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Polímeros

versão impressa ISSN 0104-1428versão On-line ISSN 1678-5169

Resumo

Interaction between cholesterol and chitosan in Langmuir monolayers. Polímeros [online]. 2005, vol.15, n.2, pp.91-94. ISSN 1678-5169.  http://dx.doi.org/10.1590/S0104-14282005000200006.

Chitosan incorporated in the aqueous subphase is found to affect the Langmuir monolayers of cholesterol, causing the surface pressure and the surface potential isotherms to become more expanded. The mean molecular area per cholesterol molecule in the condensed monolayer increases from 53 Å2 in the absence of chitosan to 61 Å2 for a concentration of 0.100 mg/mL of chitosan in the subphase. If additional chitosan is incorporated in the subphase, no change is noted, which points to saturation in the effects from chitosan. The interaction between chitosan and cholesterol probably occurs via hydrogen bonding. The monolayer expansion is also manifested in the monolayer morphology, as indicated by Brewster angle microscopy measurements, where larger cholesterol domains are visualized when chitosan is present in the subphase.

Palavras-chave : Cholesterol; chitosan; Langmuir monolayers.

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