Quercus suber and Betula pendula outer barks as renewable sources of oleochemicals: A comparative study

Abstract A comparative study on the chemical composition of oak cork ( Quercus suber L.) and corresponding industrial residues and birch ( Betula pendula L.) outer bark is reported. Cork oak samples have lower extractives contents (6–9%) and higher contents of carbohydrates and lignin (23–27 and 33–38%, respectively) than those found for birch outer bark (40, 6 and 9%, respectively); suberin contents accounted for around 30% of cork, 11% of industrial cork powder and 45% of birch outer bark. Analysis of the suberin monomeric composition revealed that C18 and C22 ω-hydroxyfatty acids (including mid-chain epoxy- and dihydroxy-derivatives), followed by α,ω-dicarboxylic acids, are the main components in both suberins, with 9,10-epoxy-18-hydroxyoctadecanoic, 18-hydroxyoctadec-9-enoic, 9,10,18-trihydroxyoctadecanoic and octadec-9-enoic acids as the major components. The differences in the relative amounts of these acids in the suberin samples and the impact on the potential exploitation of the different industrial by-products are discussed.

[1]  B. Kamm,et al.  Principles of biorefineries , 2004, Applied Microbiology and Biotechnology.

[2]  H. Pereira,et al.  Chemical composition and variability of cork from Quercus suber L. , 1988, Wood Science and Technology.

[3]  Amparo Asensio,et al.  Structural studies of a hemicellulose B fraction from the cork of Quercus suber , 1987 .

[4]  Birgit Kamm,et al.  Biorefineries – Industrial Processes and Products , 2005 .

[5]  Anna Sundheq,et al.  Determination of hemicelluloses and pectins in wood and pulp fibres by acid methanolysis and gas chromatography , 1996 .

[6]  B. Sanwal,et al.  MODERN METHODS OF PLANT ANALYSIS , 1955 .

[7]  A. Gandini,et al.  Urethanes and polyurethanes from suberin 2: synthesis and characterization , 1999 .

[8]  M. Lindström,et al.  Lipase-catalyzed synthesis of an epoxy-functionalized polyester from the suberin monomer cis-9,10-epoxy-18-hydroxyoctadecanoic acid. , 2007, Biomacromolecules.

[9]  D. Evtuguin,et al.  Structure of hardwood glucuronoxylans : modifications and impact on pulp retention during wood kraft pulping , 2005 .

[10]  A. Gandini,et al.  Oxypropylation of cork and the use of the ensuing polyols in polyurethane formulations. , 2002, Biomacromolecules.

[11]  E. Conde,et al.  Chemical Characterization of Reproduction Cork from Spanish Quercus Suber , 1998 .

[12]  Rui L. Reis,et al.  Cork: properties, capabilities and applications , 2005 .

[13]  A. Gandini,et al.  Cork suberin as a new source of chemicals. 1. Isolation and chemical characterization of its composition. , 1998, International journal of biological macromolecules.

[14]  E. W. Tegelaar,et al.  Chemical characterization of the periderm tissue of some angiosperm species: recognition of an insoluble, non-hydrolyzable, aliphatic biomacromolecule (Suberan) , 1995 .

[15]  E. Cadahía,et al.  Variability of Suberin Composition of Reproduction Cork from Quercus suber Throughout Industrial Processing , 1999 .

[16]  Amparo Asensio.  Structural studies of the hemicellulose A from the cork of Quercus suber , 1987 .

[17]  I. Delgadillo,et al.  Isolation and Analysis of Cell Wall Polymers from Olive Pulp , 1996 .

[18]  S. Ring,et al.  Determination of aldoses and uronic acid content of vegetable fiber. , 1979, Analytical biochemistry.

[19]  A. Gandini,et al.  Urethanes and polyurethanes from suberin: 1. Kinetic study , 1997 .

[20]  R. Ekman.  The Suberin Monomers and Triterpenoids from the Outer Bark of Betula verrucosa Ehrh. , 1983 .

[21]  Armando J. D. Silvestre,et al.  Suberin: A promising renewable resource for novel macromolecular materials , 2006 .

[22]  P. Pinto,et al.  Triterpenic and other lipophilic components from industrial cork byproducts. , 2006, Journal of agricultural and food chemistry.

[23]  A. M. Gil,et al.  Composition of suberin extracted upon gradual alkaline methanolysis of Quercus suber L. cork. , 2000, Journal of agricultural and food chemistry.

[24]  S. Adhikari,et al.  Biorefineries: Current Status, Challenges, and Future Direction , 2006 .

[25]  A. Gandini,et al.  Urethanes and polyurethanes based on oxypropylated cork: 1. Appraisal and reactivity of products , 2001 .

[26]  Helena Pereira,et al.  Quantitative Analysis of Cork (Quercus suber L.) and Milled Cork Lignin by FTIR Spectroscopy, Analytical Pyrolysis, and Total Hydrolysis , 1994 .

[27]  A. Gandini,et al.  The oxypropylation of cork residues: preliminary results , 2000 .