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C7594

Sigma-Aldrich

Casein Blocking Buffer

for Northern and Southern blotting, powder blend

Synonym(s):

blocking buffer

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About This Item

EC Number:
232-555-1
UNSPSC Code:
12161700
NACRES:
NA.25

grade

for molecular biology

Quality Level

200

form

powder blend

technique(s)

Southern blotting: suitable

pH

6.8-7.2(reconstituted per directions)

solubility

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.

Application

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.

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Storage Class Code

11 - Combustible Solids

WGK

WGK 1

Certificates of Analysis (COA)

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Protocols

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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