采用磁控溅射、光刻、离子束刻蚀、及剥离工艺等技术和方法,制备了多层膜结构的阵列式巨磁电阻(giant magneto resistive,GMR)传感器芯片,可同时对多指标进行检测,并研究了GMR生物传感器上蛋白质分子的固定及检测.传感器表面通过等离子体与聚乙烯亚胺(polyethyleneimine,PEI)修饰后,可特异性地结合抗体分子.在蛋白质分子的固定实验中,使用人免疫球蛋白G(immunoglobulin G,IgG)作为探针修饰在传感器表面,以捕获生物素标记的驴抗人IgG,,并通过亲和素标记过的直径300nm的超顺磁磁珠检测GMR生物传感器的信号.本实验对五种浓度的驴抗人IgG进行了检测,得到了4～164mΩ的GMR电阻变化值,且GMR信号与驴抗人IgG的浓度呈半对数关系.该阵列式GMR传感器芯片可用于定量检测生物样品中某种或某几种蛋白浓度的实验,并有望未来应用于临床检测中.
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