Antibody Titer Determination and Recombinant Protein Quantitation

 

Pall ForteBio's Octet® family of instruments provides rapid and accurate analysis of antibody and other protein concentrations. Its analytical capabilities provide particular value in applications where existing methods such as HPLC and ELISA have limitations in throughput, performance, workflow, and ease of use.

Octet QK correlation with HPLC.

Figure 1: Octet QK correlation with HPLC.

Bioreactor process time profile of cell culture supernatants.

Figure 2: Bioreactor process time profile of cell culture supernatants.

With full-plate quantitation in as little as two minutes, Octet instruments provide label-free quantitation of antibodies or other proteins that are critical to:

  • Early cell culture screening
  • Protein purification
  • Cell line selection for optimization of antibody production
  • Biologicals manufacturing monitoring

Key Benefits

  • Fast and high throughput quantitation
  • Specific quantitation in crude matrices
  • Quantitation is done in real time
  • Wider dynamic range than ELISA
  • Expensive samples can be recovered
  • Cost savings through biosensor surface regeneration

Antibody quantitation is critical to the selection of cell lines for development and the optimization of bioreactor titers in production. Traditional measurement methods include ELISA, HPLC, nephelometry, and densitometry. Drawbacks to these methods include long analysis times, lack of specificity, labor-intensive protocols, and variable imprecision. The BLI-based Octet family of instruments support each step of bioprocessing, streamlining and speeding your workflow.

Comparison of time versus speed involved in protein quantitation using the Octet method and alternative methods.

Figure 3: Comparison of time versus speed involved in protein quantitation using the Octet method and alternative methods.

The Octet family of instruments provides a complete on-demand, label-free solution for both antibody and recombinant protein quantitation. While HPLC monitors total protein content, the Octet systems monitor specific analyte concentrations and even though both techniques have comparable quantitation dynamic range for a generic IgG molecule, Octet systems have 10-fold lower limit of detection (LOD) and 20-fold lower limit of quantitation (LOQ) than HPLC.

Off-the shelf biosensors offered include the below and a host of other biosensors targeting recombinant protein quantitation are ready to use in quantitating a variety of IgG isotypes and other proteins.

Streptavidin-coated and Amine Reactive Biosensors expand your quantitation options to include all proteins in developing custom protein assays that are easier to process than ELISAs, while still providing rapid and accurate results.

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