• Pre-configured kits to analyze peptides, proteins and total DNA using a single system
• All reagents provided to label your antibodies or commercially available antibodies quickly and easily
• Assay dynamic range of 2 logs or greater enables the use of the same method from purification to product QC
• High assay sensitivity without the use of radioactive reagents that require expensive disposal
• Assay precision typically <10% for reproducible quantitation of contaminant levels in final product
• Hybridization of the analyte occurs in the liquid phase for faster binding kinetics
• Antigen-antibody complex is captured and concentrated on a membrane to achieve sensitivity equal to or better than radioimmunoassay, and at least 10 times better than ELISAs
• Rapid sample analysis streamlines media selection and optimization of purification conditions
• Strepavidin's strong affinity for biotin captures and concentrates analyte for high assay selectivity
• The speed and sensitivity of Threshold enables the monitoring of protein production during the early stages of fermentation
• Immunoassay detects protein degradation and conformational changes of protein products
• Accurate quantitation to identify the optimal harvest time to maximize product yield from fermentations
• Validated assays using quality controlled reagents and software
• Software requires individual passwords and user IDs to access, managed access to major features, audit trail, and signed electronic statements complies with FDA 21 CFR Part 11 requirements

Threshold Software controls the workstation and collects and analyzes data. It includes five standard curve fits to provide the highest accuracy when quantitating unknowns. A complete summary report detailing the results can be printed or exported for further analysis.

The optional Threshold Enterprise Software has a spike recovery report for analysis of the results within the software application, a complete validation package that allows current and future Threshold System users to comply with GLP/GMP/FDA 21 CFR Part 11 requirements. Threshold Enterprise Software includes the following security tools:

• Individual passwords and user IDs
• Permission managed access to major features
• Audit trail of log-on and log-off activities and all user actions that modify the file
• Signed electronic statements

The Threshold system measures a wide range of analytes such as host cell proteins, bovine contaminants (BSA, IgG, transferring and insulin), Protein A and G, peptides and total DNA at low concentrations using an enzyme-linked immunoassay. Analytes are measured by incubating them with the appropriate antibody, binding protein or oligonucleotide probe which is labeled with streptavidin and conjugated to urease to form a complex. The sample mixture is then filtered through a biotinyylated membrane to actively capture and concentrate the analyte complex from the sample matrix. The filter is inserted into the reader and detection of the enzyme-labeled complex occurs in 90 sec by measuring the rate of enzyme turnover using a low noise silicon sensor.

Assay sensitivity for proteins is typically equal to or better than radioimmunassays and at least 10X better than ELISAs. For total DNA, assay sensitivity of 2 pg can be achieved. The Threshold Software controls the instrument and collects and analyzes the data. To simplify assay development, the following reagent kits are available to label your antibodies or commercially available antibodies,

• Immunoligand Assay Kit

  Immuno-Ligand Assay (ILA) measures a broad range of analytes such as, drugs, proteins, and micro-organisms 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.

• Total DNA Assay Kit

  The 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, Total DNA assay measures DNA with broad sequence specificity.

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