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Methanolysis of Bark Suberins: Analysis of Glycerol and Acid Monomers by José Graça; Helena Pereira is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

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The depolymerization and subsequent analysis of cork suberins from the outer barks of Pseudotsuga menziesii and Quercus suber was performed using a simplified methanolysis procedure. The amount of sodium methoxide catalyst was maintained at 20-30 mM and the methanolysis mixture was submitted to trimethylsilyl derivatisation and used directly for gas chromatographic analysis, allowing simultaneous quantification of glycerol and long-chain monomers. Response factors for glycerol, ferulic acid and one saturated homologue representing each of the suberinic families (i.e. the 1-alkanols, 1-alkanoic acids, vhydroxyacids and a,v-diacids) were determined. Effective depolymerization of suberin was checked using the infrared specta of the residues after methanolysis. Glycerol is a major constituent of the suberins from P. menziesii (26% of total) and from Q. suber (14%). In both suberins, a,v-diacids are dominant, i.e. 54% of the long-chain monomers in P. menziesii (mostly saturated C16-C22 homologues and the C18 unsaturated diacid), and 53% in Q. suber (mostly the C18 unsaturated diacid and mid-chain oxygenated (epoxide and vic-diol) derivatives). In P. menziesii epoxyacids are absent. The

Who reads Methanolysis of Bark Suberins: Analysis of Glycerol and Acid Monomers?

Author

José Graça; Helena Pereira

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0958-0344)

Published

2000

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)