Enzymatic hydrolysis of the industrial solid residue of red seaweed after agar extraction: Extracts characterization and modelling

•EAE is a suitable technique to valorize the residue from algae after agar extraction.•Cell wall degradation by hydrolytic enzymes allows TPC release.•Cellulase presented higher hydrolytic capacity than other enzymes or their mixtures.•Carbohydrate fraction was released as monomers and oligomers.•Protease allowed the preferential release of hydrophobic amino acids.