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5 lignosulfonate has been investigated as a water reducers or superplasticizers for concrete given that it is the most prevalent biopolymer after cellulose lignin has been investigated as a feedstock for biofuel production 26 27 biosynthesis edit lignin biosynthesis begins in the cytosol with the synthesis of glycosylated monolignols from the amino acid phenylalanine these first reactions are shared with the phenylpropanoid pathway the attached glucose renders them water soluble and less toxic once transported through the cell membrane to the apoplast the glucose is removed and the polymerisation commences 28 much about its anabolism is not understood even after more than a century of study 5 initial stages in the formation of lignin from coniferyl alcohol the reaction is catalysed byoxidative enzymes peroxidases or oxidases lignan is a precursor to lignin the polymerisation step that is a radical radical coupling is catalysed by oxidative enzymes both peroxidase and laccase enzymes are present in the plant cell walls and it is not known whether one or both of these groups participates in the polymerisation low molecular weight oxidants might also be involved the oxidative enzyme catalyses the formation of monolignol radicals these radicals are often said to undergo uncatalyzed coupling to form the lignin polymer 29 an alternative theory invokes an unspecified biological control 1 biodegradation edit in contrast to other bio polymers e g proteins dna and even cellulose lignin resists degradation it is immune to both acid and base catalyzed hydrolysis the degradability varies with species and plant tissue type for example syringyl s lignin is more susceptible to degradation by fungal decay as it has fewer aryl aryl bonds and a lower redox potential than guaiacyl units 30 31 because it is cross linked with the other cell wall components lignin minimizes the accessibility of cellulose and hemicellulose to microbial enzymes e g steric hindrance leading to a reduced digestibility of biomass 15 some ligninolytic enzymes include heme peroxidases such as lignin peroxidases manganese peroxidases versatile peroxidases and dye decolourizing peroxidases as well as copper based laccases lignin peroxidases oxidize non phenolic lignin whereas manganese peroxidases only oxidize the phenolic structures dye decolorizing peroxidases or dyps exhibit catalytic activity on a wide range of lignin model compounds but their in vivo substrate is unknown in general laccases oxidize phenolic substrates but some fungal laccases have been shown to oxidize non phenolic substrates in the presence of synthetic redox mediators 32 33 lignin degradation by fungi edit well studied ligninolytic enzymes are found in phanerochaete chrysosporium 34 and other white rot fungi some white rot fungi such as ceriporiopsis subvermispora can degrade the lignin in lignocellulose but others lack this ability most fungal lignin degradation involves secreted peroxidases many fungal laccases are also secreted which facilitate degradation of phenolic lignin derived compounds although several intracellular fungal laccases have also been described an important aspect of fungal lignin degradation is the activity of accessory enzymes to produce the h 2 o 2 required for the function of lignin peroxidase and other heme peroxidases 32 lignin degradation by bacteria edit bacteria lack most of the enzymes employed by fungi to degrade lignin and lignin derivatives aliphatic acids furans and solubilized phenolics inhibit the growth of bacteria 35 yet bacterial degradation can be quite extensive 36 especially in aquatic systems such as lakes rivers and streams where inputs of terrestrial material e g leaf litter can enter waterways the ligninolytic activity of bacteria has not been studied extensively even though it was first described in 1930 many bacterial dyps have been characterized bacteria do not express any of the plant type peroxidases lignin peroxidase mn peroxidase or versatile peroxidases but three of the four classes of dyp are only found in bacteria in contrast to fungi most bacterial enzymes involved in lignin degradation are intracellular including two classes of dyp and most bacterial laccases 33 in the environment lignin can be degraded either biotically via bacteria or abiotically via photochemical alteration and oftentimes the latter assists in the former 37 in addition to the presence or absence of light several of environmental factors affect the