Table 1.

Photoinitiator types widely used for hydrogel photo-crosslinking.

Name	Abbreviation	Light	Ref
1-[4-(2-hydroxyethoxy) phenyl]-2-hydroxyl-2-methyl-1-acetone	Irgacure 2959	UV	[25,26,27,28]
Lithium phenyl-2,4,6-trimethylbenzoyl phosphinate	LAP	UV visible light	[29,30,31,32]
2, 4, 5, 7-tetrabromofluorescein disodium salts	Eosin Y	visible light	[33,34]
2-Hydroxy-2-Methylphenylacetone	Irgacure 1173	UV	[35,36]
lactochrome	riboflavin	visible light	[37]