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Affinity Capillary Electrophoresis 315<br />

0.02<br />

0.01<br />

A<br />

*<br />

Absorbance (200 nm)<br />

0.00<br />

-0.01<br />

7 8 9 10 11 12 13<br />

Time (min)<br />

0.02<br />

0.01<br />

B<br />

* *<br />

0.00<br />

-0.01<br />

7 8 9 10 11 12 13<br />

Time (min)<br />

C<br />

Fig. 3. Mapping of a heparin-binding site in human serum amyloid P component<br />

(SAP) using affinity capillary electrophoresis (CE) (76,110). (A, B) tryptic peptide<br />

map of SAP analysed by CE at 15 kV in a 50-m i.d. × 50/57 cm capillary in 0.1 M<br />

phosphate, pH 7.4, obtained in the absence (A) or presence (B) of 5 mg/ml heparin<br />

in the electrophoresis buffer. SAP was S-pyridylated and trypsinized (90) and 200 L<br />

digest was dried down and resolubilized with 50 L water + 20 L acetonitrile.

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