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电泳法，是指带电荷的供试品（蛋白质、核苷酸等）在惰性支持介质（如纸、醋酸纤维素、琼脂糖凝胶、聚丙烯酰胺凝胶等）中，于电场的作用下，向其对应的电极方向按各自的速度进行泳动，使组分分离成狭窄的区带，用适宜的检测方法记录其电泳区带图谱或计算其含量.