Enzyme protectant HP is a broad-spectrum enzyme, antigen, and antibody stabilizer, suitable for pH 5-9 liquid and lyophilizer systems; mainly used to stabilize thrombin, glycosidase, ribose oxidase, esterase, hexokinase, coagulation Enzymes, hemostatic APTT reagents, serum proteins, etc. It is better to use it in combination with HPD or AFP alone.