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Thermo Scientific™ Pierce™ BCA Protein Assay Kit - Reducing Agent Compatible

Catalog No. PI23250
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PI23250 275 mL
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Catalog No. PI23250 Supplier Thermo Scientific™ Supplier No. 23250
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Description

Reducing agent-compatible version of our popular BCA Reagent Kit to measure protein concentration in samples containing DTT or BME thiol-reductants.

This reducing agent-compatible (RAC) version of the Thermo Scientific™ Pierce BCA Protein Assay provides accurate determination of protein concentration in samples that contain dithiothreitol (DTT), 2-mercaptoethanol (BME), TCEP and other disulfide reducing agents.

The BCA Protein Assay Kit - Reducing Agent Compatible (BCA-RAC) provides all of the advantages of the original BCA Assay, plus compatibility with disulfide reducing agents at concentrations routinely used in protein sample buffers. This special adaptation of the popular Pierce BCA Protein Assay method enables accurate protein concentration measurement for samples containing DTT, 2-ME or TCEP. Available in tube and microplate formats, these reducing agent compatible (RAC) BCA Kits extend the already broad reagent compatibility of the BCA Protein Assay protocol to include nearly all types of components commonly present in protein research samples.

Highlights:

  • Compatible – assay samples that contain up to 5mM DTT, 35mM BME, or 10mM TCEP

  • BCA technology – only a slight modification of the standard BCA Protein Assay protocol (15-minute incubation with Compatibility Reagent); no precipitation steps required

  • Small samples – requires only 25μL (standard kit) or less than 10μL (microplate kit) of sample

  • Colorimetric – measure with a standard spectrophotometer or plate reader (562nm)

  • Excellent uniformity – exhibits less protein-to-protein variation than dye-binding methods

  • High linearity – linear working range for BSA equals 125 to 2000μg/mL

Includes:

BCA Reagents A and B, Compatibility Reagent, Reconstitution Buffer, and Albumin Standard (2mg/mL); Microplate kit also includes assay-compatible 96-well microplates

Specifications

Content And Storage Sufficient For: 250 tube assays with 25 μL samples
• BCA Reagent A, 250 mL
• BCA Reagent B, 25 mL
• Compatibility Reagent, 10 x 20 mg
• Reconstitution Buffer, 15 mL
• Albumin Standard Ampules, 2mg/mL, 10 x 1 mL

Store at room temperature
Description Pierce BCA Tube Protein Assay Kit, Reducing Agent Compatible (RAC)
Assay BCA Assay
Detection Method Colorimetric
Product Line Pierce
Product Type Protein Quantitation Assay
Specificity Not Target-Specific
Sufficient For 250 Tube Assays
For Use With (Application) Solution-based Detection, Absorbance
For Use With (Equipment) Spectrophotometer, Microplate Reader
Quantity 275 mL
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Frequently Asked Questions (FAQs)

Which Thermo Scientific protein assay is the best or the most reliable?

The choice of protein assay is dependent on preferences related to assay speed, accuracy and sensitivity, as well as interfering substances in the sample to be assayed. BCA has less protein-to-protein variation, is compatible with most detergents, and has larger working range. Pierce Bradford Plus Protein Assay Kit (Cat. No. 23236) is compatible with reducing sugars, is more sensitive and is faster and easier to use. For a comparison of different protein assays and compatible reagents, see our Tech Tip: Protein Quantitation Assay Compatibility Table (https://assets.thermofisher.com/TFS-Assets/LSG/Application-Notes/TR0068-Protein-assay-compatibility.pdf).
Can the compatibility reagent in the BCA-RACE kit be stored after reconstitution and reused?

The reconstituted compatibility reagent is stable for 8 hours when stored at 4 degrees C protected from light.
How many assays can be performed with each BCA-RAC kit?

The BCA Protein Assay Kit - Reducing Agent Compatible (Cat. No. 23250) has sufficient reagents for 250 samples or standards of 25µL each, and the Microplate BCA Protein Assay Kit - Reducing Agent Compatible (Cat. No. 23252) can be used to assay 1,000 samples or standards of 9µL each.
Can I increase the volumes of the sample and compatibility reagent in the microplate assay when using the BCA-RAC?

No. Increasing the sample and compatibility reagent volumes will require increasing the BCA working reagent, resulting in a volume that exceeds the well capacity. There must be space remaining in the well to allow mixing and prevent the solution from contacting the sealing tape.
What formats are available for the BCA-RAC?

There are two different formats: the BCA Protein Assay Kit - Reducing Agent Compatible (Cat. No. 23250) for microcentrifuge tube (1.5ml) assays and Microplate BCA Protein Assay Kit - Reducing Agent Compatible (Cat. No. 23252) for 96-well plates. The tube assay is compatible with 5mM DTT, 10mM TCEP and 35mM 2ME, and the microplate assay is compatible with 5mM DTT, 10mM TCEP and 25mM 2ME.
How does the BCA-RAC compare with the original BCA assay?

The BCA-RAC provides the advantages of the original BCA assay (compatibility with detergents, buffer/salts and solvents) combined with reducing agent compatibility at concentrations routinely used in protein sample buffers. The BCA assay is based on reduction of Cu+2 to Cu+1 by proteins in an alkaline solution and the subsequent complexing of the Cu+1 to BCA reagent, yielding a purple color detectable at 562nm. Disulfide reducing agents such as DTT, 2ME and TCEP are also capable of reducing Cu+2 to Cu+1. To minimize their reducing effect, a compatibility reagent that modifies disulfide reducing agents is added to the sample before performing the assay.
Can you provide the shelf-life for the Pierce BCA Protein Assay Kit-Reducing Agent Compatible?

The Pierce BCA Protein Assay Kit-Reducing Agent Compatible is covered under our general 1-year warranty and is guaranteed to be fully functional for 12 months from the date of shipment, if stored as recommended (room temperature). Please see section 8.1 of our Terms & Conditions of Sale (https://www.thermofisher.com/content/dam/LifeTech/Documents/PDFs/Terms-and-Conditions-of-Sale.pdf) for more details.
Which protein assay is my lysis compatible with?

Please check the Protein Assay Compatibility Table in this Tech Tip (https://assets.thermofisher.com/TFS-Assets/LSG/Application-Notes/TR0068-Protein-assay-compatibility.pdf) to determine which protein assay would be most effective with your sample type.

For Research Use Only. Not for use in diagnostic procedures.