FENG Chun-liang, LIU Yuan-yuan, LI Ya-nan, et al. Study on direct potentiometric immunosensor based on 4-hydroxy thiophenol SAMs[J]. 2007, (5): 15-17. DOI: 10.13873/j.1000-97872007.05.015.
An immobilization procedure of antibody on planar gold electrode is proposed.A pretreated planar gold electrode is first immersed in 4-hydroxy thiophenol(4—HTH) solution for self assembly through the Au-S covalent bond.Then
antibody(sheep-anti-mouse IgG) is immobilized by means of covalent coupling with the activation of 1-ethyl-3-(3-dimethylamino propyl) carbodiimide hydrochloride(EDC) and N-hydroxysulfosuccinimide(NHS).The sensitivity of the procedure is high with the detection limit of 0.2 μg/L and a linear range from 0.2
3
0 μg/L.The immunosensor can be regenerated and the life can keep 10 days.Every immobilized step on planar Au electrode is characterized using cyclic voltammograms
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