N-Acetylneuraminic Acid Aldolase (NAL, EC 4.1.3.3), which catalyzes the reaction of N-acetylneuraminic acid to N-acetyl-D mannosamine and pyruvate. Our company's N-acetylneuraminate aldolase is a genetically recombinant product with high purity and good activity, free from animal derived viruses. Biochemical research: The concentration of sialic acid (SA) in the blood has been regarded as an important indicator for monitoring the presence and development of malignant tumors, and has been widely used in the diagnosis and monitoring of various tumors (such as lung cancer, gastric cancer, colorectal cancer, liver cancer, ovarian cancer, etc.). Enzymatic detection of sialic acid has the advantages of fast, simple, high sensitivity, and easy automation. NAL is a very important enzyme in the sialic acid enzyme detection kit, which catalyzes the conversion of N-acetylneuraminic acid to pyruvate, and completes the detection reaction of the entire kit through subsequent pyruvate reactions. Therefore, it has a very important role and significance.