1. Product:

High purity Lignin organosolv is extracted from corn cob using a combination of enzymatic hydrolysis and chemical separation techniques. This enzymatic lignin has the characteristics of high purity (content ≥ 98%) and high activity (phenolic hydroxyl group ≥ 16%), which is superior to similar lignin products at home and abroad.

Lignin organosolv has various functional properties due to its structural characteristics and reaction activity advantages. In recent years, the application research and development of enzymatic lignin in polymer synthesis and modification have been rapid. It can be widely used in rubber tires, polyurethane plastics and foam, phenolic resin adhesive, epoxy resin, batteries, biological detergents and printed circuit boards, agricultural and degradable products, etc. 

Natural lignin is an important component of plant fibers, accounting for approximately 17% to 25% of plant fibers. Lignin is an amorphous three-dimensional aromatic polymer and the only renewable and biodegradable aromatic compound. Lignin is formed by dehydrogenation polymerization of three alcohol monomers, namely p-coumarin, paclitaxel, and sinapine. These three alcohol monomers correspond to the three basic structural units of phenylpropane that make up lignin, namely p-hydroxyphenyl (H), guaiacyl (G), and syringayl (S), as shown in Figure 1.

The molecular structure of lignin monomers contains various active functional groups, such as hydroxyl, carbonyl, carboxyl, methyl, and side chain structures. The content of hydroxyl groups in lignin is relatively high, existing in two forms: alcohol hydroxyl and phenolic hydroxyl. The amount of phenolic hydroxyl groups directly affects the physical and chemical properties of lignin, reflecting the degree of etherification and condensation of lignin, as well as measuring its solubility and reactivity.

In the cell wall structure of wood biomass, lignin covalently crosslinks with hemicellulose through ether bonds, ester bonds, phenyl glycosidic bonds, aldehyde bonds, and hydrogen bonds, existing in the form of lignin carbohydrate complexes in the cell wall, forming large molecules with a three-dimensional network structure. In addition, hemicellulose and lignin also cross wrap cellulose, forming a complex and dense plant cell wall structure. Figure 2 shows the three-dimensional view of lignin carbohydrate in the wood cell wall.