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Contaminant Detection Assays

Contamination detection assays can be used in a broad range of applications to measure contamination in a variety of sample content from fermentation supernatants and purification processes to biochemical preparations such as serum and other bodily fluids. They also measure the presence of host cell DNA as well as other DNA that might have been introduced during the biopharmaceutical manufacturing process.


Molecular Devices offers two contaminant detection assay kits under its Threshold brand: Threshold™ Immunoligand Assay (ILA) and Threshold™ Total DNA Assay

Threshold Immunoligand Assay measures a broad range of analytes such as proteins, peptides, sequence specific DNA and microorganisms for biopharmaceutical development and production.  Samples can range from fermentation supernatants, samples from a purification process, and other biochemical preparations to serum or other bodily fluids. Assays can be developed using a sandwich or competitive format depending on the size and characteristics of the analyte to be measured.

Threshold Total DNA Assay quantitatively measures picograms of single-stranded DNA. Unlike hybridization techniques which require DNA probes or primers with a specific nucleic acid sequence, the Threshold Total DNA Assay measures DNA with broad sequence specificity. This enables the Threshold System to measure host cell DNA as well as other DNA that might have been introduced during the biopharmaceutical manufacturing process. In addition, since the assay does not require sequence-specific probes or primers, it can easily be applied to different samples purified from different host organisms.

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