Investigation of thermal and analytical properties of two nematic liquid crystals by gas chromatography

Berdagué, Philippe; Perez, Felix; Courtieu, Jacques; Bayle, J. P.; Abdelhadi, Ousama M.; Guermouche, S.; Guermouche, M. H.

doi:10.1007/bf02290272

Cited by 24 publications

(7 citation statements)

References 26 publications

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“…Arachidonic acid, 5,8,11,14-eicosatetraynoic acid (ETYA), calcium ionophore A23187, nordihydroguaiaretic acid (NDGA), phosphate buffered saline tablets (Sigma); EDTA-Na2, DMSO, (NH4)2HPO4, acetonitrile and methanol HPLC grade (Merck); octadecyl endcapped reversed-phase solid phase extraction columns 500 mg, 6 ml (Baker); HPLC column 300/4 Nucleosil 100-10 C18 (Macherey & Nagel); buffy coat obtained from the combined blood of several donors (Institut für Transfusionsmedizin, University of Münster); AR-C73346XX [7] and 3-dodecyloxybenzoic acid [8] were synthesized according to the published procedures.…”

Section: Methodsmentioning

confidence: 99%

Comparison of the Inhibition of the Cytosolic Phospholipase A2-Mediated Arachidonic Acid Release by Several Indole-2-carboxylic Acids and 3-(Pyrrol-2-yl)propionic Acids in Bovine and in Human Platelets

Lehr¹,

Elfringhoff²

2000

Arch. Pharm. Pharm. Med. Chem.

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Section: Methodsmentioning

confidence: 99%

Comparison of the Inhibition of the Cytosolic Phospholipase A2-Mediated Arachidonic Acid Release by Several Indole-2-carboxylic Acids and 3-(Pyrrol-2-yl)propionic Acids in Bovine and in Human Platelets

Lehr¹,

Elfringhoff²

2000

Arch. Pharm. Pharm. Med. Chem.

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“…Influence of Lateral Alkoxy Chain Length on the GC Properties of Liquid Crystals Chromatographic behavior of the five liquid crystals is comparable in the separation of volatile aroma isomers (Table 3) [18,19]. The five liquid crystals completely separate the two compounds (see Table 3).…”

Section: Comparative Analytical Applications Of Aln Compoundsmentioning

confidence: 97%

“…(n-nonane for the solid, n-octadecane for the nematic phase, anthracene for the liquid). The columns exhibit a remarkably high efficiency, probably due to the liquid crystals molecular structures and also to the way in which the capillary have been etched, deactivated and coated [ 18,191. The five liquid crystals present interesting analytical capabilities in the solid state, nematic, or liquid phase:…”

Section: Comparative Analytical Applications Of Aln Compoundsmentioning

confidence: 99%

Influence of the lateral alkoxy chain length on the gas chromatographic properties of five liquid crystals

Perez

Berdagué

Courtieu

et al. 1997

J. High Resol. Chromatogr.

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SummaryThe gas chromatographic properties of five laterally substituted liquid crystals are the subject of a comparative study. These liquid crystals belong to the homologous series: 2-alkoxy-3-methyl-4-(4-ethoxybenzoyl-oxy)-4'-(4-trans-n-pentylcyclohexanecarboxyloxy) azobenzene, referred to as ALn, where n , the carbon number in the lateral alkoxy chain, is equal to 4,6,8,10, or 12 carbon atoms. Their thermal properties were established by differential scanning calorimetry (DSC). It appears that the introduction of a lateral alkoxy chain affects the nematic temperature range which decreases when the carbon number increases. The chromatographic separation abilities of AL4, AL6, AL8, AL10, and AL12 were studied using capillary glass columns. The five liquid crystals are efficient before and after solid-nematic or nematic-liquid transitions; however, the plate numbers are higher in the nematic state. Interesting analytical properties were noted in various fields: isomeric separation of alkanes, aromatics, polyaromatics, volatile aroma compounds, and cis and trans isomers. However, the chain length does not exert any great influence on the separation abilities.

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“…Their exceptional behavior allowed their application in the analysis of numerous mixtures of components. Such applications towards the separation of isomeric phenols, naphthalene homologs, polycyclic aromatic hydrocarbons, di-substituted benzenes, and volatile oil constituents [12][13][14][15][16] have been widely investigated.…”

Section: Introductionmentioning

confidence: 99%

Historical Development of Liquid Crystalline Stationary Phases: An Overview

Ghanem¹

2015

AJAC

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Abstract:Nematic liquid crystals have shown particular selectivity and sensitivity as stationary phases for the separation of isomers having similar volatilities. Because of their unique selectivity towards rigid solute isomers, liquid crystal stationary phases were considered at one time to be a very promising class of materials that give the gas chromatographic separations a great deal of attention. In this overview, we present a brief historical view of the liquid crystal stationary phases development, which were successfully used in gas chromatography for separation of isomers.

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Investigation of thermal and analytical properties of two nematic liquid crystals by gas chromatography

Cited by 24 publications

References 26 publications

Comparison of the Inhibition of the Cytosolic Phospholipase A2-Mediated Arachidonic Acid Release by Several Indole-2-carboxylic Acids and 3-(Pyrrol-2-yl)propionic Acids in Bovine and in Human Platelets

Comparison of the Inhibition of the Cytosolic Phospholipase A2-Mediated Arachidonic Acid Release by Several Indole-2-carboxylic Acids and 3-(Pyrrol-2-yl)propionic Acids in Bovine and in Human Platelets

Influence of the lateral alkoxy chain length on the gas chromatographic properties of five liquid crystals

Historical Development of Liquid Crystalline Stationary Phases: An Overview

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