Bovine Serum Albumin (BSA) Blocking Buffer Recipe

Bovine serum albumin (BSA) blocking buffer is a commonly used solution for saturating excess protein-binding sites on membranes and microplates in various laboratory applications such as Western blotting and ELISA. It plays a crucial role in preventing nonspecific binding of antibodies and other proteins, thus enhancing the specificity and sensitivity of these assays.

BSA blocking buffer is typically prepared with a BSA concentration ranging from 1% to 3%, which is generally sufficient for most applications. The choice of concentration depends on the specific experimental requirements and the level of background noise to be minimized.

To prepare 100 mL of a 1% BSA blocking buffer, follow these steps:

  1. Gather the required materials:
    • 1 g of Bovine Serum Albumin (BSA)
    • 100 mL of TBST (Tris-Buffered Saline with Tween 20)
  2. Dissolve 1 g of BSA in 100 mL of TBST. This can be achieved by adding the BSA powder to the TBST solution while stirring gently. Ensure complete dissolution of BSA by continuing to stir until no visible particles are present.
  3. Once the BSA is completely dissolved, the resulting solution is now the 1% BSA blocking buffer. It is ready for use in Western blotting or ELISA experiments.

To facilitate the accurate preparation of BSA blocking buffer, you can use the BSA blocking buffer recipe calculator provided above. This calculator allows you to input your desired BSA concentration and volume, and with a simple click of the “CALCULATE” button, it generates a table with the amounts of BSA and TBST needed for your specific requirements.

Whether you are preparing enough BSA blocking buffer for a single experiment or for the entire laboratory, this calculator ensures precise measurements, saving you time and resources. By using the calculated amounts, you can confidently prepare the BSA blocking buffer and achieve optimal results in your protein binding assays.


1% in 100 mL Recipe BSA: % at Desired Volume: mL
1 g BSA g BSA
in 100 mL of 1X TBST in mL of 1X TBST