Single-stranded DNA (ssDNA) could be immobilized covalently on the surface of SA/CPE to fabricate ssDNA modified electrode (ssDNA/SA/CPE) in the presence of 1-Ethyl-3-(3-dimethyl-aminopropyl)ca-rbodiimide(EDC) and N-Hydroxyosuccinimide(NHS).

• 在活化剂EDC和NHS存在下,单链DNA探针(ssDNA)共价键合固定在SA/CPE上形成ssDNA修饰电极(ssDNA/SA/CPE);