Arbutin blocks defects in the ripple phase of DMPC bilayers by changing carbonyl organization.
Chem Phys Lipids
; 147(1): 22-9, 2007 May.
Article
em En
| MEDLINE
| ID: mdl-17442288
ABSTRACT
The effect of arbutin, a 4-hydroxyphenyl-beta-glucopyranoside, on dimyristoylphosphatidylcholine (DMPC) bilayers was studied by turbidimetry, EPR and FTIR spectroscopies. The disruption of DMPC multilamellar vesicles (MLV's) with monomyristoylphosphatidylcholine (lysoPC), a product of hydrolysis of phospholipase A(2) (PLA(2)), is more efficient at 18 degrees C, where DMPC MLV's are known to be in the ripple P(beta') phase, than at 10 degrees C (L(beta') flat gel phase). Disruption at 18 degrees C was inhibited by increasing concentrations of arbutin in the solution. This inhibition was correlated with the disappearance of the ripple phase in MLV's when arbutin is present. Shifts in FTIR carbonyl bands caused by arbutin or by temperature changes allow us to propose a model. It is interpreted that the changes in the water-hydrocarbon interface caused by arbutin, forcing a reaccommodation of the carbonyl groups, eliminate the topological defects in the lattice due to mismatches among regions with different area per lipid where lysoPC can insert.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Arbutina
/
Dimiristoilfosfatidilcolina
/
Bicamadas Lipídicas
Idioma:
En
Revista:
Chem Phys Lipids
Ano de publicação:
2007
Tipo de documento:
Article
País de afiliação:
Argentina