The fate of lignin during hydrothermal pretreatment.
Identifieur interne : 002460 ( Main/Exploration ); précédent : 002459; suivant : 002461The fate of lignin during hydrothermal pretreatment.
Auteurs : Heather L. Trajano [États-Unis, Canada] ; Nancy L. Engle [États-Unis] ; Marcus Foston [États-Unis] ; Arthur J. Ragauskas [États-Unis] ; Timothy J. Tschaplinski [États-Unis] ; Charles E. Wyman [États-Unis]Source :
- Biotechnology for biofuels [ 1754-6834 ] ; 2013.
Abstract
BACKGROUND
Effective enzymatic hydrolysis of lignocellulosic biomass benefits from lignin removal, relocation, and/or modification during hydrothermal pretreatment. Phase transition, depolymerization/repolymerization, and solubility effects may all influence these lignin changes. To better understand how lignin is altered, Populus trichocarpa x P. deltoides wood samples and cellulolytic enzyme lignin (CEL) isolated from P. trichocarpa x P. deltoides were subjected to batch and flowthrough pretreatments. The residual solids and liquid hydrolysate were characterized by gel permeation chromatography, heteronuclear single quantum coherence NMR, compositional analysis, and gas chromatography-mass spectrometry.
RESULTS
Changes in the structure of the solids recovered after the pretreatment of CEL and the production of aromatic monomers point strongly to depolymerization and condensation being primary mechanisms for lignin extraction and redeposition. The differences in lignin removal and phenolic compound production from native P. trichocarpa x P. deltoides and CEL suggested that lignin-carbohydrate interactions increased lignin extraction and the extractability of syringyl groups relative to guaiacyl groups.
CONCLUSIONS
These insights into delignification during hydrothermal pretreatment point to desirable pretreatment strategies and plant modifications. Because depolymerization followed by repolymerization appears to be the dominant mode of lignin modification, limiting the residence time of depolymerized lignin moieties in the bulk liquid phase should reduce lignin content in pretreated biomass. In addition, the increase in lignin removal in the presence of polysaccharides suggests that increasing lignin-carbohydrate cross-links in biomass would increase delignification during pretreatment.
DOI: 10.1186/1754-6834-6-110
PubMed: 23902789
PubMed Central: PMC3751430
Affiliations:
- Canada, États-Unis
- Californie, Colombie-Britannique , Géorgie (États-Unis), Missouri (État), Tennessee
- Saint-Louis (Missouri), Vancouver
- Université Washington de Saint-Louis, Université de la Colombie-Britannique
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Trajano</name><affiliation wicri:level="2"><nlm:affiliation>Department of Chemical and Environmental Engineering and Center for Environmental Research and Technology, Bourns College of Engineering, University of California Riverside, 1084 Columbia Ave, Riverside, CA 92507, USA.</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Chemical and Environmental Engineering and Center for Environmental Research and Technology, Bourns College of Engineering, University of California Riverside, 1084 Columbia Ave, Riverside, CA 92507</wicri:regionArea><placeName><region type="state">Californie</region></placeName></affiliation><affiliation wicri:level="4"><nlm:affiliation>Current address: Department of Chemical and Biological Engineering, The University of British Columbia, 2360 East Mall, Vancouver, British Columbia V6T 1Z3, Canada.</nlm:affiliation><country xml:lang="fr">Canada</country><wicri:regionArea>Current address: Department of Chemical and Biological Engineering, The University of British Columbia, 2360 East Mall, Vancouver, British Columbia V6T 1Z3</wicri:regionArea><orgName type="university">Université de la Colombie-Britannique</orgName><placeName><settlement type="city">Vancouver</settlement><region type="state">Colombie-Britannique </region></placeName></affiliation><affiliation wicri:level="2"><nlm:affiliation>BioEnergy Science Center, Oak Ridge National Laboratory, PO Box 2008 MS6341, Oak Ridge, TN 37831, USA.