Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/171418
Title: Cholesterol effect on the specific capacitance of submicrometric DOPC bilayer patches measured by in-liquid scanning dielectric microscopy
Author: Muzio, Martina Di
Millán Solsona, Rubén
Borrell Hernández, Jordi
Fumagalli, Laura
Gomila Lluch, Gabriel
Keywords: Colesterol
Membranes (Biologia)
Cholesterol
Membranes (Biology)
Issue Date: 21-Oct-2020
Publisher: American Chemical Society
Abstract: The specific capacitance of biological membranes is a key physical parameter in bioelectricity that also provides valuable physicochemical information on composition, phase, or hydration properties. Cholesterol is known to modulate the physicochemical properties of biomembranes, but its effect on the specific capacitance has not been fully established yet. Here we use the high spatial resolution capabilities of in-liquid scanning dielectric microscopy in force detection mode to directly demonstrate that DOPC bilayer patches at 50% cholesterol concentration show a strong reduction of their specific capacitance with respect to pure DOPC bilayer patches. The reduction observed (around 35%) cannot be explained by the small increase in bilayer thickness (around 16%). We suggest that the reduction of the specific capacitance might be due to the dehydration of the polar head groups caused by the insertion of cholesterol molecules in the bilayer. The results reported confirm the potential of in-liquid SDM to study the electrical and physicochemical properties of lipid bilayers at very small scales (down to around 200 nm here), with implications in fields such as biophysics, bioelectricity, biochemistry, and biosensing.
Note: Versió postprint del document publicat a: https://doi.org/10.1021/acs.langmuir.0c02251
It is part of: Langmuir, 2020
URI: http://hdl.handle.net/2445/171418
Related resource: https://doi.org/10.1021/acs.langmuir.0c02251
Appears in Collections:Articles publicats en revistes (Institut de Nanociència i Nanotecnologia (IN2UB))
Articles publicats en revistes (Enginyeria Electrònica i Biomèdica)
Articles publicats en revistes (Institut de Bioenginyeria de Catalunya (IBEC))
Publicacions de projectes de recerca finançats per la UE
Articles publicats en revistes (Farmàcia, Tecnologia Farmacèutica i Fisicoquímica)

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