Here, we present a mechanochemical one-pot reaction to depolymerise high-molecular-mass fractions in Kraft lignin (BioPiva 190) using sodium percarbonate (SPC) and simultaneously introduce new carbonyl functions into the structure. The samples were analysed by infrared spectroscopy (IR), size exclusion chromatography (SEC), dynamical vapour sorption (DVS) and small-angle X-ray scattering (SAXS). Principal component analysis (PCA) was used for advanced data analysis of the high dimensional IR dataset and to show correlations in the SAXS dataset.