By W. W. Christie
This can be the 3rd quantity of an occasional sequence of books facing features of lipid methodology. The individuals speak about and examine positional isomers of glycerolipids, long-chain acyl-coenzyme A esters, 31P nuclear magnetic resonance profiling of phospholipids and a few vital references in lipid technique.
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Additional info for Advances in Lipid Methodology, Volume 3
Complete separation of the urethane derivatives of racemic monoacylglycerols with C 12 - C 18 saturated fatty chains was achieved using isocratic elution with a mixture of hexane-ethylene ADVANCES IN LIPID METHODOLOGY -THREE 27 dichloride-ethanol (40:12:3 by volume) as the mobile phase. The sn-1-enantiomers were eluted ahead of the corresponding sn-3-enantiomers. Complete separation of the sn-2-isomers from the corresponding enantiomers and partial separation of the enantiomer homologues differing by two acyl carbons was also observed.
Despite taking the usual precautions to avoid high temperatures, to limit exposure to polar, highly acidic or basic solvents, and to perform extractions and TLC separations in the presence of boric acid, some isomerization appeared unavoidable [4,102]. The method of Ando et al.  has been modified recently by Ota et al.  for work with very-long-chain fatty esters. Analysis of synthetic l,3-dioleoyl-2-stearoyl-sn-glycerol by Takagi and Ando  had shown that acyl shifts from sn-2- to the sn-1- and sn-3 positions were less than 3% of the sn-2-acyl group and Takagi  has suggested that increases in the percentage at the sn-1- and sn-3-position should be limited to less than 1%, when the acyl group in the sn-2-position makes up 33%.
Ohrui,H. , Biochem. Biophys. Res. , 168, 506511 (1990). , Ohrui,H. , Biochim. Biophys. Acta, 1168, 253260 (1993). Wedmid,Y. , lipids, 11, 189-193 (1976). ,J. Am. Oil Chem. , 67, 487-494 (1990). ,J. Am. Oil Chem. , 68, 391-400 (1991 ). Yang,L-Y. ,J. , 32, 1173-1186 (1991). , Kuksis,A. J. , 31, 137-147 (1990). , Kuksis,A. ,J. , 36, 1046-1057 (1995). J. , J. , 36, 125-136 (1995). , Lorbeer,E. , Org. , 29, 253-259 (1994). Zollner,F. ,J. , 30, 432-437 (1995). Chapter2 31P NUCLEAR MAGNETIC RESONANCE PROFILING OF PHOSPHOLIPIDS Thomas Glonek1 and Thomas E.
Advances in Lipid Methodology, Volume 3 by W. W. Christie