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Caracterização do teor e composição estrutural da lenhina por espectroscopia de infravermelho próximo e pirólise analítica
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Resumo(s)
In this work analytical pyrolysis and near infrared spectroscopy (NIR) were
used to assess lignin amount and composition, namely the H/G (phydroxyphenyl/
guaiacyl) ratio, in the wood of three softwood species Pinus
pinaster, Picea abies and Larix sp..
A method was developed for the quantification of lignin directly from
analytical pyrolysis results (Py-lignin). A good correlation was found
between Py-lignin and Klason lignin content (R2=0,93). A commom model
(Py-lignin=0,7188×Klason lignin+4,3045) was obtained for the three
species studied, allowing the estimation of lignin in samples of 75 μg.
Analytical pyrolysis in combination with principal component analysis also
allowed the identification of species and provenances within species.
Rapid, non-destructive methods were developed for the quantification of
lignin (R2=0,97) and determination of lignin composition (R2=0,89) by near
infrared spectroscopy, using Klason and analytical pyrolysis as reference
methods. These NIR models were used for the characterization of samples
from an improvement program for wood quality of Pinus pinaster, and
revealed that lignin quantity is under stronger genetic control (0,75), whilst
lignin composition is under moderate genetic control (0,24)
Descrição
Doutoramento em Engenharia Florestal - Instituto Superior de Agronomia
Palavras-chave
softwoods Pinus pinaster Picea abies Larix sp. lignin H/G ratio analytical pyrolysis near infrared spectroscopy Klason method