Normal donkey serum occupies a specific and defensible place in immunoassay design. When your secondary antibodies are donkey-derived, your blocking agent needs to match.
Using serum from a different species introduces proteins your detection system may cross-react with, adding background noise that a correctly matched normal serum eliminates at the source.
The application case is clearest in multiplex labeling protocols, particularly in mouse central nervous system tissue work, where multiple primary and secondary antibodies from different host species run simultaneously. Donkey secondary antibodies are frequently chosen in these systems precisely because donkey serum as a blocking agent suppresses non-specific antibody binding across the tissue without interfering with any of the detection channels in use.
Equitech-Bio supplies normal donkey serum processed from controlled collections for consistent blocking performance. Use normal serum diluted in your buffer of choice before applying the primary antibody to saturate available binding sites. Centrifuge reconstituted serum briefly if particulates are present after thawing.
For cross-species detection panels, normal donkey serum works alongside mouse IgG antibody and rabbit IgG antibody reference standards and pairs with goat anti-mouse IgM and human blood plasma in complex multi-species workflows. Research use only.
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