The Effects of Additives on Lipid
Bilayers
Introduction and Prior
Research:
I am
currently researching the effects of small molecules on lipid vesicle phase
ratios. These lipid vesicles are comprised of a lipid bilayer
that forms in three general structures, the fluid liquid disordered phase,
the less fluid and more rigid gel phase, and the “in-between” ordered
but still fluid liquid ordered phase.
Clozapine was additive analyzed with the lipid
vesicle system. To analyze the
experimental small molecule, it is mixed into a solution of equimolar
DOPC and DPPC.
The mixture also includes DiD, a
lipophilic dye, known to incorporate only into the
liquid disordered regions of lipid bilayers.
The mixture undergoes electrolysis to form lipid
vesicles. The resultant solution is then
examined using a Zeiss LSM 510 confocal
fluorescent microscope. The fluorochrome DiD
is known to incorporate specifically into the liquid disordered phase of vesicles,
allowing confirmation of the disordered phase.
Using confocal microscopy allows for
three-dimensional accuracy, creating a 3-D rendering of the vesicle. Additionally, the vesicle is analyzed through
its Z-axis at X-Y plane slices of the vesicles.

X-Y
Slices of a lipid vesicle