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Reconstitute the lyophilized antiserum by adding 1 mL sterile distilled water.
Inter-species cross reactivity is a normal feature of antibodies to animal proteins since homologous proteins of different species frequently share antigenic determinants. This antiSerum has not been adsorbed for such cross reactivity. Consequently it is not speciesspecific.
In immunoelectrophoresis use 2 µL milk or equivalent against 120 µL antiserum. In double radial immunodiffusion (Ouchterlony) use a rosette arrangement with 10 µL antiserum in 3 mm diameter center well and 2 µL milk samples (neat and serially diluted in 2 mm diameter peripheral wells. Different bleedings of the immunized animals are pooled to obtain a broad spectrum balanced against the varying concentrations of the individual protein components in individual milk samples.
Dilutions may be prepared by adding phosphate buffered saline (PBS, pH 7.2). Repeated thawing and freezing should be avoided. If a slight precipitation occurs upon storage, this should be removed by centrifugation. It will not affect the performance of the antiserum. Diluted antiserum should be stored at 4°C, not refrozen, and preferably used the same day.
In immunoelectrophoresis against milk precipitation of not less than 7 different proteins may be obtained. However the number of visible precipitin lines varies widely among individual specimens of milk. The total concentration of protein, their proportion of the different protein components change markedly during the course of lactation. A protein detected in a human secretion by this antiserum may be of secretory origin, or it may be a plasma protein presumably entering in the secretion from the surrounding capillary vessels and through interstitial tissues. Virtually every plasma protein may also be present at a detectable level in milk. Not all precipitable proteins have been identified. Known proteins include secretory IgA and other immunoglobulins, free secretory component, lactoferrin, components of the complement system and albumin.
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