Isolation and comparative characterization of a Björkman lignin from the saponified cork of Douglas-fir bark

Marques, António Vélez; Pereira, Helena; Rodrigues, José Carlos; Meier, Dietrich; Faix, O.

doi:10.1016/j.jaap.2006.03.003

Cited by 40 publications

(28 citation statements)

References 53 publications

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“…1. In accordance to Faix classification [41,43], the FTIR spectrum of the untreated HL (Fig. 1A) indicates the presence of syringyl units: the absence of a maximum at 1140 cm À1 , close intensities of the bands at 1510 and 1463 cm À1 , and 1270 and 1220 cm À1 , rather strong intensity of the band at 1330 cm À1 (C1-O vibration in syringyl units).…”

Section: Characterization Of Lignin Samples Incubated In Soil By Funcsupporting

confidence: 74%

Characterization of the transformations of lignocellulosic structures upon degradation in planted soil

Телышева

Dobele

Meier³

et al. 2007

Journal of Analytical and Applied Pyrolysis

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Section: Characterization Of Lignin Samples Incubated In Soil By Funcsupporting

confidence: 74%

Characterization of the transformations of lignocellulosic structures upon degradation in planted soil

Телышева

Dobele

Meier³

et al. 2007

Journal of Analytical and Applied Pyrolysis

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“…S/G lignin ratios have proven to be important parameters for gauging the recalcitrance of lignin, although no clear trend has been established as to whether or not a high S content results in increased monomeric sugar release following an enzymatic hydrolysis. The traditional methods for measuring lignin monomer composition include NMR, pyGCMS, pyMBMS, and various wet chemical methods such as nitrobenzene oxidation (NBO) and thioacidolysis [4,5,13,56,58,59,[61][62][63][64][65][66]68,70,126,135,157,159,183,240,242,[291][292][293][294][295][296][297][298][299][300][301][302][303][304][305][306][307]. Common pyrolysis and mass spectral fragments are listed in Table 8, and illustrated in Fig.…”

Section: Lignin Monomer Compositionmentioning

confidence: 99%

“…Thermochemical evaluations of lignin monomers have become increasing prevalent [4,5,13,59,[61][62][63][64][65][66]68,70,126,157,159,183,240,242,293,295,[298][299][300][301]303,305,306,308]. When heated, lignin linkages are cleaved, permitting the identification of individual monomeric moieties.…”

Section: Pyrolysismentioning

confidence: 99%

Recent innovations in analytical methods for the qualitative and quantitative assessment of lignin

Lupoi

Singh

Parthasarathi

et al. 2015

Renewable and Sustainable Energy Reviews

297

197

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a b s t r a c tAs the attraction of creating biofuels and bio-based chemicals from lignocellulosic biomass has increased, researchers have been challenged with developing a better understanding of lignin structure, quantity and potential uses. Lignin has frequently been considered a waste-product from the deconstruction of plant cell walls, in attempts to isolate polysaccharides that can be hydrolyzed and fermented into fuel or other valuable commodities. In order to develop useful applications for lignin, accurate analytical instrumentation and methodologies are required to qualitatively and quantitatively assess, for example, what the structure of lignin looks like or how much lignin comprises a specific feedstock's cellular composition. During the past decade, various diverse strategies have been employed to elucidate the structure and composition of lignin. These techniques include using two-dimensional nuclear magnetic resonance to resolve overlapping spectral data, measuring biomass with vibrational spectroscopy to enable modeling of lignin content or monomeric ratios, methods to probe and quantify the linkages between lignin and polysaccharides, or refinements of established methods to provide higher throughput analyses, less use of consumables, etc. This review seeks to provide a comprehensive overview of many of the advancements achieved in evaluating key lignin attributes. Emphasis is placed on research endeavored in the last decade.

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“…Lignin is usually defined as a polymer of phenylpropane units with three different aromatic units-p-hydroxyphenyl (H), guaiacyl (G), and syringyl (S)-and the lignins are classified according to their H/G/S ratios. Lignin structural composition of barks, namely of corks, is largely unknown except for a few cases that showed that cork lignin is composed mainly of guaiacyl units with a low proportion of syringyl units (Marques et al, 1994(Marques et al, , 1996(Marques et al, , 1999(Marques et al, , 2006(Marques et al, , 2016Marques and Pereira, 2013).…”

Section: Cork Structure and Chemical Compositionmentioning

confidence: 99%

“…Cork lignin is a G-type lignin composed by 95% guaiacyl units, 3% syringyl units, and 2% 4-hydroxyphenyl units (Marques et al, 2006;Marques and Pereira, 2013) with 80% of the inter-unit linkages as β-O-4-alkyl-aryl ether bond (Marques et al, 2016).…”

Section: Chemical Compositionmentioning

confidence: 99%

Cork-Containing Barks—A Review

Leite

Pereira

2017

Front. Mater.

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Tree barks are among the less studied forest products notwithstanding their relevant physiological and protective role in tree functioning. The large diversity in structure and chemical composition of barks makes them a particularly interesting potential source of chemicals and bioproducts, at present valued in the context of biorefineries. One of the valuable components of barks is cork (phellem in anatomy) due to a rather unique set of properties and composition. Cork from the cork oak (Quercus suber) has been extensively studied, mostly because of its economic importance and worldwide utilization of cork products. However, several other species have barks with substantial cork amounts that may constitute additional resources for cork-based bioproducts. This paper makes a review of the tree species that have barks with significant proportion of cork and on the available information regarding the structural and chemical characterization of their bark. A general integrative appraisal of the formation and types of barks and of cork development is also given. The knowledge gaps and the potential interesting research lines are identified and discussed, as well as the utilization perspectives.

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Isolation and comparative characterization of a Björkman lignin from the saponified cork of Douglas-fir bark

Cited by 40 publications

References 53 publications

Characterization of the transformations of lignocellulosic structures upon degradation in planted soil

Characterization of the transformations of lignocellulosic structures upon degradation in planted soil

Recent innovations in analytical methods for the qualitative and quantitative assessment of lignin

Cork-Containing Barks—A Review

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