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Handbook of Size Exclusion Chromatography and Related ...

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Figure 3 Separation <strong>of</strong> HaeIII-cleaved pBR322 obtained on a TSKgel G3000SW twocolumn<br />

system at a flow rate <strong>of</strong> 1 mL/min (a) or on a TSKgel G4000SW two-column system<br />

at a flow rate <strong>of</strong> 0.33 mL/min (b) (each column 60 cm 7.5 mm ID) in 0.05 M Tris–HCl<br />

buffer (pH 7.5) containing 0.2 M sodium chloride <strong>and</strong> 1 mM EDTA. (From Ref. 11.)<br />

TSKgel DNA-PW estimated by utilizing the value <strong>of</strong> void volume was<br />

approximately 7,000 base pairs. Therefore, SEC should be very useful in the<br />

field <strong>of</strong> genetic engineering, in which the separation <strong>of</strong> large DNA fragments in the<br />

range <strong>of</strong> 1,000–5,000 is important. However, it seems that DNA fragments larger<br />

than 7,000 base pairs cannot be separated at present because no commercially<br />

available aqueous SEC columns have higher exclusion limits than TSKgel<br />

DNA-PW.<br />

© 2004 by Marcel Dekker, Inc.

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