02286naa a2200373 a 450000100080000000500110000800800410001902200140006002400560007410000160013024501820014626000090032852011090033765000130144665000120145965300250147165300180149665300200151465300180153465300260155265300200157865300240159865300220162270000240164470000160166870000240168470000230170870000240173170000180175570000240177370000200179770000170181777300780183421659912024-11-27       2024    bl uuuu     u00u1 u    #d  a0141-81307 ahttps://doi.org/10.1016/j.ijbiomac.2024.1333492DOI1 aAVELINO, F.  aUnraveling the structural aspects of microwave-assisted OrganoCat-based coconut shell ligninsban eco-friendly route for obtaining bio-based antioxidants.h[electronic resource]  c2024  aNew routes for biomass valorization have been developing by the scientific community. The aim of this work was developing a novel OrganoCat-based protocol and deeply understand the structure of the obtained lignins. Microwave-assisted OrganoCat-based process was performed using a biphasic system (ethyl acetate and oxalic acid or HCl) at mild conditions. OrganoCat-based lignins (OCLs) were characterized by compositional analysis, FTIR, 1H, 13C, 1H–13C HSQC, 31P NMR, TGA and GPC. The solubility of OCLs in different organic solvents and their antioxidant capacity against DPPH• were investigated. The spectroscopic analyses showed that OCLs have high residual extractives and the lignin motifs were preserved. OCLs have presented lower thermal stability than MWL, but showed great antioxidant activities and high solubility in a wide range of organic solvents. A novel biorefinery protocol yielded coconut shell lignins with peculiar structural and compositional features and several technological applications through an eco-friendly, sustainable and relatively low-cost biphasic pulping process.  aBiomassa  aLignina  aBiomass valorization  aBiorrefinaria  aBiphasic system  aCasca de coco  aDownstream processing  aLignin platform  aLignin valorization  aSistema bifásico1 aFELIPE, V. T. de A.1 aDIAS, M. T.1 aNOVAIS, L. M. R. de1 aD'OCA, C. da R. M.1 aMARQUES NETO, F. P.1 aSOARES, A. K.1 aMAGALHAES, W. L. E.1 aMAZZETTO, S. E.1 aLOMONACO, D.  tInternational Journal of Biological Macromoleculesgv. 274, 133349, 2024.