Cholesterol is one of the common additives included in
the formulation in order to prepare stable niosomes. Cholesterol
stabilizes bilayers, prevents leakiness, and retards
permeation of solutes enclosed in the aqueous core of these
vesicles. Cholesterol is known to abolish the gel to lipid phase
transition of niosome systems (35), which could be able to
effectively prevent leakage of drug from niosomes (36).
Cholesterol is thus usually included in a 1:1 molar ratio
(non-ionic surfactant: cholesterol) in most formulations.
However even after the addition of cholesterol, the intrinsic
phase transition behaviour of vesicle forming surfactants still
influences the properties of the dispersion: notably the
membrane permeability, encapsulation efficiency and bilayer
rigidity (10). DCP, a charged molecule, is often used to
prevent niosome aggregation (35) and increase the stability of
niosome dispersions (37).
Cholesterol is one of the common additives included in
the formulation in order to prepare stable niosomes. Cholesterol
stabilizes bilayers, prevents leakiness, and retards
permeation of solutes enclosed in the aqueous core of these
vesicles. Cholesterol is known to abolish the gel to lipid phase
transition of niosome systems (35), which could be able to
effectively prevent leakage of drug from niosomes (36).
Cholesterol is thus usually included in a 1:1 molar ratio
(non-ionic surfactant: cholesterol) in most formulations.
However even after the addition of cholesterol, the intrinsic
phase transition behaviour of vesicle forming surfactants still
influences the properties of the dispersion: notably the
membrane permeability, encapsulation efficiency and bilayer
rigidity (10). DCP, a charged molecule, is often used to
prevent niosome aggregation (35) and increase the stability of
niosome dispersions (37).
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