</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>BioEnergy Science Center, Oak Ridge National Laboratory, PO Box 2008 MS6341, Oak Ridge, TN 37831</wicri:regionArea><placeName><region type="state">Tennessee</region></placeName></affiliation></author><author><name sortKey="Engle, Nancy L" sort="Engle, Nancy L" uniqKey="Engle N" first="Nancy L" last="Engle">Nancy L. Engle</name><affiliation wicri:level="2"><nlm:affiliation>Biosciences Division, Oak Ridge National Laboratory, PO Box 2008 MS6341, Oak Ridge, TN 37831, USA.</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Biosciences Division, Oak Ridge National Laboratory, PO Box 2008 MS6341, Oak Ridge, TN 37831</wicri:regionArea><placeName><region type="state">Tennessee</region></placeName></affiliation><affiliation wicri:level="2"><nlm:affiliation>BioEnergy Science Center, Oak Ridge National Laboratory, PO Box 2008 MS6341, Oak Ridge, TN 37831, USA.</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>BioEnergy Science Center, Oak Ridge National Laboratory, PO Box 2008 MS6341, Oak Ridge, TN 37831</wicri:regionArea><placeName><region type="state">Tennessee</region></placeName></affiliation></author><author><name sortKey="Foston, Marcus" sort="Foston, Marcus" uniqKey="Foston M" first="Marcus" last="Foston">Marcus Foston</name><affiliation wicri:level="2"><nlm:affiliation>School of Chemistry and Biochemistry, Institute of Paper Science and Technology, Georgia Institute of Technology, 500 10th Street N.W., Atlanta, GA 30332, USA.</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>School of Chemistry and Biochemistry, Institute of Paper Science and Technology, Georgia Institute of Technology, 500 10th Street N.W., Atlanta, GA 30332</wicri:regionArea><placeName><region type="state">Géorgie (États-Unis)</region></placeName></affiliation><affiliation wicri:level="4"><nlm:affiliation>Department of Energy, Environmental & Chemical Engineering, Washington University in St. Louis, 1 Brookings Drive, Saint Louis, MO 63130, USA.</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Energy, Environmental & Chemical Engineering, Washington University in St. Louis, 1 Brookings Drive, Saint Louis, MO 63130</wicri:regionArea><placeName><region type="state">Missouri (État)</region><settlement type="city">Saint-Louis (Missouri)</settlement></placeName><orgName type="university">Université Washington de Saint-Louis</orgName></affiliation><affiliation wicri:level="2"><nlm:affiliation>BioEnergy Science Center, Oak Ridge National Laboratory, PO Box 2008 MS6341, Oak Ridge, TN 37831, USA.</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>BioEnergy Science Center, Oak Ridge National Laboratory, PO Box 2008 MS6341, Oak Ridge, TN 37831</wicri:regionArea><placeName><region type="state">Tennessee</region></placeName></affiliation></author><author><name sortKey="Ragauskas, Arthur J" sort="Ragauskas, Arthur J" uniqKey="Ragauskas A" first="Arthur J" last="Ragauskas">Arthur J. Ragauskas</name><affiliation wicri:level="2"><nlm:affiliation>School of Chemistry and Biochemistry, Institute of Paper Science and Technology, Georgia Institute of Technology, 500 10th Street N.W., Atlanta, GA 30332, USA.</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>School of Chemistry and Biochemistry, Institute of Paper Science and Technology, Georgia Institute of Technology, 500 10th Street N.W., Atlanta, GA 30332</wicri:regionArea><placeName><region type="state">Géorgie (États-Unis)</region></placeName></affiliation><affiliation wicri:level="2"><nlm:affiliation>BioEnergy Science Center, Oak Ridge National Laboratory, PO Box 2008 MS6341, Oak Ridge, TN 37831, USA.</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>BioEnergy Science Center, Oak Ridge National Laboratory, PO Box 2008 MS6341, Oak Ridge, TN 37831</wicri:regionArea><placeName><region type="state">Tennessee</region></placeName></affiliation></author><author><name sortKey="Tschaplinski, Timothy J" sort="Tschaplinski, Timothy J" uniqKey="Tschaplinski T" first="Timothy J" last="Tschaplinski">Timothy J. Tschaplinski</name><affiliation wicri:level="2"><nlm:affiliation>Biosciences Division, Oak Ridge National Laboratory, PO Box 2008 MS6341, Oak Ridge, TN 37831, USA.