Conventional Test Method:

Mouse LD50 Assay for Botulinum Toxin Potency Testing

Alternative Test Method:

Name & Description:

Endopeptidase-MS assay

The two peptide products produced from the toxin action on the peptide are measured  using mass spectrometry. This has been successfully used to measure the activity of, and differentiate between, all seven BoNT serotypes. However, the sensitivity of this assay is affected by the sample matrix, which can cause it to vary by several orders of magnitude.

Validation Status:

US: ICCVAM workshop panel concluded that it is possible, in principle, to use an endopeptidase assay for estimating BoNT concentration in a pharmaceutical preparation. However, they cannot currently be used to replace animals for BoNT potency testing or for detecting BoNT in environmental or biological samples.  Future activities were recommended (2008).

Regulatory Status:


Effect or Potential Effect on Animal Use:


Information Last Reviewed:
May 2012