申请人:BIO-RAD LABORATORIES, INC.
公开号:EP0724154A1
公开(公告)日:1996-07-31
Electrophoresis is performed in buffers which exhibit both substantial buffering capacity and low electrical conductivity, permitting the separations to be performed at high field strengths without loss of resolution. Four classes of buffering agents are cited as examples:
(1) buffering agents with a small number of charged groups per molecule;
(2) carrier ampholytes fractionated to a narrow isoelectric point range;
(3) low molecular weight buffering ampholytes with an isoelectric point which is close in value to one of the pK values of the ampholyte; and
(4) high molecular weight buffering ampholytes in which the acidic and basic groups have the same or very close pK values.
These buffering agents are of particular interest in capillary electrophoresis.
电泳是在缓冲剂中进行的,缓冲剂既有很强的缓冲能力,又有很低的导电性,因此可以在高场强下进行分离而不会降低分辨率。现举四类缓冲剂为例:
(1) 每分子含有少量带电基团的缓冲剂;
(2) 等电点范围窄的载体两性溶解物;
(3) 等电点接近两性溶解物 pK 值的低分子量缓冲两性溶解物;以及
(4) 酸性和碱性基团的 pK 值相同或非常接近的高分子量缓冲两性溶解物。
这些缓冲剂在毛细管电泳中特别有用。