</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Biosciences Division, Oak Ridge National Laboratory, PO Box 2008 MS6341, Oak Ridge, TN 37831</wicri:regionArea><placeName><region type="state">Tennessee</region></placeName></affiliation><affiliation wicri:level="2"><nlm:affiliation>BioEnergy Science Center, Oak Ridge National Laboratory, PO Box 2008 MS6341, Oak Ridge, TN 37831, USA.</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>BioEnergy Science Center, Oak Ridge National Laboratory, PO Box 2008 MS6341, Oak Ridge, TN 37831</wicri:regionArea><placeName><region type="state">Tennessee</region></placeName></affiliation></author><author><name sortKey="Wyman, Charles E" sort="Wyman, Charles E" uniqKey="Wyman C" first="Charles E" last="Wyman">Charles E. Wyman</name><affiliation wicri:level="2"><nlm:affiliation>Department of Chemical and Environmental Engineering and Center for Environmental Research and Technology, Bourns College of Engineering, University of California Riverside, 1084 Columbia Ave, Riverside, CA 92507, USA.</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Chemical and Environmental Engineering and Center for Environmental Research and Technology, Bourns College of Engineering, University of California Riverside, 1084 Columbia Ave, Riverside, CA 92507</wicri:regionArea><placeName><region type="state">Californie</region></placeName></affiliation><affiliation wicri:level="2"><nlm:affiliation>BioEnergy Science Center, Oak Ridge National Laboratory, PO Box 2008 MS6341, Oak Ridge, TN 37831, USA.</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>BioEnergy Science Center, Oak Ridge National Laboratory, PO Box 2008 MS6341, Oak Ridge, TN 37831</wicri:regionArea><placeName><region type="state">Tennessee</region></placeName></affiliation></author></analytic><series><title level="j">Biotechnology for biofuels</title><idno type="ISSN">1754-6834</idno><imprint><date when="2013" type="published">2013</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p><b>BACKGROUND</b></p><p>Effective enzymatic hydrolysis of lignocellulosic biomass benefits from lignin removal, relocation, and/or modification during hydrothermal pretreatment. Phase transition, depolymerization/repolymerization, and solubility effects may all influence these lignin changes. To better understand how lignin is altered, Populus trichocarpa x P. deltoides wood samples and cellulolytic enzyme lignin (CEL) isolated from P. trichocarpa x P. deltoides were subjected to batch and flowthrough pretreatments. The residual solids and liquid hydrolysate were characterized by gel permeation chromatography, heteronuclear single quantum coherence NMR, compositional analysis, and gas chromatography-mass spectrometry.</p></div><div type="abstract" xml:lang="en"><p><b>RESULTS</b></p><p>Changes in the structure of the solids recovered after the pretreatment of CEL and the production of aromatic monomers point strongly to depolymerization and condensation being primary mechanisms for lignin extraction and redeposition. The differences in lignin removal and phenolic compound production from native P. trichocarpa x P. deltoides and CEL suggested that lignin-carbohydrate interactions increased lignin extraction and the extractability of syringyl groups relative to guaiacyl groups.</p></div><div type="abstract" xml:lang="en"><p><b>CONCLUSIONS</b></p><p>These insights into delignification during hydrothermal pretreatment point to desirable pretreatment strategies and plant modifications. Because depolymerization followed by repolymerization appears to be the dominant mode of lignin modification, limiting the residence time of depolymerized lignin moieties in the bulk liquid phase should reduce lignin content in pretreated biomass. In addition, the increase in lignin removal in the presence of polysaccharides suggests that increasing lignin-carbohydrate cross-links in biomass would increase delignification during pretreatment.