biodegradability of lignin including bacterial community composition mineral associations and redox state 38 39 in shipworms the lignin it ingests is digested by alteromonas like sub group bacteria symbionts in the typhlosole sub organ of its cecum 40 pyrolysis edit pyrolysis of lignin during the combustion of wood or charcoal production yields a range of products of which the most characteristic ones are methoxy substituted phenols of those the most important are guaiacol and syringol and their derivatives their presence can be used to trace a smoke source to a wood fire in cooking lignin in the form of hardwood is an important source of these two compounds which impart the characteristic aroma and taste to smoked foods such as barbecue the main flavor compounds of smoked ham are guaiacol and its 4 5 and 6 methyl derivatives as well as 2 6 dimethylphenol these compounds are produced by thermal breakdown of lignin in the wood used in the smokehouse 41 chemical analysis edit main article lignin characterization the conventional method for lignin quantitation in the pulp industry is the klason lignin and acid soluble lignin test which is standardized procedures the cellulose is digested thermally in the presence of acid the residue is termed klason lignin acid soluble lignin asl is quantified by the intensity of its ultraviolet spectroscopy the carbohydrate composition may be also analyzed from the klason liquors although there may be sugar breakdown products furfural and 5 hydroxymethylfurfural 42 a solution of hydrochloric acid and phloroglucinol is used for the detection of lignin wiesner test a brilliant red color develops owing to the presence of coniferaldehyde groups in the lignin 43 thioglycolysis is an analytical technique for lignin quantitation 44 lignin structure can also be studied by computational simulation 45 thermochemolysis chemical break down of a substance under vacuum and at high temperature with tetramethylammonium hydroxide tmah or cupric oxide 46 has also been used to characterize lignins the ratio of syringyl lignol s to vanillyl lignol v and cinnamyl lignol c to vanillyl lignol v is variable based on plant type and can therefore be used to trace plant sources in aquatic systems woody vs non woody and angiosperm vs gymnosperm 47 ratios of carboxylic acid ad to aldehyde al forms of the lignols ad al reveal diagenetic information with higher ratios indicating a more highly degraded material 30 31 increases in the ad al value indicate an oxidative cleavage reaction has occurred on the alkyl lignin side chain which has been shown to be a step in the decay of wood by many white rot and some soft rot fungi 30 31 48 49 50 lignin and its models have been well examined by 1 h and 13 c nmr spectroscopy owing to the structural complexity of lignins the spectra are poorly resolved and quantitation is challenging 51 see also edit carboniferous period coal formation references edit 1 2 saake bodo lehnen ralph 2007 lignin ullmann s encyclopedia of industrial chemistry weinheim wiley vch doi 10 1002 14356007 a15_305 pub3 isbn 978 3527306732 lebo stuart e jr gargulak jerry d mcnally timothy j 2001 lignin kirk othmer encyclopedia of chemical technology kirk othmer encyclopedia of chemical technology john wiley sons inc doi 10 1002 0471238961 12090714120914 a01 pub2 isbn 978 0 471 23896 6 archived from the original on 2020 04 10 retrieved 2007 10 14 de candolle m a p 1813 theorie elementaire de la botanique ou exposition des principes de la classification naturelle et de l art de decrire et d etudier les vegetaux paris deterville see p 417 e sjöström 1993 wood chemistry fundamentals and applications academic press isbn 978 0 12 647480 0 1 2 3 w boerjan j ralph m baucher june 2003 lignin biosynthesis annu rev plant biol 54 1 519 549 doi 10 1146 annurev arplant 54 031902 134938 pmid 14503002 lignin encyclopedia britannica 2023 10 05 retrieved 2023 10 26 martone pt estevez jm lu f ruel k denny mw somerville c ralph j jan 2009 discovery of lignin in seaweed reveals convergent evolution of cell wall architecture current biology 19 2 169 75 bibcode 2009cbio 19 169m doi 10 1016 j cub 2008 12 031 issn 0960 9822 pmid 19167225 s2cid 17409200 in the referenced article the species of aspen is not specified only that it was from canada hsiang hui king peter r solomon eitan avni robert w coughlin fall 1983 modeling tar composition in lignin pyrolysis pdf symposium on mathematical modeling of biomass pyrolysis 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