Tag Archives: blood test

Electrophoresis Test

By @forensicfield

What is Electrophoresis Test?

Electrophoresis is being used for the separation of various enzyme system.

There are two type of electrophoretic method have been recommended for identification of blood stains;-

  • 1] Separation and identification of hemoglobin by electrophoresis, and,
  • 2] Separation and identification of serum proteins by immunoelectrophoresis.

Immunoelectrophoresis is a two‐stage process:

  • 1.} Electrophoresis is conducted, and;
  • 2.} Immunoprecipitation using antibodies against specific proteins.

Resolution is improved by staining the proteins.

The technique is widely used to identify monoclonal immunoglobulins (M‐components) in serum and urine.

It’s Uses In Forensics

It’s a Confirmatory test for blood.

Basis Of The Test

This process involves the separation of Marker Proteins that are found on the surface of red blood cells.

Indication for the Presence of Blood

Electrophoresis  can be used to isolate and compare DNA, Blood proteins and inorganic substances.

How To Perform This Test ?

For Analyzing of Proteins

Drawbacks

The disadvantages are that gels can melt during electrophoresis, the buffer can become exhausted, and different forms of genetic material may run in unpredictable forms.

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Teichmann Crystal Test

By @forensicfield

What is Teichmann Crystal Test?

Dr. Ludwig Karl Teichman discovered a test for detection of blood in 1853. later the test name as Teichmann Crystal Test.

It’s Uses In Forensics

It’s a Confirmatory test for blood.

It is also known as Haematin crystal acid test or haemin test.

It is used in detection of blood from dried stains.

Basis Of The Test

In Teichmann Test hemoglobin converted to haemin crystals which converted to salt in presence of halogen after then rhombic crystals forms.

Indication for the Presence of Blood

It produced Dark brown Color and rhombic shape if blood is present.

How To Perform This Test ?

Drawbacks

Rust and Exposure or combination of these can interfere with the test.

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