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Tips and hints for the storage of antibodies
  Monoclonal antibodies

Ascites. When ascites is reconstituted by addition of water, we usually add small amounts of azide or thimerosal to prevent microbial growth. Ascites should be stored frozen. Monoclonals usually do not suffer from repetitive freeze-thawing but you may aliquot them into small samples to avoid too many freeze-thaw cycles.
Prolonged storage at 4C is not recommended! Unlike serum, ascites may contain proteases that will ultimately degrade the antibodies. Addition of protease inhibitors helps to slow degradation.

Purified IgG. Do not store diluted antibody solutions unless you add detergent or carrier proteins such as goat serum, BSA or others. IgG sticks to glass and plastic. Any IgG solution below 0.1 mg/ml protein will quickly adsorb and denature and thus loose activity! Repetitive freeze-thawing of dilute purified IgG is almost certain to lead to substantial losses

  Rabbit sera

Sera are more robust than monoclonals. With anti-microbials added, they may be stored at 4C (serum does not contain active proteases, in fact, serum itself contains a powerful cocktail of protease inhibitors). Frozen storage, however, is preferable.