在纸层析法中,常应用比移值,即R_F(或R_f)值的概念,所谓R_F值就是被分离物质从原点至斑点间距离与原点至前沿间距离之比,如图1所示,即;除非另有说明,距离一般是从斑点的中心量起。有时,距离OA是从原点量至斑点的边沿或斑点中物质的最大浓度的一点,但是这些应该有较显明的边沿或者 In paper chromatography, often used than the value of the shift, the concept of R_F (or R_f) value, the so-called R_F value is separated from the original material to the distance between the spot and the distance from the origin to the leading edge ratio, as shown in Figure 1 , Ie, the distance is generally measured from the center of the blot unless otherwise specified. Sometimes, the distance OA is the point from the origin point to the edge of the spot or the point of maximum concentration of matter in the spot, but these should have more pronounced edges or