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- Phage Purification
- March-April
- May-June
- July-August
- September-October
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8.12 CsCl Gradient
I) Purpose
- Further purify the phage to a high level of purification.
II) Expected Outcome
- Purified and viable phage will be extracted from the CsCl gradient.
III) Reagants Used
- T7 mutant phage
- CsCl
- dialysis tubing
- phage suspension buffer
IV) Actual Procedure
- Create different concentrations of CsCl solutions to create a gradient.
- 1.1 - 2 mL
- 1.2 - 2 mL
- 1.25 - 2 mL
- 1.3 - 2 mL
- 1.35 - 2mL
- 1.4 - 2 mL
- 1.5 - 3 mL
- 1.6 - 2 mL
- Layer the gradient into two centrifuge tubes, using half of the total volume created for each tube. For example, add 2 mL of 1.3 density to one tube and the other 2 mL to another tube.
- Fill the remaining space in the tube with phage suspension buffer to the top.
- Centrifuge at 26500 rpms (100,000 g) for 2.5 hours.
- Extract using a needle and puncturing the side of the tube, placing the needle underneath the band.
- Place phage in dialysis tubing and place in flask with 1 L of phage suspension buffer for 30 minutes at 4◦ C.
- Repeat previous step three more times.
- Remove purified phage from dialysis tubing and store in 4◦ C.
V) Results
- The Phage did not band anywhere
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