Fig. 2

Scanning electron microscope images of the dry particles in the H4000 (A) and H10000 (B) hydrolysates, and hydrothermal centrifugal residues (HR) (C); FTIR images (D), XPS full scan spectra (E) and XPS C 1 s spectra (F) of the dry particles in the H4000 and H10000 hydrolysates, and HR.