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Protein Expression & Purification

Products >  Protein_Expression_and_Purification >  Baculovirus_Expression >  Baculovirus_Titration_Kits

Baculovirus Titration Kits

This kit provides a fast and simple method for determining titers of baculovirus stocks. The kit uses a standard immunological assay to accurately determine baculovirus titers within 48 hours, while plaque and end-point dilution assays typically require 5–10 days.

In BacPAK Baculovirus Expression Systems, infected cells express viral antigens long before plaques are formed. The BacPAK Rapid Titer assay allows titer determination after a much shorter incubation period. Furthermore, the titers obtained are comparable to those obtained with other methods. This kit is suitable for use with any virus stock with a titer of more than 104 pfu/ml and is compatible with all commonly available (AcMNPV-based) baculovirus expression systems.

The Rapid Titer immunoassay uses a primary monoclonal antibody raised against an AcMNPV envelope glycoprotein (gp64) to accurately identify virus-infected cells. A secondary HRP-conjugated antibody enables you to visualize infected cells by light microscopy and determine viral titer. Recently we have improved the protocol to consistently offer our best ever signal-to-noise ratio for identifying cells.

BacPAK qPCR Titration Kit

This kit provides an extremely fast and simple method for titrating your viral stocks. The kit uses a quick DNA purification step before determining viral genome content using qPCR and TB Green technologies. This titration kit requires only 4 hours and works with any AcMNPV-based baculoviral vector. Using qPCR enables you to perform viral harvest and target cell infection on the same day. You can avoid delays that lead to reduced viral infectivity and infect target cells at a known multiplicity of infection (MOI) for more consistent results.

The BacPAK qPCR Titration determines the viral genome copy number in baculoviral preparations from a calibrated DNA standard curve. The procedure is simple: viral DNA and BacPAK control DNA are serially diluted and subjected to qPCR. The DNA copy number of each viral sample is then determined by comparing its Ct value to a standard curve generated by plotting the Ct values of the diluted control samples against their respective copy numbers.

With its simplicity, reproducibility, and short processing time, the BacPAK qPCR Titration Kit is ideal for determining baculoviral DNA titers. Accurate and rapid titration provides the means to producing consistent results using high-quality viral supernatants in the shortest possible time.

Why you need to know your titer:

  • Confirm the success of your packaging reaction to avoid wasting time with your experiments
  • Perform consistent experiments
  • Ensure sufficient MOIs such that 100% of your cells are transduced
  • Control copy number and hence expression levels

  At-A-Glance   Documents   Images & Data   Resources


  • Saves time by shortening baculovirus expression experiments up to six days
  • Eliminates troublesome plaque assays
  • Compatible with any AcMNPV-based baculovirus expression systems
  • Rapid determination of viral titers
  • Harvest, titer, and infect in a single day
  • Accurate titers produce the most consistent infection results


  • Determine baculovirus titers, in order to optimize recombinant protein expression

Additional Information

Please see the product's Certificate of Analysis for information about storage conditions, product components, and technical specifications. Please see the Kit Components List to determine kit components. Certificates of Analysis and Kit Components Lists are located under the Documents tab.

Cat. # Product Contents Size Price License Units Select
631406 BacPAK™ Baculovirus Rapid Titer Kit 5 Assays $428.00 License Statements
631414 BacPAK™ qPCR Titration Kit 200 Rxns $469.00  


Required Products
Cat. # Product Contents Size Price # of Units Select
631402 BacPAK™ Baculovirus Expression System Each $867.00



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