Monolayer characteristics of saturated 1,2-diacyl phosphatidylcholines (lecithins) and phosphatidylethanolamines at the air-water interface

Phillips, Michael C.; Chapman, D.

doi:10.1016/0005-2736(68)90115-6

Cited by 573 publications

(266 citation statements)

References 24 publications

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“…The isotherm of DPPC on pure water reveals distinct phases that have been previously identified. [32] Four phases of DPPC monolayer on pure water can be observed: a gas phase (G, .105 Å 2 /molecule), a liquid-expanded phase (LE, 75-105 Å 2 /molecule), a liquid-condensed phase (LC, ,55 Å 2 /molecule), and a typical LE-LC transition phase (LE-LC, 55-75 Å 2 /molecule) defined by a plateau at ,13 mN/ m, which is in agreement with the literature. [19] The DPPC monolayer on pure water collapsed at 45 Å 2 /molecule and 55 mN/m, following a sharp surface-pressure increase.…”

Section: Resultsmentioning

confidence: 99%

Impact of anions on the surface organisation of lipid monolayers at the air–water interface

Wang

2017

Environ. Chem.

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Environmental context. Lipids released from lysis of phytoplankton cells are enriched in the sea surface microlayer. Such surface-active organics can be transferred through bursting bubbles to sea-spray aerosols where they can influence atmospheric chemistry. The results presented here suggest that phospholipids combine more readily with SO 4 2À than with Br À , leading to enrichment of organic-coated sulfate salts in marine aerosols.Abstract. Inorganic salts and organic matter are known to be present at higher levels in the sea surface microlayer and marine aerosols; however, the impact of common anions on their surface properties is not well understood. Here, a 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) monolayer was enriched with the sodium and ammonium salts of different anions (Br À , Cl À , NO 3 À , SO 4 2À , CH 3 COO À , and HCO 3 À ), and the effects on the surface properties of the monolayer were investigated. The monolayer phase behaviour and the structure of the lipid phases were studied by surface pressure-area (p-A) isotherms and infrared reflection-absorption spectroscopy (IRRAS). The presence of salts in the subphase was found to increase the surface pressure of the DPPC monolayer at a fixed area per molecule. The effect of the anions follows the order of the Hofmeister series. The higher concentration of salt solution caused the p-A isotherm to shift to larger area. The IRRAS spectra demonstrate that the ordering of the DPPC molecules in the liquid condensed phase remains essentially unaffected, even at higher electrolyte concentrations. DPPC molecules combined with SO 4 2À could be transferred from the ocean to sea spray aerosol. The present study finds that the anions have significant influence on the surface organisation and, consequently, the interfacial properties, of the surface-active species at the air-water interface, a finding that has further implications for atmospheric aerosol nucleation.

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Section: Resultsmentioning

confidence: 99%

Impact of anions on the surface organisation of lipid monolayers at the air–water interface

Wang

2017

Environ. Chem.

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“…Moreover, the existence of a dynamic phase equilibrium of lipid molecules, going from the gel to the liquid crystalline state or vice versa, may be important in the formation of the pores. As the transition of the lipid molecules from the liquid crystalline to the gel state is accompanied by a decrease in the area per molecule [1,2,25] the extent of the decrease and the cooperativity of the system may influence the size of the pore. The significance of the decrease in area per molecule resulting from a liquid crystalline to gel transition has been discussed earlier by Linden et al [26].…”

Section: Discussionmentioning

confidence: 99%

The effect of chain length and lipid phase transitions on the selective permeability properties of liposomes

Blok

Neut-Kok

Deenen

et al. 1975

Biochimica et Biophysica Acta (BBA) - Biomembranes

279

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“…DPPC and DMPE, films in which the transition occurs at equal pressures, shows that the decrease in area is considerably less for DMPE [30]. However, at equal temperature the transitions of comparable species of the two phospholipid classes occur at quite different pressures.…”

Section: (6a/811)t C=---xmentioning

confidence: 92%

Comparative study on the properties of saturated phosphatidylethanolamine and phosphatidylcholine bilayers: Barrier characteristics and susceptibility to phospholipase A2 degradation

Noordam

Killian

Elferink

et al. 1982

Chemistry and Physics of Lipids

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Comparative studies on bilayer systems of saturated phosphatidylcholines and phosphatidylethanolamines revealed a maximum in ionic permeability in phosphatidylcholine bilayers at the temperature of the gel to liquid-crystalline phase transition but such an increase in permeability was not detectable in bilayers of phosphatidylethanolamine. Furthermore, it was found that at the phase transition temperature the phosphatidyicholine bilayers are subject to rapid hydrolysis by pancreatic phospholipase A2 whereas phosphatidylethanolamine bilayers are not. These differences are discussed in view of detailed information on the molecular organization in the gel and liquid crystalline phases of the two phospholipid classes.

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Monolayer characteristics of saturated 1,2-diacyl phosphatidylcholines (lecithins) and phosphatidylethanolamines at the air-water interface

Cited by 573 publications

References 24 publications

Impact of anions on the surface organisation of lipid monolayers at the air–water interface

Impact of anions on the surface organisation of lipid monolayers at the air–water interface

The effect of chain length and lipid phase transitions on the selective permeability properties of liposomes

Comparative study on the properties of saturated phosphatidylethanolamine and phosphatidylcholine bilayers: Barrier characteristics and susceptibility to phospholipase A2 degradation

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