Glyceryl-Acyl and Aryl-Acyl Dimers in Pseudotsuga menziesii Bark Suberin
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José Graça
Summary
The cork from the outer bark of Douglas-fir (Pseudotsuga menziesii) was exhaustively extracted and submitted to a mild CaO-catalyzed methanolic depolymerization. The solubilized material (2.5 % yield) was derivatized and analysed with GC-MS. Glycerol was the main component (41.2%), followed by aliphatic acid monomers (30.6%) and glyceryl and feruloyl dimers (14.5%). Monoacylglyceryl esters of α,ω-diacids were dominant (68% of glyceryl dimers), followed by monoacylglyceryl esters of alkanoic acids and of ω-hydroxyacids (respectively 20% and 9%). For all cases 1- and 2-monoacyl-glyceryl esters were present. Dimers of ω-hydroxyacids esterified to ferulic acid through their primary hydroxyl were also found. The feruloyl ester of docosanol could also be identified. The relative abundance of the dimers followed the proportion of acid monomers. The direct evidence found here for P. menziesii, and previously for Q. suber, that glycerol is esterified to all suberinic acids and that ω-hydroxyacids are esterified to ferulic acid supported the discussion of a suberin structure developing on glyceryl-diacyl-glyceryl and glyceryl-hydroxyacyl-feruloyl backbones.
Copyright © 1999 by Walter de Gruyter GmbH & Co. KG
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- Literature Reports
Articles in the same Issue
- Estimation of the Relative Proportions of Cellulose I alpha and I beta in Wood by Carbon-13 NMR Spectroscopy
- The Relationship Between Pit Membrane Ultrastructure and Chemical Impregnability of Wood
- The Influence of the Geometrical Distribution of Cell-Wall Tissues on the Transverse Anisotropic Dimensional Changes of Softwood
- On The Permeability of Main Wood Species in China
- Weathering of Radial and Tangential Wood Surfaces of Pine and Spruce
- Removal of Hexavalent Chromium from Dilute Aqueous Solution by Coniferous Leaves
- Performance of Copper and Non-Copper Based Wood Preservatives in Terrestrial Microcosms
- Cooperation of Fungal Laccase and Glucose 1-Oxidase in Transformation of Björkman Lignin and Some Phenolic Compounds
- Micromorphological Characteristics of Compression Wood Degradation in Waterlogged Archaeological Pine Wood
- Induction of Resin Pockets in Seedlings of Pinus sylvestris L. by Mechanical Bending Stress during Growth
- The Lipophilic Extractives of an Interglacial Fossil Picea abies from Zeifen (Germany)
- Glyceryl-Acyl and Aryl-Acyl Dimers in Pseudotsuga menziesii Bark Suberin
- Modified Lignin and Delignification with a CAD-Deficient Loblolly Pine
- Polyhydric Alcohol Pulping at Atmospheric Pressure: An Effective Method for Organosolv Pulping of Softwoods
- Oxygen Delignification of High-Yield Kraft Pulp. Part I: Structural Properties of Residual Lignins
- A New Mechanism in the Ozone Reaction with Lignin Like Structures
- Surface Properties of Mechanical Pulps Prepared under Various Sulfonation Conditions and Preheating Time
- The Mechanisms Behind the Improved Dimensional Stability of Particleboards Made from Steam-Pretreated Particles
- Volatile Organic Chemicals Emissions from OSB as a Function of Processing Parameters
- Literature Reports
