Normal mode analysis of γ form of oleic acid

Misra, Radha Mohan; Jain, Ashika; Tandon, Poonam; Wartewig, S.; Gupta, V. D.

doi:10.1016/j.chemphyslip.2006.03.002

Cited by 15 publications

(12 citation statements)

References 19 publications

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“…The spectra obtained with excitation of 532 and 1064 nm are similar. As Raman spectra measured with the near IR excitation are reviewed in the literature, here, we focus on the analysis of FA spectra obtained with 532 nm laser line.…”

Section: Resultsmentioning

confidence: 99%

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Raman spectroscopy of lipids: a review

Czamara

Majzner

Pacia

et al. 2014

J Raman Spectroscopy

839

748

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Raman spectra of 35 lipids are presented and analyzed in this work. Selected compounds, i.e. saturated/unsaturated fatty acids, triacylglycerols, cholesterol, cholesteryl esters and phospholipids, were chosen to review key lipids involved in cardiovascular disease development. Differences in Raman signatures both between diverse groups of lipids as well as various members of the same family are investigated in detail in order to elucidate marker features enabling detection and discrimination of lipids in complex samples, particularly of biological origin. This work complements our previous review on important biomolecules, i.e. proteins, and presents a comprehensive database of Raman spectra of naturally occurring lipids. Scheme 1. Chemical structure of chosen fatty acids: saturated (a) and unsaturated (b). Raman spectroscopy of lipids

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Section: Resultsmentioning

confidence: 99%

“…The unsaturated FAs spectra registered using the same parameters have lower S/N ratio and broader bands than the ones registered for saturated FAs. The spectrum of OA in known and that compound is widely used in biological studies using Raman spectroscopy . Raman spectrum of POA has been also published .…”

Section: Resultsmentioning

confidence: 99%

Raman spectroscopy of lipids: a review

Czamara

Majzner

Pacia

et al. 2014

J Raman Spectroscopy

839

748

View full text Add to dashboard Cite

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“…The vibrational features of lipid molecules in solution and in the adsorbed state are compared in Table . Band assignments are based on the literature. ,− When molecules are adsorbed on the hydroxylated Al surface, the C–H stretching region is dominated by the symmetric and asymmetric stretching modes of methylene groups, ν s (CH 2 ) and ν as (CH 2 ), at 2861 and 2931 cm –1 , respectively. The asymmetric stretching mode of CH 3 moieties, ν as (CH 3 ), is also visible at 2966 cm –1 , and the broadening near 2875 cm –1 can be attributed to the corresponding symmetric mode, ν s (CH 3 ).…”

Section: Resultsmentioning

confidence: 99%

Ordered Nanostructures on a Hydroxylated Aluminum Surface through the Self-Assembly of Fatty Acids

et al. 2012

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We investigate the mechanism of self-assembly of fatty acids (FA) and methyl oleate on an Al oxy-hydroxide surface with a view to deciphering the role and nature of interfacial processes (adsorption, chemical binding, molecular organization, etc.). For this purpose, we focus on parameters related to intrinsic properties of molecules, namely the level of unsaturation and the nature of the head group (carboxylic acid or ester). After the FA adsorption, the presence of coordinative bonded carboxylate species on the Al oxy-hydroxide surface is demonstrated by means of PM-IRRAS analysis. We observe that contact of methyl oleate with the surface leads to its chemical transformation through a saponification reaction. As a consequence, it binds to the surface in a manner similar to that for fatty acids. Through an innovative mode of atomic force microscopy (AFM), the organization of the adsorbed molecules is demonstrated. Our results reveal the existence of highly ordered nanostructures guided by the FA self-assembly. The size of these nanostructures was determined with accuracy, suggesting that it exceeds one FA monolayer. By contrast, no organization was observed with methyl oleate.

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“…Thus, a fuller interpretation of IR and Raman spectra demands a re‐look at the vibrational dynamics of TPCP. In continuation of our work on the vibrational dynamics of polymeric systems of natural and industrial importance,12–15 in the present communication we report a complete normal mode analysis using the Urey‐Bradley force field (UBFF)16 as it is more comprehensive than the valence force field. In the UBFF, relatively less parameters are required to express the potential energy and no quadratic cross terms are included in the potential energy expression.…”

Section: Introductionmentioning

confidence: 99%

Immunologic characteristics of intrarenal T cells: Trafficking of expanded CD8+ T cell β‐chain clonotypes in progressive lupus nephritis

Winchester

Wiesendanger

Zhang

et al. 2012

Arthritis & Rheumatism

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Objective To better define the immunologic character of the T cell infiltrate in lupus nephritis. Methods We performed double immunohistochemical staining and clonotypic T cell receptor (TCR) beta-chain sequencing in multiple anatomic regions isolated by laser-capture microdissection from renal biopsies. Results SLE kidneys have a variably patterned and often extensive infiltrate of predominantly clonally expanded T cells of CD4 and CD8 lineages. CD4 T cells were prominent in nearly two-thirds of SLE biopsies, and distributed as broad periglomerular aggregates or intermixed with CD8 T cells forming periglomerular caps. Sequencing of the T cell TCR from periglomerular regions showed a predominance of clonally expanded T cells. The CD8 T cells, which were present in all biopsies, often adhered to Bowman's capsule and infiltrated the tubular epithelium. They exhibited features that suggest participation in an adaptive immune response: differentiation into CD28null memory-effector phenotype, trafficking of the same expanded clonotype to different regions of the kidney and to the peripheral blood, and clonal persistence for years in repeat biopsies. CD8 T cell tubulitis was especially associated with progressive changes. Conclusions The immunological characteristics of the infiltrating CD4 and CD8 T cells in the lupus kidney indicate they have the potential to mediate injury, which may be relevant to development of progressive renal failure. Whereas the oligoclonality of the CD4 T cell infiltrate is consistent with the paradigm of SLE as a class II-associated autoimmune disease, the finding of CD8 T cell clonality and trafficking implies participation in a distinct systemic adaptive immune response.

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Normal mode analysis of γ form of oleic acid

Cited by 15 publications

References 19 publications

Raman spectroscopy of lipids: a review

Raman spectroscopy of lipids: a review

Ordered Nanostructures on a Hydroxylated Aluminum Surface through the Self-Assembly of Fatty Acids

Immunologic characteristics of intrarenal T cells: Trafficking of expanded CD8+ T cell β‐chain clonotypes in progressive lupus nephritis

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