Table 2.

Contents (mmol g⁻¹) and locations of hydroxyl groups in these two lignin nanoparticles as determined by quantitative ³¹P NMR spectroscopy

Sample	DLNPs	OLNPs
Aliphatic–OH	2.40	1.04
Syringyl–OH	1.31	2.03
Guaiacyl–OH	0.90	1.20
p-hydroxyphenyl–OH	0.23	0.15
Carboxylic–OH	0.18	0.09
Total phenolic–OH	2.44	3.37