Structural properties and Raman spectroscopy of lipid Langmuir monolayers at the air–water interface

Dai, Shuxi; Zhang, Xingtang; Du, Zuliang; Huang, Yabin; Dang, Hongyue

doi:10.1016/j.colsurfb.2004.12.021

Cited by 28 publications

(12 citation statements)

References 35 publications

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“…2(d) and (e), we can also distinguish a weakly enhanced band (at about 1650 cm 1 ), which can be attributed to the CO streching vibrations of the hydrogen bonded COOH groups. Increasing the number of dissociated carboxylic groups with concomitant rearrangement of the thiol monolayer also results in a shift of the wavenumber characteristic for antisymmetric stretching vibration of the COO groups from around 1575-1580 cm 1 to around 1590 cm 1 (Figs 4 and 5). 2(a)), where we expect a dimeric structure of the thiol.…”

Section: Structure Of Msa Monolayermentioning

confidence: 93%

Self‐assembled monolayers of mercaptosuccinic acid on silver and gold surfaces designed for protein binding. Part I: structure of the monolayer

Królikowska¹,

Bukowska²

2007

J Raman Spectroscopy

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Structure of the monolayers of mercaptosuccinic acid (MSA) on silver and gold electrodes, grown from aqueous solution, has been studied using surface enhanced Raman scattering (SERS) spectroscopy. It was found that MSA chemisorbs via both sulfur atom and one carboxylic group (more close to the sulfur atom) dissociated on the Ag and Au at natural pH (slightly acidic). The influence of the type of the substrate, pH of the solution and time of incubation of the thiol monolayer have been investigated. SERS results show that acidity of one carboxylic group of MSA (more close to the sulfur) decreases on both substrates with simultaneous increase of acidity of the second COOH group, in comparison to the solution. For silver substrate, longer time of incubation is necessary to form a stable monolayer, whereas the structure of monolayer on gold does not exhibit temporal evolution.

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Section: Structure Of Msa Monolayermentioning

confidence: 93%

Self‐assembled monolayers of mercaptosuccinic acid on silver and gold surfaces designed for protein binding. Part I: structure of the monolayer

Królikowska¹,

Bukowska²

2007

J Raman Spectroscopy

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“…The bands observed around 1060 cm −1 and 1130 cm −1 are characteristic of trans-bonded carbon and the band observed around 1100 cm −1 denotes the vibration of a gauche-bonded chain. The analysis of the spectra obtained for these LPA samples compared well to Raman spectra of various lipids that have been previously analyzed [21][22][23][24]. Very strong similarities between the spectra of these two LPA molecules are noted, in particular the 889 cm −1 , 1294 cm −1 , 1060 cm −1 , and 1128 cm −1 bands that they commonly share.…”

Section: Resultsmentioning

confidence: 86%

Surface-enhanced Raman scattering detection of lysophosphatidic acid

2005

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Surface-enhanced Raman scattering using silver nanoparticles was applied to detect various forms of lysophosphatidic acid (LPA) to examine its potential application as an alternative to current detection methods of LPA as biomarkers of ovarian cancer. Enhancement of the Raman modes of the molecule, especially those related to the acyl chain within the 800-1300 cm −1 region, was observed. In particular, the C-C vibration mode of the gauche-bonded chain around 1100 cm −1 was enhanced to allow the discrimination of two similar LPA molecules. Given the molecular selectivity of this technique, the detection of LPA using SERS may eliminate the need for partial purification of samples prior to analysis in cancer screening.

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“…Control ZnO particles show a peak around 1650 cm -1 corresponding to carbonyl stretching frequency that is overlapped with the chitosan peak in the chitosan-coated ZnO nano-rod composites. The major change seen in N-H stretching (1585 cm -1 ) (Kumirska et al 2010) and -CH 2 twisting and bending [1294 cm -1 (Dai et al 2005); 1251 cm -1 ] indicates the interaction of ZnO with N-H group as well as aliphatic part of chitosan. Observed shifts of N-H and C-H stretching as seen with CS-coated ZnO nano-rod may be due to interactions of ZnO with -NH/-CH of CS.…”

Section: Ftir Studymentioning

confidence: 98%

Monitoring of ppm level humic acid in surface water using ZnO–chitosan nano-composite as fluorescence probe

Basumallick

Santra

2015

Appl Water Sci

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Surface water contains natural pollutants humic acid (HA) and fulvic acid at ppm level which form carcinogenic chloro-compounds during chlorination in water treatment plants. We report here synthesis of ZnO-chitosan (CS) nano-composites by simple hydrothermal technique and examined their application potential as fluorescent probe for monitoring ppm level HA. These ZnO-CS composites have been characterized by HRTEM, EDX, FTIR, AFM and Fluorescence Spectra. HRTEM images show the formation of ZnO-CS nano-composites of average diameter of 50-250 nm. Aqueous dispersions of these nano-composites show fluorescence emission at 395 nm when excited at 300 nm which is strongly quenched by ppm level HA indicating their possible use in monitoring ppm level HA present in surface water.

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Structural properties and Raman spectroscopy of lipid Langmuir monolayers at the air–water interface

Cited by 28 publications

References 35 publications

Self‐assembled monolayers of mercaptosuccinic acid on silver and gold surfaces designed for protein binding. Part I: structure of the monolayer

Self‐assembled monolayers of mercaptosuccinic acid on silver and gold surfaces designed for protein binding. Part I: structure of the monolayer

Surface-enhanced Raman scattering detection of lysophosphatidic acid

Monitoring of ppm level humic acid in surface water using ZnO–chitosan nano-composite as fluorescence probe

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