Calcium ion interactions with insoluble phospholipid monolayer films at the A/W interface. External reflection-absorption IR studies

Flach, Carol R.; Brauner, Joseph W.; Mendelsohn, R.

doi:10.1016/s0006-3495(93)81276-1

Cited by 89 publications

(61 citation statements)

References 13 publications

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“…This is mainly due to the lateral interchain interaction between CH 2 groups of adjacent chains, which in general characterizes an orthorhombic arrangement of the CH 2 chains. It is important to mention that this splitting is absent in the monoclinic and triclinic conformation, or even in alkane chain assemblies of low packing density when lateral interchain interactions are weak [8,54]. The splitting of the δ(CH 2 ) band has also been determined in other studies for the CTAB molecule in crystalline phases [45,[49][50][51].…”

Section: Ch 2 Scissoringmentioning

confidence: 62%

“…The CH 2 asymmetric stretching appears at 2917 cm −1 , suggesting a high ordering hydrocarbon chain in all-trans CH 2 configuration [7][8][9]. The band shift from higher 2917 cm −1 to lower frequencies means that the number of gauche conformers decreases and the number of highly ordered all-trans conformers of alkyl chain increases.…”

Section: C-h Stretching Regionmentioning

confidence: 99%

“…Snyder et al [7], Flach et al [8], and Dicko et al [9] show that the frequency of the CH 2 asymmetric stretching feature decreases with the conformational ordering in the hydrocarbon chain of polymers and phospholipids. However, the quantitative correlation between the magnitude of the shifts and the ordering extent has remained obscure and elusive.…”

Section: Introductionmentioning

confidence: 99%

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Infrared Spectroscopy of Anionic, Cationic, and Zwitterionic Surfactants

Viana

Silva

Pimentel

2012

Advances in Physical Chemistry

249

167

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This paper describes the ordering degree of anionic, cationic, and zwitterionic surfactants with the increase of their packing density on Ge substrate by using Fourier transform infrared-attenuated total reflection (FTIR-ATR) spectroscopy. This work shows new insights on the conformational order of sodium dodecyl sulfate (SDS), N-hexadecyl-N-N-dimethyl-3-ammonio-1-propanesulfonate (HPS), hexadecyl-trimethylammonium bromide (CTAB), and dodecyl trimethylammonium bromide (DTAB). DFT and semiempirical calculations are also performed in order to evaluate the effect of headgroup hydration and counterion. The CH 2 asymmetric and symmetric stretching bands for the SDS molecule show a shift of 1.7 and 0.9 cm −1 to higher frequencies as the packing density increases, while it is observed a shift of 2.6 and 2.7 cm −1 for the HPS molecule, respectively. The DTAB molecule shows a shift of 4.5 cm −1 to lower frequencies for both CH 2 asymmetric and symmetric stretching bands as the packing density increases, indicating the decrease of gauche conformations and the increase of all-trans conformations over the aliphatic chain.

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Section: Ch 2 Scissoringmentioning

confidence: 62%

Section: C-h Stretching Regionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Infrared Spectroscopy of Anionic, Cationic, and Zwitterionic Surfactants

Viana

Silva

Pimentel

2012

Advances in Physical Chemistry

249

167

View full text Add to dashboard Cite

show abstract

“…This behavior is probably due to the formation of the rigid H-bond network and is contrary to the previously observed dehydration of phospholipid headgroups upon monolayer compression. 25,26 ■ CONCLUSIONS This study was conducted with the aim of identifying at a molecular scale the structures and specific interactions in monolayers of newly synthesized 1,3-diamidophospholipids. The next step will be the comparison of 2D (monolayers) and 3D (bilayers) structures to understand the ability of forming faceted unilamellar vesicles.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Monolayer Properties of 1,3-Diamidophospholipids

