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(a) HP-SEC elution curves of the dried lignin nanoparticles fractions from mixed sawdust re-dissolved in 10 mM NaOH (LNPs-IRNS) at 280 and 340 nm; (b,c) FTIR spectra of the Acidolysis lignin fraction from Iroko and Iroko–Norway spruce sawdust (AL-IR, AL-IRNS) and of their respective freeze-dried lignin nanoparticles (LNPs-IR, LNPs-IRNS).
