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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 | Re-use a primary antibody

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Why reuse primary antibody? Western blotting is one of the most common method for detecting and semi-quantifying specific proteins. The cost of running a Western is predominantly driven by detection antibodies, which are used to probe membrane-bound target protein(s). Although some antibodies can be produced cheaply in-house, most antibodies must be commercially ordered. Reusing antibodies for subsequent Westerns can save your lab a considerable amount of money. So money is nothing but everything. In conclusion economic research practises is  budget friendly and reuse of primary antibody is one of them.  When reuse is problematic? The most standard phospho-antibody protocols involve blocking with 5% milk in PBS or TBS (0.1% Tween 20), followed by a couple washing steps with PBS or TBS to remove the excess milk.  If you dilute your antibody in a milk solution, storage and re-use will be extremely problematic, because the milk will "go bad" and fall...
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