Abstract
Lignin is a biopolymer extremely abundant with phenolic characteristics that have great potential for use in various applications. However, their three-dimensional structure of complex formation varies depending on various aspects including the specie and the way of obtaining. In this context, this study aimed to characterize the lignin obtained from four species (Eucalyptus paniculata Sm, Eucalyptus botryoides Sm, Eucalyptus tereticornis Smith, Corymbia citriodora Hook) through Organosolv process (ethanol/water). Lignins were determined as its composition, structure and functional groups. The reactivity of lignins was analyzed by total phenol content and the oxidant power. The physic-chemical properties of the lignins were determined by alternative techniques such as GPC (gel permeation chromatography) and ATR-IR (infrared attenuated total reflectance). The results showed that the lignin obtained from different species by the Organosolv process has high purity, because they have low levels of sugars and inorganic contaminants. In addition, all lignins presented high polydispersity and a higher average molecular weight was verified in E. paniculata lignin.
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