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Surface equation of state for pulmonary surfactant monolayers at Air–Water interface: Protein–lipid binary mixture monolayers

Authors

  • Xuechao Gao,

    1. Chemical Engineering Institute, East China University of Science and Technology, P.O. Box 368, 130 Meilong Road, Shanghai, China
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  • Zuoxiang Zeng,

    Corresponding author
    1. Chemical Engineering Institute, East China University of Science and Technology, P.O. Box 368, 130 Meilong Road, Shanghai, China
    • Chemical Engineering Institute, East China University of Science and Technology, P.O. Box 368, 130 Meilong Road, Shanghai, China.
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  • Weilan Xue,

    1. Chemical Engineering Institute, East China University of Science and Technology, P.O. Box 368, 130 Meilong Road, Shanghai, China
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  • Juan Zhang

    1. Chemical Engineering Institute, East China University of Science and Technology, P.O. Box 368, 130 Meilong Road, Shanghai, China
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Abstract

The available surface equation of state for pure pulmonary surfactant monolayers is generalised to binary mixture monolayers by introducing a group of parameters, βi(i = 1–4) in the form of equation image to express the influence of the components in new mixing rules and a new factor, Iequation image, is defined to represent the interaction intensity between two different components. The π − A isotherms getting by the surface equations of state agree with the experimental data for protein–lipid binary monolayers, and the average deviation is about 11.41%. The result shows the order of the interaction intensity between protein and lipid is SP-C/DPPG > SP-B/DPPG > SP-C/DPPC > SP-B/DPPC.

L'équation d'état de la surface disponible pour les monocouches de surfactant pulmonaire pures est généralisée en monocouches de mélange binaire en introduisant un groupe de paramètres, βi(i = 1–4) dans une forme qui permet d'exprimer l'influence des composantes dans de nouvelles règles de mélange et un nouveau facteur, I equation image, est défini pour représenter l'intensité de l'interaction entre deux composantes différentes. Les isothermes π − A des équations d'état de la surface concordent avec les données expérimentales pour les monocouches binaires protéines-lipides et la déviation moyenne est d'environ 11,41%. Le résultat démontre que l'ordre de l'intensité de l'interaction entre les protéines et les lipides est SP-C/DPPG > SP-B/DPPG > SP-C/DPPC > SP-B/DPPC. Can. J. Chem. Eng. © 2010 Canadian Society for Chemical Engineering

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