Raman spectroscopy of model membrane monolayers of dipalmitoylphosphatidic acid at the air-water interface using surface enhancement from buoyant thin silver films

Pemberton, Jeanne E.; Chamberlain, James R.

doi:10.1002/(sici)1097-0282(2000)57:2<103::aid-bip7>3.0.co;2-t

Cited by 7 publications

(25 citation statements)

References 99 publications

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“…These Raman modes are associated with the vibration of CH2 groups (particularly C-C stretching; 1062 cm -1 , 1129 cm -1 ), CH2 twisting (1295 cm -1 ) and CH2 bending (1439 cm -1 and 1461 cm -1 ). [2][3][4][5]7 These spectrum were compared with the spectra obtained from the analysis of authentic standard of saturated fatty acids with even-number carbon chain lengths between 12 and 18, fatty alcohols with carbon chain lengths of 16 and 22 as well as with two different species of phospholipids: 1,2-dipalmitoyl-sn-glycero-3-phosphate (DPPA) and 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC). Even-chain species were chosen due to their high-prevalence from biological sources in the ocean biota.…”

Section: Types Of Organic Compounds Identified In Ssa By Ramanmentioning

confidence: 99%

“…Of the natural sources, sea spray aerosol (SSA) and mineral dust are the major contributors of the total global aerosol mass. [4][5][6][7][8] Primary SSA is formed at the air-sea interface upon the rupturing of bubbles entrained from breaking waves. [9][10][11] The ability to better define the radiative effects of primary SSA particles will require that their chemical and physical characteristics, as well as their ability to act as cloud condensation nuclei, be established in more detail.…”

Section: Introductionmentioning

confidence: 99%

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Molecular Diversity of Sea Spray Aerosol Particles: Impact of Ocean Biology on Particle Composition and Hygroscopicity

Cochran

Laskina

Trueblood

et al. 2017

Chem

138

252

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Sea spray aerosol (SSA) particles were found to be diverse with respect to their molecular composition. The number distribution of the SSA particle ensemble, as defined by the molecular signatures in individual particles, shifted in response to changes in the activity of phytoplankton and bacteria in the seawater. This dynamic shift in the molecular composition of individual SSA particles changes their hygroscopicity, a key climate-relevant property. SUMMARYThe impact of sea spray aerosol (SSA) on climate depends on the size and chemical composition of individual particles that make up the total SSA ensemble. There remains a lack of understanding as to the composition of individual particles within the SSA ensemble and how it changes in response to dynamic ocean biology. Here, we characterize the classes of organic compounds as well as specific molecules within individual SSA particles. The diversity of molecules within the organic fraction was observed to vary between submicrometer-and supermicrometer-sized particles and included contributions from fatty acids, monosaccharides, polysaccharides, and siliceous material. Significant changes in this molecular diversity were observed to coincide with the rise and fall of phytoplankton and heterotrophic bacteria populations within the seawater. Furthermore, the water uptake of individual particles was affected, as learned from studying the hygroscopicity of model systems composed of representative mixtures of salts and organic compounds.

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Section: Types Of Organic Compounds Identified In Ssa By Ramanmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Molecular Diversity of Sea Spray Aerosol Particles: Impact of Ocean Biology on Particle Composition and Hygroscopicity

Cochran

Laskina

Trueblood

et al. 2017

Chem

138

252

View full text Add to dashboard Cite

show abstract

“…This provides a high spatial resolution in SERS, which can overcome the optical resolution restricted by the diffraction limit of laser light. 9 Various applications of SERS for the detection of molecules at a solid surface or an air/liquid interface have been performed previously, 10 but only a few measurements have been conducted at a liquid/liquid interface. A liquid/liquid interface is a twodimensional field with different physical and chemical properties from the bulk phases.…”

Section: Introductionmentioning

confidence: 99%

Surface-Enhanced Raman Scattering from Oleate-Stabilized Silver Colloids at a Liquid/Liquid Interface

