التفاصيل البيبلوغرافية
| العنوان: |
Ferulates and lignin structural composition in cork |
| المؤلفون: |
V Marques, A, RENCORET, JORGE, Gutiérrez, Ana, Río, José C. del, Pereira, Helena |
| المساهمون: |
RCIPL |
| بيانات النشر: |
Walter de Gruyter GMBH, 2016. |
| سنة النشر: |
2016 |
| مصطلحات موضوعية: |
2D-NMR, Ferulic acid, HSQC, Py-TMAH, Quercus suber, Suberin |
| الوصف: |
The structure of lignin and suberin, and ferulic acid (FA) content in cork from Quercus suber L. were studied. Extractive-free cork (Cork), suberin, desuberized cork (Cork(sap)), and milled-cork lignins (MCL) from Cork and Cork(sap) were isolated. Suberin composition was determined by GC-MS/FID, whereas the polymers structure in Cork, Corksap, and MCL was studied by Py-TMAH and 2D-HSQC-NMR. Suberin contained 94.4% of aliphatics and 3.2% of phenolics, with 90% of omega-hydroxyacids and alpha,omega-diacids. FA represented 2.7% of the suberin monomers, overwhelmingly esterified to the cork matrix. Py-TMAH revealed significant FA amounts in all samples, with about 3% and 6% in cork and cork lignins, respectively. Py-TMAH and 2D-HSQC-NMR demonstrated that cork lignin is a G-lignin (>96% G units), with a structure dominated by beta-O-4' alkyl-aryl ether linkages (80% and 77% of all linkages in MCL and MCLsap, respectively), followed by phenylcoumarans (18% and 20% in MCL and MCLsap, respectively), and smaller amounts of resinols (ca. 2%) and dibenzodioxocins (1%). HSQC also revealed that cork lignin is heavily acylated (ca. 50%) exclusively at the side-chain gamma-position. Ferulates possibly have an important function in the chemical assembly of cork cell walls with a cross-linking role between suberin, lignin and carbohydrates. |
| نوع الوثيقة: |
journal article |
| وصف الملف: |
application/pdf |
| اللغة: |
English |
| العلاقة: |
MARQUES, António Jorge Velez; [et. al.] - Ferulates and lignin structural composition in cork. Holzforschung. ISSN 0018-3830. Vol. 70, N.º 4 (2016), pp. 275-286; 0018-3830 |
| DOI: |
10.1515/hf-2015-0014 |
| الإتاحة: |
http://hdl.handle.net/10400.21/6286Test |
| حقوق: |
metadata only access |
| رقم الانضمام: |
rcaap.com.ipl.repositorio.ipl.pt.10400.21.6286 |
| قاعدة البيانات: |
RCAAP |
