Determinação da relação siringila/guaiacila da lignina em madeiras de eucalipto por pirólise acoplada à cromatografia gasosa e espectrometria de massas (PI CG/EM) Determination of the siringyl/guaiacyl ratio in eucalyptus wood by pyrolysis-gas chroma-tography/mass spectrometry (PY-GC/MS)

• Main Authors: Luiz C. A. Barbosa, Célia R. A. Maltha, Vanessa Lopes Silva, Jorge Luiz Colodette
• Format: Article
• Language: English
• Published: Sociedade Brasileira de Química 2008-01-01
• Series: Química Nova
• Subjects: pyrolysis; S/G ratio; lignin
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422008000800023
• ISSN: 0100-4042; 1678-7064

<abstract language="eng">The use of analytical pyrolysis combined with gas chromatography/mass spectrometry (Py-GC/MS) to determine the syringyl/guaiacyl ratio (S/G) in lignins from Eucalyptus spp woods was investigated. Sample of E. grandis and "E. urograndis" wood, with and without extractives, were subjected to pyrolysis from 300 ºC to 600 ºC. The products that results from pyrolysis were identified by mass spectrometry and the S/G ratio was determined based on the areas of the peaks corresponding to the guaiacyl and syringyl derivatives. The best S/G estimation is achieved when pyrolysis is carried out at 550 ºC. Extractives and carbohydrate present in the woods do not interfere with the results.