2004

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Oleate-stabilized silver colloids of 5-nm-diameter were adsorbed to a toluene/water interface, and surface enhanced Raman scattering (SERS) spectra from these colloids were measured under the total internal reflection (TIR) condition. From the observed spectra, we examined the states of oleate ions and toluene molecules on silver colloids at the liquid/liquid interfacial region. The TIR-SERS spectra of oleate ions showed stronger peaks of the carboxylate group and the ethylene group than those of alkyl chains. From these results, it was found that the oleate ions were adsorbed on the silver surface in two different ways at the liquid/liquid interface; the carboxylate group adsorbed in the organic phase side, while the ethylene group adsorbed in the aqueous phase side. The shifts of the toluene in the interfacial SERS spectra were identical to those of bulk toluene, though the relative intensities among the peaks were not same. This result suggested that the toluene was adsorbed with a weak interaction, but was significantly enhanced by the local electromagnetic field at the colloid surface.

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“…33,34 The O–H stretch of water hydrogen-bonded to the lipids also provides also information regarding the structure of hydrated lipids. 35–37…”

Section: Introductionmentioning

confidence: 99%

Multivariate Analysis of Mixed Lipid Aggregate Phase Transitions Monitored Using Raman Spectroscopy

Neal

2017

Appl Spectrosc

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The phase behavior of aqueous 1,2-dimyristoyl-sn-glycero-3-phosphorylcholine (DMPC)/1,2-dihexanoyl-sn-glycero-3-phosphocholine (DHPC) mixtures between 8.0 ℃ and 41.0 ℃ were monitored using Raman spectroscopy. Temperature-dependent Raman matrices were assembled from series of spectra and subjected to multivariate analysis. The consensus of pseudo-rank estimation results is that seven to eight components account for the temperature-dependent changes observed in the spectra. The spectra and temperature response profiles of the mixture components were resolved by applying a variant of the non-negative matrix factorization (NMF) algorithm described by Lee and Seung (1999). The rotational ambiguity of the data matrix was reduced by augmenting the original temperature-dependent spectral matrix with its cumulative counterpart, i.e., the matrix formed by successive integration of the spectra across the temperature index (columns). Successive rounds of constrained NMF were used to isolate component spectra from a significant fluorescence background. Five major components exhibiting varying degrees of gel and liquid crystalline lipid character were resolved. Hydrogen-bonded water networks exhibiting varying degrees of organization are associated with the lipid components. Spectral parameters were computed to compare the chain conformation, packing, and hydration indicated by the resolved spectra. Based on spectral features and relative amounts of the components observed, four components reflect long chain lipid response. The fifth component could reflect the response of the short chain lipid, DHPC, but there were no definitive spectral features confirming this assignment. A minor component of uncertain assignment that exhibits a striking response to the DMPC pre-transition and chain melting transition also was recovered. While none of the spectra resolved exhibit features unequivocally attributable to a specific aggregate morphology or step in the gelation process, the results are consistent with the evolution of mixed phase bicelles (nanodisks) and small amounts of worm-like DMPC/DHPC aggregates, and perhaps DHPC micelles, at low temperature to suspensions of branched and entangled worm-like aggregates above the DMPC gel phase transition and perforated multi-lamellar aggregates at high temperature.

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Raman spectroscopy of model membrane monolayers of dipalmitoylphosphatidic acid at the air-water interface using surface enhancement from buoyant thin silver films

Cited by 7 publications

References 99 publications

Molecular Diversity of Sea Spray Aerosol Particles: Impact of Ocean Biology on Particle Composition and Hygroscopicity

Molecular Diversity of Sea Spray Aerosol Particles: Impact of Ocean Biology on Particle Composition and Hygroscopicity

Surface-Enhanced Raman Scattering from Oleate-Stabilized Silver Colloids at a Liquid/Liquid Interface

Multivariate Analysis of Mixed Lipid Aggregate Phase Transitions Monitored Using Raman Spectroscopy

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