Thermodynamic Characteristics and Direct AFM Observation of Binary Mixtures of PE with Stearic Acid and Octadecanol

Chem. J. Chinese Universities ›› 2010, Vol. 31 ›› Issue (3): 559.

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Thermodynamic Characteristics and Direct AFM Observation of Binary Mixtures of PE with Stearic Acid and Octadecanol

CHANG Yi-Guang, SUN Run-Guang*, HAO Chang-Chun

Laboratory of Biophysics and Biomedical Engineering, College of Physics and Information Technology, Shaanxi Normal University, Xi′an 710062, China

Received:2009-06-26 Online:2010-03-10 Published:2010-03-10
Contact: SUN Run-Guang. E-mail: sunrunguang@snnu.edu.cn
Supported by:
国家自然科学基金(批准号: 20772077)和教育部高等学校博士学科点专项科研基金(批准号: 200807180001)资助.

Abstract

Abstract:

Thermodynamic characteristics of binary mixtures of phosphatidylethanolamine(PE) with stearic acid(SA), and octadecanol(OD) formed at the air/water were investigated in terms of surface pressure(π)-area(A) relation. On the basis of the data, the thermodynamic parameters of compression modulus(C_S^-1), excess mean area per molecule(A_ex), and surface excess Gibbs energy(ΔG_ex) were calculated. We can quantitatively analyze the molecular interactions in the mixed monolayers. The experimental results showed that the various molar ratios of the two components, PE and SA, PE and OD, influenced thermodynamic parameters. The thermodynamic analysis indicated that the thermodynamic parameters[excess molecular area(A_ex), surface excess Gibbs energy(ΔG_ex)] of PE/SA and PE/OD were obtained maximum negative deviation from the ideal behavior at X_SA=0.2, 0.8 and X_OD=0.2, suggesting an attractive interaction between molecules. The other way round, the molar ratios of OD at X_OD=0.2, 0.4, 0.6, were found to be conspicuously maximum positive, suggesting an intermolecular repulsion. The AFM images of mixed PE/SA and PE/OD monolayers are in favor of the theoretic analysis of the thermodynamic characteristics.

Key words: Phosphatidylethanolamine; Monolayer; Compression modulus; Excess Gibbs energy; Atomic force microscopy

TrendMD:

CHANG Yi-Guang, SUN Run-Guang*, HAO Chang-Chun. Thermodynamic Characteristics and Direct AFM Observation of Binary Mixtures of PE with Stearic Acid and Octadecanol[J]. Chem. J. Chinese Universities, 2010, 31(3): 559.

References

[1]Karp G.. Cell and Molecular Biology: Concepts and Experiments, Fourth Ed.[M], New York: Wiley Son, 2004
[2]Katarzyna H. W., Pawel W.. Chem. Phys. Lipids[J], 2007, 150: 22—34
[3]Hao C. C., Sun R. G., Zhang J., et al.. Colloids Surf. B: Biointerfaces[J], 2009, 69: 201—206
[4]CHENG Shi(程时). Physiology(生理科学)[J], 1988, 8(5): 273—277
[5]Blodgett K. B.. Phys. Rev.[J], 1937, 51: 964
[6]HAO Chang-Chun(郝长春), SUN Run-Guang(孙润广), ZHANG Jing(张静). Chem. J. Chinese Universities(高等学校化学学报)[J], 2009, 30(5): 913—918
[7]de la Fuente Feria J., Rodriguez Patino J. M.. Colloids Surf.[J], 1995, 104: 29—40
[8]Yue X., Steffen P., Dobner B., et al.. Colloids Surf. A: Physicochem. Eng. Asp.[J], 2004, 250: 57—65
[9]Perillo M. A., Maestri D. M.. Colloids Surf.: A Physicochem. Eng. Asp.[J], 2005, 256: 199—205
[10]Gambinossi F., Mecheri B., Nocentini M., et al.. Chemist.[J], 2004, 110: 101—117
[11]Zhai X. H., Gerald B., Helmuth M., et al.. Colloids Surf.: A: Physicochem. Eng. Asp.[J], 2005, 256: 51—55
[12]Romao R. I. S., Gonealves da Silva A. M.. Chemistry and Physics of Lipids[J], 2004, 131: 27—39
[13]Dynarowicz-Latka P., Hac-Wydro K.. Colloids Surf. B: Biointerfaces[J], 2004, 37: 21—25
[14]Hiromichi N., Sannamu L., Osamu S.. Biophys. J.[J], 2009, 96: 1415—1429
[15]Barbara G. M., Maria P.. Thin Solid Film[J], 2008, 16: 8865—8872
[16]Davies J. T., Rideal E. K.. Interfacial Phenomena[M], New York: Academic Press, 1963: 265
[17]Dynarowicz A. P., Kita K.. Adv. Colloid Interf. Sci.[J], 1999, 79: 1—17
[18]Katarzyna H. W., Patrycja D. L., Jolanta G., et al.. Thin Solid Film[J], 2008, 516: 1197—1203
[19]Costin I. S., Barnes G. T.. Colloid Interf. Sci.[J], 1975, 51: 106—121
[20]Lee Y. L., Lin J. Y., Chang C. H.. Colloid Interf. Sci.[J], 2006, 296: 647—654
[21]Hao C. C., Sun R. G., Zhang J., et al.. Sci. China, Ser. B: Chemistry[J], 2009, 52(2): 117—248
[22]Gaines G. L.. Insoluble Monolayers at Liquid/Gas Interfaces[M], New York: Wiley-Interscience, 1966

Thermodynamic Characteristics and Direct AFM Observation of Binary Mixtures of PE with Stearic Acid and Octadecanol

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