Analysis of aliphatic and phenolic carboxylic acids by capillary supercritical fluid chromatography-Fourier-transform infrared microspectrometry

Structural Analysis of Fatty Acids

“…Four trans,trans-dienes were detected and quantified at low levels, including 9-trans,12-trans-octadecadienoic acid, which may have biological activity. Supercritical fluid chromatography coupled to MI-FI'IR was also applied to the same problem [33] (and was used to study the polymerization of hydroxystearate [166]). In subsequent work, further components were identified by prefractionation of the mixture by silver ion TLC before analysis by GC-MI-FI'IR [142].…”

Chemical transformations of renewable lubricant feedstocks

“…The estolide would continue to cross-link or react linearly at the unreacted -OH and -COOH sites to form a polyestolide. Estolides have been synthesised by homopolymerisation of castor oil FAs [149,150] or 12-hydroxystearic acid [157] under thermal or acid-catalysed conditions. Also the enzymatic production of estolides from HFAs in castor oil (mainly ricinoleic acid or 12-hydroxy-cis-9-octadecenoic acid) has been reported [140,151].…”

Supercritical fluid chromatography and extraction

“…Jinno ana Fujimoto also demonstrated an interface for off-line, solvent elimination FTIR detection in microcolumn LC and SFC (191). Raynor et al investigated the performance of a solvent-elimination interface for open-tubular SFC/FTIR using phenolic carboxylic acids and an oligomeric reaction mixture resulting from the selfcondensation reaction of 12-hydroxystearic acid (192). Norton et al compared spectra obtained by solvent-elimination SFC/FTIR to those in condensed-phase spectral libraries (193).…”