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Cork from Douglas-fir bark (Pseudotsuga menziesii) was separated, extracted and submitted to suberin depolymerization by transesterification with sodium methoxide in methanol. As a result a saponified cork fraction (cork sap ) with a yield of 19% was obtained. From cork sap a milled cork lignin (MCL sap ) was isolated using the Björkman procedure with a yield of 0.75% (based...
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