Chemical brown staining of Douglas-fir wood: characterization of a wood enzyme extract
1997
Laver, M.L. | Musbah, D.A.A.
Solutions containing compounds that possess O-diphenol groups, such as 4-methyl-catechol, (-)-epicatechin, and dihydroquercetin, become discolored when mixed with buffered extracts from Douglas-fir sapwood. This discoloration has been attributed to wood enzymes, which, at least in part, may cause the chemical or enzymatic brown stains that often develop on the surfaces of sawn Douglas-fir lumber. Chemical or enzymatic brown stains have caused financial losses to lumber producers, particularly those producing valuable clear grades of export lumber. This work characterizes the enzyme extracts and shows them to be pH and temperature dependent and active with such substrates as (-)-epicatechin and dihydroquercetin, compounds known to be present in Douglas-fir wood.
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