.
Main Results:
- ASC16 strongly interacted with and penetrated phospholipid monolayers, with adsorption and penetration exhibiting biphasic behavior.
- Membrane fluidity, influenced by cholesterol, and subphase pH significantly affected ASC16 penetration and aggregation.
- A partition coefficient of 1.5×10(5) and ΔGp of -6.7 kcal·mol(-1) were estimated for ASC16 in DMPC monolayers.
Conclusions:
- ASC16 interaction with model membranes is complex and regulated by multiple factors.
- Understanding ASC16's aggregation and membrane interaction is crucial for its pharmacological applications.
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