Über den Abbau von Fichtenholz durch<i>Lenzites saepiaria</i>

Grohn, H.; Deters, W.

doi:10.1515/hfsg.1959.13.1.8

Cited by 10 publications

(2 citation statements)

References 5 publications

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“…Limited Information is available on the chemical structure of · brown-rotted lignin. A decrease in methoxyl content was the first major change observed (Apenitis et al 1951;Grohn and Deters 1959;Pew and Weyna 1962;and Brown et al 1968). Later studies showed that new phenolic hydroxyl groups are present Holzforschung / Vol.…”

Section: Introductionmentioning

confidence: 98%

Structural Characterization of Brown-rotted Lignin

Jin¹,

Schultz²,

Nicholas³

1990

Holzforschung

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Naturally brown-rotted lignin was structurally characterized by various chemical and spectroscopic techniques. Our results of extensively decayed Douglas-fir indicate that modification of lignin by brownrot fungi is mainly oxidative. In addition to modification of aromatic ring structures by demethylation, advanced decay by brown-rot fungi proceeds in the direction of partial depolymerization, perhaps involving aryl ether interunit bond cleavage, and oxidation and cleavage of the lignin side chain structures. Ring and side chain modification results in a significant increase in both phenolic and aliphatic hydroxyl and carboxyl groups, which makes this lignin chemically more reactive. Our results also suggest that aromatic hydroxylation is not involved in the softwood lignin modification by brown-rot fungi. In the course of this work various Isolation procedures for fractionating the lignin into different molecular weight ranges were examined, and it was found that refluxing with hol NaOH is a simple method that may have potential industrial uses.

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Section: Introductionmentioning

confidence: 98%

Structural Characterization of Brown-rotted Lignin

Jin¹,

Schultz²,

Nicholas³

1990

Holzforschung

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“…Adecrease in methoxyl content in brown-rotted lignin (BRL) is the first major observable change (Apenitis et al 1951;Grohn and Deters 1959;Pew and Weyna 1962;and Brown et al 1968). V,!…”

Section: Introductionmentioning

confidence: 99%

Utilization of Lignin Modified by Brown-Rot Fungi. I. Properties of Flakeboard Produced with a Brown-rotted Lignin Modified Phenolic Adhesive

Jin¹,

Sellers²,

Schultz³

et al. 1990

Holzforschung

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KeywordsBrown-rotted lignin (BRL) Brown-rot fungi Brown-rotted Douglas-fir wood Phenolic hydroxyl group . Formaldehyde reactivity Phenol-formaldehyde resin Flakeboard Southern pine SummaryData on an adhesive System for flakeboard is presented in which 35% of the phcnol in a phenol-formaldehyde (PF) resin is replaced with brown-rotted lignin (BRL). This BRL, which has previously been shown to be rieh in phenolic hydroxyl groups, has a higher formaldehyde reactivity than a purified Kraft lignin. Formulation characteristics and molecular weight of the BRL-PFresin were determined and compared with a control PF resin. The physical properties of flakeboard including intcrnal bond (IB), dry static bending (modulus of rupture, MOR), accelerated agingMOR, water absorption and thickncss swelling were examined and found to be comparabie for both adhesivcs.The results of this study demonstratc that BRL can be used äs a partial substitute for phenol in structural wood adhesives.

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Holzkrankheiten und Holzschutz

Zycha¹

1960

Bericht Über Das Jahr 1959

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Über den Abbau von Fichtenholz durchLenzites saepiaria

Cited by 10 publications

References 5 publications

Structural Characterization of Brown-rotted Lignin

Structural Characterization of Brown-rotted Lignin

Utilization of Lignin Modified by Brown-Rot Fungi. I. Properties of Flakeboard Produced with a Brown-rotted Lignin Modified Phenolic Adhesive

Holzkrankheiten und Holzschutz

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