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Titolo:
On the interaction of dipalmitoyl phosphatidylcholine with normal long-chain alcohols in a mixed monolayer: a thermodynamic study
Autore:
Chen, KB; Chang, CH; Yang, YM; Maa, JR;
Indirizzi:
Natl Cheng Kung Univ, Dept Chem Engn, Tainan 70101, Taiwan Natl Cheng KungUniv Tainan Taiwan 70101 Chem Engn, Tainan 70101, Taiwan
Titolo Testata:
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
fascicolo: 2-3, volume: 170, anno: 2000,
pagine: 199 - 208
SICI:
0927-7757(20000930)170:2-3<199:OTIODP>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
AIR-WATER-INTERFACE; AQUEOUS NACL SOLUTION; AIR/WATER INTERFACE; PH 1.2; CHOLESTEROL; FILMS; MISCIBILITY; ACID; 25-DEGREES-C; SURFACTANT;
Keywords:
air/water interface; mixed monolayer; molecular interaction; monolayer miscibility; surface pressure-area isotherm;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Chang, CH Natl Cheng Kung Univ, Dept Chem Engn, Tainan 70101, Taiwan Natl Cheng Kung Univ Tainan Taiwan 70101 Tainan 70101, Taiwan
Citazione:
K.B. Chen et al., "On the interaction of dipalmitoyl phosphatidylcholine with normal long-chain alcohols in a mixed monolayer: a thermodynamic study", COLL SURF A, 170(2-3), 2000, pp. 199-208

Abstract

This study investigated the mixed monolayer behavior of dipalmitoyl phosphatidylcholine (DPPC) with normal long-chain alcohols at the air/water interface. Surface pressure-area isotherms of mixed DPPC/C18OH and DPPC/ C20OH monolayers at 37 degrees C were obtained and compared with previous results for the mixed DPPC/C16OH system. The negative deviations from additivity ofthe areas and the variation of the collapse pressure with composition imply that DPPC and long-chain alcohols were miscible and formed non-ideal monolayers at the interface. At lower surface pressures, it seems that the attractive intermolecular force was dominant in molecular packing in the mixed monolayers. At higher surface pressures, the data suggest that the molecular packing in mixed DPPC/C16OH monolayers may be favored by the packing efficiency or geometric accommodation. Furthermore, negative values of excess free energy of mixing were obtained and became significant as the hydrocarbon chain length of alcohols increased, which indicates there were attractiveinteractions between DPPC and long-chain alcohols. In each free energy of mixing-composition curve, there was only one minimum and thus a phase separation did not exist for mixed DPPC/long-chain alcohol monolayers. (C) 2000 Elsevier Science B.V. All rights reserved.

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Documento generato il 07/07/20 alle ore 22:06:28