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Delignification of Cistus ladanifer biomass by organosolv and alkali processes
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Orientador(es)
Resumo(s)
Residues of Cistus ladanifer obtained after commercial steam distillation for essential oil
production were evaluated to produce cellulose enriched solids and added-value lignin-derived
compounds. The delignification of extracted (CLRext) and extracted and hydrothermally pretreated
biomass (CLRtreat) was studied using two organosolv processes, ethanol/water mixtures (EO), and
alkali-catalyzed glycerol (AGO), and by an alkali (sodium hydroxide) process (ASP) under different
reaction conditions. The phenolic composition of soluble lignin was determined by capillary zone
electrophoresis and by Py-GC/MS, which was also used to establish the monomeric composition of
both the delignified solids and isolated lignin. The enzymatic saccharification of the delignified solids
was also evaluated. The ASP (4% NaOH, 2 h) lead to both the highest delignification and enzymatic
saccharification (87% and 79%, respectively). A delignification of 76% and enzymatic hydrolysis
yields of 72% were obtained for AGO (4% NaOH) while EO processes led to lower delignification
(maximum lignin removal 29%). The residual lignin in the delignified solids were enriched in Gand
H-units, with S-units being preferentially removed. The main phenolics present in the ASP and
AGO liquors were vanillic acid and epicatechin, while gallic acid was the main phenolic in the EO
liquors. The results showed that C. ladanifer residues can be a biomass source for the production of
lignin-derivatives and glucan-rich solids to be further used in bioconversion processes
Descrição
Palavras-chave
biorefinery enzymatic hydrolysis glucan-enriched solids lignin-derived products analytical pyrolysis rock-rose
Contexto Educativo
Citação
Alves-Ferreira, J.; Lourenço, A.; Morgado, F.; Duarte, L.C.; Roseiro, L.B.; Fernandes, M.C.; Pereira, H.; Carvalheiro, F. Delignification of Cistus ladanifer Biomass by Organosolv and Alkali Processes. Energies 2021, 14, 1127
Editora
MDPI