</p></div></front></TEI><pubmed><MedlineCitation Status="PubMed-not-MEDLINE" Owner="NLM"><PMID Version="1">23902789</PMID><DateCompleted><Year>2013</Year><Month>08</Month><Day>20</Day></DateCompleted><DateRevised><Year>2020</Year><Month>09</Month><Day>30</Day></DateRevised><Article PubModel="Electronic"><Journal><ISSN IssnType="Print">1754-6834</ISSN><JournalIssue CitedMedium="Print"><Volume>6</Volume><Issue>1</Issue><PubDate><Year>2013</Year><Month>Aug</Month><Day>01</Day></PubDate></JournalIssue><Title>Biotechnology for biofuels</Title><ISOAbbreviation>Biotechnol Biofuels</ISOAbbreviation></Journal><ArticleTitle>The fate of lignin during hydrothermal pretreatment.</ArticleTitle><Pagination><MedlinePgn>110</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1186/1754-6834-6-110</ELocationID><Abstract><AbstractText Label="BACKGROUND" NlmCategory="BACKGROUND">Effective enzymatic hydrolysis of lignocellulosic biomass benefits from lignin removal, relocation, and/or modification during hydrothermal pretreatment. Phase transition, depolymerization/repolymerization, and solubility effects may all influence these lignin changes. To better understand how lignin is altered, Populus trichocarpa x P. deltoides wood samples and cellulolytic enzyme lignin (CEL) isolated from P. trichocarpa x P. deltoides were subjected to batch and flowthrough pretreatments. The residual solids and liquid hydrolysate were characterized by gel permeation chromatography, heteronuclear single quantum coherence NMR, compositional analysis, and gas chromatography-mass spectrometry.</AbstractText><AbstractText Label="RESULTS" NlmCategory="RESULTS">Changes in the structure of the solids recovered after the pretreatment of CEL and the production of aromatic monomers point strongly to depolymerization and condensation being primary mechanisms for lignin extraction and redeposition. The differences in lignin removal and phenolic compound production from native P. trichocarpa x P. deltoides and CEL suggested that lignin-carbohydrate interactions increased lignin extraction and the extractability of syringyl groups relative to guaiacyl groups.</AbstractText><AbstractText Label="CONCLUSIONS" NlmCategory="CONCLUSIONS">These insights into delignification during hydrothermal pretreatment point to desirable pretreatment strategies and plant modifications. Because depolymerization followed by repolymerization appears to be the dominant mode of lignin modification, limiting the residence time of depolymerized lignin moieties in the bulk liquid phase should reduce lignin content in pretreated biomass. In addition, the increase in lignin removal in the presence of polysaccharides suggests that increasing lignin-carbohydrate cross-links in biomass would increase delignification during pretreatment.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y" EqualContrib="Y"><LastName>Trajano</LastName><ForeName>Heather L</ForeName><Initials>HL</Initials><AffiliationInfo><Affiliation>Department of Chemical and Environmental Engineering and Center for Environmental Research and Technology, Bourns College of Engineering, University of California Riverside, 1084 Columbia Ave, Riverside, CA 92507, USA.</Affiliation></AffiliationInfo><AffiliationInfo><Affiliation>Current address: Department of Chemical and Biological Engineering, The University of British Columbia, 2360 East Mall, Vancouver, British Columbia V6T 1Z3, Canada.</Affiliation></AffiliationInfo><AffiliationInfo><Affiliation>BioEnergy Science Center, Oak Ridge National Laboratory, PO Box 2008 MS6341, Oak Ridge, TN 37831, USA.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y" EqualContrib="Y"><LastName>Engle</LastName><ForeName>Nancy L</ForeName><Initials>NL</Initials><AffiliationInfo><Affiliation>Biosciences Division, Oak Ridge National Laboratory, PO Box 2008 MS6341, Oak Ridge, TN 37831, USA.</Affiliation></AffiliationInfo><AffiliationInfo><Affiliation>BioEnergy Science Center, Oak Ridge National Laboratory, PO Box 2008 MS6341, Oak Ridge, TN 37831, USA.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y" EqualContrib="Y"><LastName>Foston</LastName><ForeName>Marcus</ForeName><Initials>M</Initials><AffiliationInfo><Affiliation>School of Chemistry and Biochemistry, Institute of Paper Science and Technology, Georgia Institute of Technology, 500 10th Street N.W., Atlanta, GA 30332, USA.