S-PPO is primarily derived from soil microorganisms, plant root exudates, and the decomposition of animal and plant residues. It catalyzes the oxidation of aromatic compounds in soil to quinones, which then react with substances such as proteins, amino acids, carbohydrates, and minerals in the soil to form organic matter and pigments, thereby completing the soil aromatic compound cycle and serving in soil environmental remediation.
Determination principle: S-PPO catalyzes the production of colored substances from pyrogallol, which exhibit characteristic light absorption at 430 nm.