2013

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While nature provides an endless variety of phospholipids presenting hydrolyzable ester linkages for the 1,2-positioned hydrocarbon tails, we designed and synthesized 1,3-diamidophospholipids which contain stable fatty acid amides. These new phospholipids form faceted unilamellar vesicles with mechanosensitive properties. Aiming to understand the mechanism responsible for this behavior at a molecular level, we investigated the 1,3-diamidophospholipid family in monolayers, a simplified model membrane system. Langmuir isotherms combined with in situ grazing incidence X-ray diffraction (GIXD), specular X-ray reflectivity (XR), and infrared reflection−absorption spectroscopy (IRRAS) allowed the characterization of the monolayers from a structural and thermodynamical point of view. The existence of strong headgroup interactions due to the formation of a hydrogen-bonding network was clearly revealed by IRRAS and by the high rigidity of the monolayers. GIXD showed that only the longer chain compounds of the series (Pad-PC-Pad (1,3-dipalmitamidopropan-2-phosphocholine) and Sad-PC-Sad (1,3-distearamidopropan-2-phosphocholine) were able to form ordered monolayers. The chains are strongly tilted in a rigid lattice formed due to these hydrogenbonding interactions between the headgroups. The thermodynamical analysis leads to a critical temperature of the monolayer which is clearly different from the main phase transition temperature in bulk, indicating that there must be a different structural arrangement of the 1,3-diamidophospholipids in monolayers and in bilayers.

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“…Moreover, there is a direct thermodynamic relationship between bilayers and monolayers [126,127]. In addition, a large number of spectroscopic (UV-visible absorption [128][129][130][131][132][133][134], fluorescence [128,[131][132][133][134][135][136], and vibrational [137][138][139][140][141][142][143], (see [120,[144][145][146][147][148][149][150][151][152] for a review)), microscopic (Brewster angle [153,154] and fluorescence [155][156][157], (see [158][159][160][161][162][163][164] for a review)), and different additional physical methods [165][166][167]…”

Section: Monolayers As a Model Membrane To Study Hydrophobic Transmemmentioning

confidence: 99%

Comparison between the behavior of different hydrophobic peptides allowing membrane anchoring of proteins

Lhor¹,

Bernier²,

Horchani³

et al. 2014

Advances in Colloid and Interface Science

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Membrane binding of proteins such as short chain dehydrogenases reductases or tail-anchored proteins relies on their N-and/or C-terminal hydrophobic transmembrane segment. In this review, we propose guidelines to characterize such hydrophobic peptide segments using spectroscopic and biophysical measurements. The secondary structure content of the C-terminal peptides of retinol dehydrogenase 8, RGS9-1 anchor protein, lecithin retinol acyl transferase, and of the N-terminal peptide of retinol dehydrogenase 11 has been deduced by prediction tools from their primary sequence as well as by using infrared or circular dichroism analyses. Depending on the solvent and the solubilization method, significant structural differences were observed, often involving α-helices. The helical structure of these peptides was found to be consistent with their presumed membrane binding. Langmuir monolayers have been used as membrane models to study lipidpeptide interactions. The values of maximum insertion pressure obtained for all peptides using a monolayer of 1,2-dioleoyl-sn-glycero-3-phospho-ethanolamine (DOPE) are larger than the estimated lateral pressure of membranes, thus suggesting that they bind membranes. Polarization modulation infrared reflection absorption spectroscopy has been used to determine the structure and orientation of these peptides in the absence and in the presence of a DOPE monolayer. This lipid induced an increase or a decrease in the organization of the peptide secondary structure. Further measurements are necessary using other lipids to better understand the membrane interactions of these peptides.

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Calcium ion interactions with insoluble phospholipid monolayer films at the A/W interface. External reflection-absorption IR studies

Cited by 89 publications

References 13 publications

Infrared Spectroscopy of Anionic, Cationic, and Zwitterionic Surfactants

Infrared Spectroscopy of Anionic, Cationic, and Zwitterionic Surfactants

Monolayer Properties of 1,3-Diamidophospholipids

Comparison between the behavior of different hydrophobic peptides allowing membrane anchoring of proteins

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