Affinity Chromatography - Department of Molecular and Cellular ...
Affinity Chromatography - Department of Molecular and Cellular ...
Affinity Chromatography - Department of Molecular and Cellular ...
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Cleaning<br />
These procedures are applicable to Glutathione Sepharose 4 Fast Flow <strong>and</strong> Glutathione<br />
Sepharose 4B.<br />
1. Wash with 2–3 column volumes <strong>of</strong> alternating high pH (0.1 M Tris-HCl, 0.5 M NaCl,<br />
pH 8.5) <strong>and</strong> low pH (0.1 M sodium acetate, 0.5 M NaCl, pH 4.5) buffers.<br />
2. Repeat the cycle 3 times.<br />
3. Re-equilibrate immediately with 3–5 column volumes <strong>of</strong> binding buffer.<br />
If the medium is losing binding capacity, this may be due to an accumulation <strong>of</strong> precipitated,<br />
denatured or non-specifically bound proteins.<br />
To remove precipitated or denatured substances:<br />
1. Wash with 2 column volumes <strong>of</strong> 6 M guanidine hydrochloride.<br />
2. Wash immediately with 5 column volumes <strong>of</strong> binding buffer.<br />
To remove hydrophobically bound substances:<br />
1. Wash with 3–4 column volumes <strong>of</strong> 70% ethanol (or 2 column volumes <strong>of</strong> a non-ionic<br />
detergent (Triton X-100 1%)).<br />
2. Wash immediately with 5 column volumes <strong>of</strong> binding buffer.<br />
Media characteristics<br />
Spacer arm Lig<strong>and</strong> <strong>and</strong> density pH stability* Mean particle size<br />
Glutathione Sepharose 4 10 carbon linker Glutathione Short term 6–9 90 µm<br />
Fast Flow (GSTrap) 120–320 µmoles/ml Long term 6–9<br />
Glutathione Sepharose 4B 10 carbon linker Glutathione Short term 4–13 90 µm<br />
7–15 µmoles/ml Long term 4–13<br />
*Long term refers to the pH interval over which the medium is stable over a long period <strong>of</strong> time without adverse effects<br />
on its subsequent chromatographic performance. Short term refers to the pH interval for regeneration, cleaning-in-place<br />
<strong>and</strong> sanitization procedures.<br />
Chemical stability<br />
No significant loss <strong>of</strong> binding capacity when exposed to 0.1 M citrate (pH 4.0), 0.1 M NaOH,<br />
70% ethanol or 6 M guanidine hydrochloride for 2 hours at room temperature. No significant<br />
loss <strong>of</strong> binding capacity after exposure to 1% SDS for 14 days.<br />
Storage<br />
Wash media <strong>and</strong> columns with 20% ethanol at neutral pH (use approximately 5 column<br />
volumes for packed media) <strong>and</strong> store at +4 to +8 °C.<br />
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