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Casein Blocking Buffer

for Northern and Southern blotting, powder blend

EC Number:

Quality Level


for molecular biology


powder blend

pH range

6.8 - 7.2 (reconstituted per directions)


H2O: soluble, faintly yellow (dissolves in 5-10 minutes.)

storage temp.

room temp

Related Categories

General description

Casein is a milk-derived substance routinely used in blocking buffers for Western, Southern and Northern Blot procedures. Blocking agents are used to reduce non-specific binding of detection reagents to the membranes.


1 L in poly bottle


Suitable as a blocking Buffer for Western, Southern and Northern Blot membranes. Blocked membranes can then be used in either chemiluminescent, colorimetric, or DIG detection assays.

Features and Benefits

  • Better blocking performance than dried milk or BSA
  • Compatible with neutral and positively-charged membranes
  • Compatible with chemiluminescent, colorimetric , and DIG detection assays

Preparation Note

Dissolve entire contents of bottle in 800 mL molecular biology grade water. Stir until well mixed, then add water to final volume of 1L. Store at 2-8°C for up to one week.

Storage Class Code

11 - Combustible Solids



Certificate of Analysis

Certificate of Origin

W Querbes et al.
Journal of virology, 80(19), 9402-9413 (2006-09-16)
Invasion of glial cells by the human polyomavirus, JC virus (JCV), leads to a rapidly progressing and uniformly fatal demyelinating disease known as progressive multifocal leukoencephalopathy. The endocytic trafficking steps used by JCV to invade cells and initiate infection are...
Tadatsura Koshika et al.
Immunology, 134(4), 386-397 (2011-11-03)
α1,3-Galactosyltransferase gene-knockout pigs transgenic for porcine cytotoxic T-lymphocyte antigen 4 immunoglobulin (pCTLA4-Ig) have been produced to reduce T-cell-mediated rejection following xenotransplantation. The level of soluble pCTLA4-Ig in their blood was greatly in excess of the therapeutic level in patients, rendering...
Xiaoli Ma et al.
BMC biochemistry, 11, 37-37 (2010-09-24)
Minichromosome maintenance proteins (Mcm) 2, 3, 4, 5, 6 and 7 are related by sequence and form a variety of complexes that unwind DNA, including Mcm4/6/7. A Mcm4/6/7 trimer forms one half of the Mcm2-7 hexameric ring and can be...
Seiichi Katayama et al.
Acta medica Okayama, 60(6), 351-355 (2006-12-27)
Clostridium perfringens is an anaerobic spore-forming pathogen of humans and animals. C. perfringens type A strains, 13, CPN50, and NCTC8237, isolated from human gas gangrene, bound specifically to human fi bronectin (Fn). The trypsin-treatment of the bacterial cells significantly reduced...
Ochratoxin A in some French wines: application of a direct competitive ELISA based on an OTA-HRP conjugate.
Radoi, A., et al.
Analytical Letters, 42, 1187-1187 (2009)


Casein Blocking Buffer for Southern or Western Blotting

Unoccupied sites on the solid support must be blocked to detect an immobilized antigen. This protocol describes how to use our Casein Blocking Buffer in Southern and Western blotting applications, including options for fluorescein and DIG detection systems.

Northern and Southern Blot Protocols & Introduction

An introduction to both Northern and Southern blotting, popular methods for the transfer of macromolecules to membranous support. This article also offers a Southern blot protocol and a northern blot protocol.

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