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Handbook of Size Exclusion Chromatography and Related ...

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preparative SEC. The capabilities <strong>of</strong> these systems range from low-throughput,<br />

high-resolution preparative HPLC systems to low-pressure, high-throughput, skidmounted<br />

systems. These systems can be custom designed to a limited extent,<br />

however.<br />

7 MICROBORE SEC<br />

Although microbore SEC has been used routinely for GPC (primarily in organic<br />

solvents) <strong>and</strong> products are available from MZ-Analysentechnik GmbH, only<br />

Pharmacia <strong>of</strong>fers microbore prepacked columns for SEC <strong>of</strong> proteins. For the<br />

SMART TM <strong>Chromatography</strong> System, Pharmacia <strong>of</strong>fers Superdex 75 <strong>and</strong> 200 <strong>and</strong><br />

Superose 6 <strong>and</strong> 12 in Precision Columns (PC) 3.2 30cm columns. Using the<br />

SMART System, Superdex 75 is excellent for separating monomeric <strong>and</strong> dimeric<br />

forms <strong>of</strong> lower molecular weight recombinant proteins <strong>and</strong> peptides. Superdex 200<br />

is designed to separate larger protein molecules, including antibodies, <strong>and</strong> nucleic<br />

acids up to 200 base pairs. These MPSEC media are prepacked with 13mm media.<br />

Most narrow-bore columns have an inner diameter (ID) <strong>of</strong> 4.6mm, directly<br />

between the st<strong>and</strong>ard-analytical columns with 8mm inner diameter <strong>and</strong> the<br />

microbore columns are usually 3mm, 2mm, or 1.6mm in ID. While the microbore<br />

columns can only be used in specially equipped chromatography hardware, the<br />

narrow-bore columns may directly be run (with modest optimization) in st<strong>and</strong>ard<br />

equipment. The use <strong>of</strong> reduced-bore columns instead saves up to 70% <strong>of</strong> eluent<br />

<strong>and</strong> narrow-bore columns are less sensitive to variations in flow <strong>and</strong> require less<br />

sample. They also show a more flat MW calibration curve than analytical columns.<br />

There is ample evidence that narrow <strong>and</strong> microbore columns give excellent SEC<br />

separations.<br />

8 ACKNOWLEDGEMENTS<br />

The authors again wish to dedicate this work to the memory <strong>of</strong> Phil G. Squire. His<br />

passion for gel filtration began with a visit to Uppsala in 1960, before widespread<br />

interest in the field <strong>of</strong> column chromatography ignited. This work was funded by<br />

the U.S. Department <strong>of</strong> Energy Office <strong>of</strong> the Biomass Program.<br />

REFERENCES<br />

1. Discuss Faraday Soc 7:114, 1949.<br />

2. L Hagel, J-C Janson. In: E Heftmann, ed. <strong>Chromatography</strong>, Part A: Fundamentals <strong>and</strong><br />

Techniques. Vol. 51A, Amsterdam: Elservier, 1992, pp A267–A307.<br />

3. J Porath, P Flodin. Nature 183:1647, 1959.<br />

© 2004 by Marcel Dekker, Inc.

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