RUAS
Department of Biotechnology (2021-22)
Immunology and Molecular
Biology Laboratory
Experiment 2
ROCKET IMMUNOELECTROPHORESIS
Introduction:
Rocket Immunoelectrophoresis, also known as electro-immunodiffusion, is a simple, quick and
reproducible method for determining the concentration of antigen in an unknown sample. This
quantitative one dimensional immunoelectrophoresis method involves a comparison of antigen
sample of unknown concentration with a series of dilutions of a known concentration of the antigen
and requires a monospecific antibody against the antigen under investigation. In this method,
antigen migrates from the well through agarose gel containing antiserum, forming rocket shaped
precipitin peaks. The height of this peak is proportional to the concentration of the antigen loaded in
the corresponding well.
Aim:
Principle:
RUAS
Department of Biotechnology (2021-22)
Immunology and Molecular Biology Laboratory
Fig 1: The higher the concentration of antigen loaded in the well, the further it will migrate
through the gel before it interacts with sufficient antibody to form precipitin peaks
Materials Required:
Procedure:
RUAS
Department of Biotechnology (2021-22)
Immunology and Molecular Biology Laboratory
1.
Prepare 15 ml of 1 % agarose (as given in important instructions).
2.
Cool the solution to 55-60
o
C and add 250 𝜇l of antiserum to 13 ml of agarose solution. Mix well
for uniform distribution of antibody.
3.
Pour agarose solution containing the antiserum on to a grease free glass plate placed on a
horizontal surface. Allow the gel to set for 30 minutes.
4.
Place the glass plate on the template provided.
5.
Punch wells with the help of gel puncher. Use gentle suction to avoid forming rugged wells.
6.
Add 10 μl of the given standard antigen and test antigen samples to the wells.
A.
Standard Antigen A (1.87 mg/ml)
B.
Standard Antigen B (0.94 mg/ml)
C.
Standard Antigen C (0.47 mg/ml)
D.
Standard Antigen D (0.23 mg/ml)
E.
Test Antigen 1 F. Test Antigen 2
7.
Pour 1X TBE buffer into the electrophoresis tank such that it just covers the gel.
Note: The remaining 1X TBE buffer can be stored at room temperature.
8.
Electrophorese at 80-120 volts and 60-70 mA, until the blue dye travels 3-4 cm from the well.
Do not electrophorese beyond 3 hours, as it is likely to generate heat.
Observation and Graph :
RUAS
Department of Biotechnology (2021-22)
Immunology and Molecular Biology Laboratory
Result:
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