Evaluation of Lignins of Trunk and Roots from Citrus sinensis L. Osbeck: A Large Available Brazilian Biomass

Autor(es)

Porto, Deyvid S. ^[1] ; Forim, Moacir R. ^[1] ; Costa, Eveline S. ^[1] ; Fernandes, Joao B. ^[1] ; da Silva, Maria F. G. F. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Quim, Lab Prod Nat, Rod Washington Luiz, Km 235, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Brazilian Chemical Society; v. 32, n. 1, p. 29-39, JUL 2021.
• Citações Web of Science: 0

Resumo

Citrus biomass is a source of biobased products and presents extensive chemical diversity. Among the structural macromolecules, lignins have been used in resins, bioplastics, and nanoencapsulation. Brazil has a large source of lignins, which are orange trees removed from groves that need to be renewed. However, the knowledge about these lignins is limited and little explored. Thus, this work aimed to evaluate the lignins from Citrus sinensis and to provide information on the interesting use of orange trees as a source of macromolecules. The lignins were isolated from the trunk, central and secondary roots from the orange tree by Technical Association of the Pulp and Paper Industry (TAPPI)-methods. The lignin contents for the extractive-free samples were 19.8 ± 0.19, 21.9 ± 0.36, and 19.5 ± 0.41% (m/m) in the trunk, central and secondary roots, respectively. Infrared (IR) and 13C nuclear magnetic resonance (NMR) analyses confirmed typical bands and chemical shifts to syringyl and guaiacyl units. These results are consistent with the features of lignins previously reported for orange tree branches and hardwood roots. The greatest amount of lignin in the orange tree was found in the central root. The lignins extractive-free by TAPPI-T264 cm-97 presented low solubility in organic solvents, due to their compaction and folding, which was confirmed by 13C NMR in the solid-state, differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). (AU)

• Processo FAPESP: 11/11860-5 - Estudos fitoquímicos de plantas do cerrado e seu potencial no controle de micro-organismos simbiótico de insetos praga
• Beneficiário: Moacir Rossi Forim
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 11/00970-4 - Nano e micro encapsulamento de extratos vegetais de Meliaceae para controle de pragas de solo usando ligninas do bagaço de cana-de-açúcar
• Beneficiário: Eveline Soares Costa
• Modalidade de apoio: Bolsas no Brasil - Doutorado