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Volume 2017 (2017), Article ID 6582019, 12 pages
https://doi.org/10.1155/2017/6582019
Research Article

Investigation of Surface Behavior of DPPC and Curcumin in Langmuir Monolayers at the Air-Water Interface

School of Physics and Information Technology, Shaanxi Normal University, Chang’an Street No. 199, Xi’an 710062, China

Correspondence should be addressed to Changchun Hao; nc.ude.unns@nuhcgnahcoah and Runguang Sun; nc.ude.unns@gnaugnurnus

Received 30 June 2017; Revised 25 August 2017; Accepted 11 September 2017; Published 7 November 2017

Academic Editor: Guosong Wu

Copyright © 2017 Guoqing Xu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Langmuir monolayers of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) and a mixture of DPPC with curcumin (CUR) have been investigated at the air-water interface through a combination of surface pressure measurements and atomic force microscopy (AFM) observation. By analyzing the correlation data of mean molecular areas, the compressibility coefficient, and other thermodynamic parameters, we obtained that the interaction between the two components perhaps was mainly governed by the hydrogen bonding between the amino group of DPPC and the hydroxyl groups of CUR. CUR markedly affected the surface compressibility, the thermodynamic stability, and the thermodynamic phase behaviors of mixed monolayers. The interaction between CUR and DPPC was sensitive to the components and the physical states of mixed monolayers under compression. Two-dimensional phase diagrams and interaction energies indicated that DPPC and CUR molecules were miscible in mixed monolayers. AFM images results were in agreement with these analyses results of experimental data. This study will encourage us to further research the application of CUR in the biomedical field.