ABSTRACT
Lignin is a group of conjugated phenolic acids found in plants in the approximate range of 15 to 40 percent dry weight that provide structural integrity to fruits, vegetables, and grains. Recent studies have shown that lignin is an important source of bioactive molecules. It can regulate food intake and digestion, improve bowel function, and alleviate constipation. The polymeric lignin can be converted into low molecular weight and monomeric aromatic forms that serve as the building block for chemical syntheses of high-value products. Alkali or acid modification, enzymatic treatments, and supercritical fluids have been evaluated to modify lignin and improve its antioxidant capacity.
