Glycerol-derived ester oligomers from cork suberin

Area of Science:

• Plant biochemistry
• Polymer chemistry
• Lipidomics

Background:

• Cork suberin is a complex plant biopolymer.
• Its exact polymeric structure and monomeric composition remain areas of active research.
• Understanding suberin's structure is crucial for its potential applications.

Purpose of the Study:

• To partially depolymerize cork suberin.
• To identify the monomeric and oligomeric components released.
• To elucidate the polymeric nature of suberin.

Main Methods:

• Partial depolymerization of cork suberin using methanolysis.
• Methanolysis catalyzed by calcium hydroxide.
• Analysis of the methanolisate using electrospray ionization tandem mass spectrometry (ESI-MS/MS) with lithium adducts.

Main Results:

• The reaction solubilized a mixture of monomers and oligomers.
• Glycerol-derived dimeric and trimeric esters were identified.
• Specific glycerol esters identified include monoacylglycerols, diglycerol diesters, and diacylglycerols, incorporating various diacids and hydroxyacids.
• The identified alpha,omega-diacids and omega-hydroxyacids correspond to known suberin monomers.

Conclusions:

• Suberin is a polymeric lipid derived from glycerol.
• The identified components confirm suberin's complex esterified structure.
• Suberin shares characteristics with glycerolipids found in biological membranes, suggesting related functional roles.