Silviculture and Compression Wood

Timell, T. E.

doi:10.1007/978-3-642-61616-7_16

Cited by 1 publication

(2 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Second, we have simply ignored p -hydroxyphenyl (H) lignin components that are usually minor; we did not detect notable levels by any method (and do report estimates from NMR). Softwoods have only traces of H units in their clearwood, although levels can reach up to 30% in severe compression-wood zones . Hardwoods have typically <2% levels.…”

Section: Resultsmentioning

confidence: 99%

“…Softwoods have only traces of H units in their clearwood, although levels can reach up to 30% in severe compression-wood zones. 48 Hardwoods have typically <2% levels. Grasses are often reported as having higher values but are typically <5% H; values reported to be as high as 30% or more in some literature arise from erroneously ascribing nonmethoxylated phenolics from some analytical methods to H-units when they originate not from p -coumaryl-alcohol-derived units in the core lignin but from pendent p -coumarate units acylating arabinoxylan polysaccharides and lignins.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Lignin Hydrogenolysis: Phenolic Monomers from Lignin and Associated Phenolates across Plant Clades

Chen

et al. 2023

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

The chemical complexity of lignin remains a major challenge for lignin valorization into commodity and fine chemicals. A knowledge of the lignin features that favor its valorization and which plants produce such lignins can be used in plant selection or to engineer them to produce lignins that are more ideally suited for conversion. Sixteen biomass samples were compositionally surveyed by NMR and analytical degradative methods, and the yields of phenolic monomers following hydrogenolytic depolymerization were assessed to elucidate the key determinants controlling the depolymerization. Hardwoods, including those incorporating monolignol p-hydroxybenzoates into their syringyl/guaiacyl copolymeric lignins, produced high monomer yields by hydrogenolysis, whereas grasses incorporating monolignol p-coumarates and ferulates gave lower yields, on a lignin basis. Softwoods, with their more condensed guaiacyl lignins, gave the lowest yields. Lignins with a high syringyl unit content released elevated monomer levels, with a high-syringyl polar transgenic being particularly striking. Herein, we distinguish phenolic monomers resulting from the core lignin vs those from pendent phenolate esters associated with the biomass cell wall, acylating either polysaccharides or lignins. The basis for these observations is rationalized as a means to select or engineer biomass for optimal conversion to worthy phenolic monomers.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%