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Cleaning Validation | Campaign Cleaning Validation (CCV)

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When the product demand does not allow for a complete clean up after each batch, a campaign cleaning validation must be conducted.   A back to back cleaning is performed between batches in a campaign, and a complete cleaning at the end of a campaign. Sampling of the equipment is performed after the last batch in a campaign, and all test results must meet predetermined acceptance criteria as per campaign cleaning validation protocol.   Samples for residual active may be taken after back to back cleanings where possible, for information only . Microbiology samples may be taken after back to back cleanings in a campaign to ensure that there is no excessive microbial growth on the equipment.
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Western blot | troubleshooting | samples turn yellow and precipitate

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Why western Blot samples turn yellow and precipitate? Sample appears to be acidic. Bromophenol blue in the loading buffer turns to yellow at acidic pH (below 3). Try to adjust the pH by adding NaOH [ 1 ].  Reason for that is proteins may be getting degraded due to heat exposure. One researcher had the same problem and so instead of keeping samples at 95 ° c  he started warming at 60-65 °  C. So anyone can try it out and as [ 1 ] said check the pH as well of the loading dye [ 2] .  Heating a sample also changes pH. An altered pH is not only responsible to turn the sample color yellow, but may also precipitate the proteins. Keeping SDS containing samples in ice is another common mistake to see this precipitation [ 3 ].  Another researcher said that he has got to do more with the total protein concentration in the lysate. He faced the same problem of precipitation upon denaturation at 100 ° c . He added 1/10th volume of 10% SDS and then boiled. Protein did not precipitate. T
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