Table 1.

Selected lignin review articles published since 2010, highlighting different focal topics, ordered from primarily concerned with upstream (e.g., lignin biosynthesis, structure) to downstream (e.g., catalytic transformations) process steps.

Focal topic(s)	Ref.
Lignin biosynthesis & structure	1, 2, 3, 4, 5, 6, 7, 8, 9
Bioengineering of lignins	8, 9, 10, 11, 12, 13
Biotic/abiotic stress and effects on lignification	6, 7, 8, 9, 10, 11
Lignin depolymerisation	14
Catalytic (deoxygenative) valorisation to fuel and chemicals	15, 16, 17, 18
Pyrolysis, hydrodeoxygenation, catalytic upgrading	19, 20, 21
Oxidative valorisation of lignin	22, 23, 24
Lignin for polymers and composites	25, 26, 27, 28, 29, 30
Lignin analytics	31, 32, 33, 34, 35, 36, 37
Biodegradation of lignin	38, 39, 40