Abstract :
[en] Cannabis sp. and Euphorbia sp. are potential candidates as indoor culture for the
extraction of their high value-added metabolites for pharmaceutical applications. Both
residual lignocellulosic materials recovered after extraction are studied in the present
article as single or mixed feedstocks for a closed-loop bioprocesses cascade. An alkaline
process (NaOH 3%, 30min 160◦C) is performed to separate the studied biomasses
into their main components: lignin and cellulose. Results highlight the advantages of
the multi-feedstocks approach over the single biomass in term of lignin yield and
purity. Since the structural characteristics of lignin affect the potential applications, a
particular attention is drawn on the comprehension of lignin structure alteration and
the possible interaction between them during single or mixed feedstocks treatment.
FTIR and 2D-NMR spectra revealed similar profiles in term of chemical functions and
structure rather than novel chemical bonds formation inexistent in the original biomasses.
In addition, thermal properties and molecular mass distribution are conserved whether
hemp or euphorbia are single treated or in combination. A second treatment was applied
to investigate the effect of prolonged treatment on extracted lignins and the possible
interactions. Aggregation, resulting in higher molecular mass, is observed whatever the
feedstocks combination. However,mixing biomass does not affect chemical structures of
the end product. Therefore, our paper suggests the possibility of gathering lignocellulosic
residues during alkali process for lignin extraction and valorization, allowing to forecast
lignin structure and make assumptions regarding potential valorization pathway.
Disciplines :
Physical, chemical, mathematical & earth Sciences: Multidisciplinary, general & others
Name of the research project :
Programme VERDIR - Portefeuille Tropical Plant Factory - Projet BioResidu
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