Protein Quantification Assays

Protein assays, most notably quantitation or estimation assays, for determining protein concentration are one of the most widely used methods in life science research. Protein estimation of protein concentration is necessary in protein purification, electrophoresis, cell biology, molecular biology, and other research applications. We offer a unique selection of protein estimation assays that are improvements on the Biuret, Lowry, BCA and Bradford assays.  Each assay has its own benefits, however the NI™ (Non-Interfering™) Protein Assay and CB X™ Protein Assay overcome all interfering agents.

Although there are a wide variety of protein assays available, none of the assays can be used without first considering their suitability for the application. Each method has its own advantages and limitations and often it is necessary to obtain more than one type of protein assay for research applications.For additional information on protein assays, read the Protein Assays Handbook & Selection Guide.

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Assay Tubes

Wide bottomed protein assay tubes, 2ml reaction volumes. Allows proper mixing of assay reaction and good color development...

PhosphoQuant™

PhosphoQuant™ is specifically designed for quick and reliable determination of whether a purified protein is phosphorylated and the extent of phosphorylation. The assay is based on the alkaline hydrol..

Assay Cuvettes

Spectrophotometer assay cuvettes, 1ml reaction volume, not suitable for UV absorbances. Available as 1 box of 100 cuvettes or a pack of 5 x 100 cuvettes. ..

Bicinchoninic Acid (BCA) Protein Assay

The Bicinchoninic Acid (BCA) Protein Assay, also known as the Smith Assay, is a highly sensitive colorimetric assay that is compatible with detergent solubilized protein solutions.   The Bi..

Bicinchoninic Acid (BCA) Reducing Agent Compatible Protein Assay

The Bicinchoninic Acid (BCA) Protein Assay is a highly sensitive colorimetric assay that is compatible with detergent solubilized protein solutions, however is dramatically affected by the presence of..

Bovine Serum Albumin Standards

We offer two options for the BSA protein standards:   Bovine Serum Albumin Standard BSA standard (2mg/ml) prepared in saline buffer. Supplied as 2 x 5ml size.   Prediluted BSA P..

Bovine y-Globulin Standards

We offer two opitions for the Bovine γ-globulin standards:   Bovine γ-Globulin Standard γ-Globulin standard (2mg/ml) prepared in saline buffer. Supplied as 2 x 5ml size...

CB X™ Protein Assay

Protein assays are routinely used in many research fields to estimate proteins in a vast array of buffers and conditions. A major problem for researchers is to select a protein assay from the vast sel..

CB™ Protein Assay

An improved Coomassie Dye based protein assay based on the Bradford Protein Assay (1). This assay is suitable for the simple and rapid estimation of protein concentration. This assay is based on a sin..

CL (Compatible Lowry) Protein Assay

G-Biosciences’ CL (Compatible Lowry) Protein Assay is based on the widely cited protein assay by Lowry et. al. (1951). The CL Protein Assay improves upon the traditional Lowry method to be compa..

Micro Bicinchoninic Acid (BCA) Protein Assay

The Micro Bicinchoninic Acid (BCA) Protein Assay is a highly sensitive colorimetric assay that is compatible with detergent solubilized protein solutions. This modification of the Bicinchoninic Acid (..

ML (Modified Lowry) Protein Assay

G-Biosciences’ ML (Modified Lowry) Protein Assay is based on the widely cited protein assay by Lowry et. al. (1951). The ML Protein Assay is compatible with a wide variety of detergents used in ..