</Affiliation></AffiliationInfo><AffiliationInfo><Affiliation>Department of Energy, Environmental & Chemical Engineering, Washington University in St. Louis, 1 Brookings Drive, Saint Louis, MO 63130, USA.</Affiliation></AffiliationInfo><AffiliationInfo><Affiliation>BioEnergy Science Center, Oak Ridge National Laboratory, PO Box 2008 MS6341, Oak Ridge, TN 37831, USA.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y" EqualContrib="Y"><LastName>Ragauskas</LastName><ForeName>Arthur J</ForeName><Initials>AJ</Initials><AffiliationInfo><Affiliation>School of Chemistry and Biochemistry, Institute of Paper Science and Technology, Georgia Institute of Technology, 500 10th Street N.W., Atlanta, GA 30332, USA.</Affiliation></AffiliationInfo><AffiliationInfo><Affiliation>BioEnergy Science Center, Oak Ridge National Laboratory, PO Box 2008 MS6341, Oak Ridge, TN 37831, USA.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y" EqualContrib="Y"><LastName>Tschaplinski</LastName><ForeName>Timothy J</ForeName><Initials>TJ</Initials><AffiliationInfo><Affiliation>Biosciences Division, Oak Ridge National Laboratory, PO Box 2008 MS6341, Oak Ridge, TN 37831, USA.</Affiliation></AffiliationInfo><AffiliationInfo><Affiliation>BioEnergy Science Center, Oak Ridge National Laboratory, PO Box 2008 MS6341, Oak Ridge, TN 37831, USA.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y" EqualContrib="Y"><LastName>Wyman</LastName><ForeName>Charles E</ForeName><Initials>CE</Initials><AffiliationInfo><Affiliation>Department of Chemical and Environmental Engineering and Center for Environmental Research and Technology, Bourns College of Engineering, University of California Riverside, 1084 Columbia Ave, Riverside, CA 92507, USA.</Affiliation></AffiliationInfo><AffiliationInfo><Affiliation>BioEnergy Science Center, Oak Ridge National Laboratory, PO Box 2008 MS6341, Oak Ridge, TN 37831, USA.</Affiliation></AffiliationInfo></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType></PublicationTypeList><ArticleDate DateType="Electronic"><Year>2013</Year><Month>08</Month><Day>01</Day></ArticleDate></Article><MedlineJournalInfo><Country>England</Country><MedlineTA>Biotechnol Biofuels</MedlineTA><NlmUniqueID>101316935</NlmUniqueID><ISSNLinking>1754-6834</ISSNLinking></MedlineJournalInfo></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="received"><Year>2013</Year><Month>05</Month><Day>20</Day></PubMedPubDate><PubMedPubDate PubStatus="accepted"><Year>2013</Year><Month>07</Month><Day>26</Day></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2013</Year><Month>8</Month><Day>2</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2013</Year><Month>8</Month><Day>2</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2013</Year><Month>8</Month><Day>2</Day><Hour>6</Hour><Minute>1</Minute></PubMedPubDate></History><PublicationStatus>epublish</PublicationStatus><ArticleIdList><ArticleId 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(Missouri)</li><li>Vancouver</li></settlement><orgName><li>Université Washington de Saint-Louis</li><li>Université de la Colombie-Britannique</li></orgName></list><tree><country name="États-Unis"><region name="Californie"><name sortKey="Trajano, Heather L" sort="Trajano, Heather L" uniqKey="Trajano H" first="Heather L" last="Trajano">Heather L. Trajano</name></region><name sortKey="Engle, Nancy L" sort="Engle, Nancy L" uniqKey="Engle N" first="Nancy L" last="Engle">Nancy L. Engle</name><name sortKey="Engle, Nancy L" sort="Engle, Nancy L" uniqKey="Engle N" first="Nancy L" last="Engle">Nancy L. Engle</name><name sortKey="Foston, Marcus" sort="Foston, Marcus" uniqKey="Foston M" first="Marcus" last="Foston">Marcus Foston</name><name sortKey="Foston, Marcus" sort="Foston, Marcus" uniqKey="Foston M" first="Marcus" last="Foston">Marcus Foston</name><name sortKey="Foston, Marcus" sort="Foston, Marcus" uniqKey="Foston M" first="Marcus" last="Foston">Marcus Foston</name><name sortKey="Ragauskas, Arthur J" sort="Ragauskas, Arthur J" uniqKey="Ragauskas A" first="Arthur J" last="Ragauskas">Arthur J. Ragauskas</name><name sortKey="Ragauskas, Arthur J" sort="Ragauskas, Arthur J" uniqKey="Ragauskas A" first="Arthur J" last="Ragauskas">Arthur J. 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