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A non-immunological reaction causes false positives in the ring precipitation test. This occurs with calcium chelating agents and sodium ascorbate, affecting blood plasma and food analysis.

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Area of Science:

  • Biochemistry
  • Immunology
  • Food Science

Background:

  • The ring precipitation test is used for identifying antigens.
  • A commercial anti-porcine serum unexpectedly reacted with bovine plasma.

Purpose of the Study:

  • Investigate the non-immunological reaction between anti-porcine serum and bovine plasma.
  • Determine the cause of false-positive results in the ring precipitation test.

Main Methods:

  • Tested plasma treated with calcium chelating agents against normal serum.
  • Evaluated the effect of sodium ascorbate as an anticoagulant and food additive.
  • Observed reactions regardless of the species of origin of reactants.

Main Results:

  • Plasma treated with calcium chelating agents produced false-positive reactions with normal serum.
  • Sodium ascorbate also induced false-positive reactions in both anticoagulant and food additive contexts.
  • The observed reactions were confirmed to be non-immunological.

Conclusions:

  • The ring precipitation test can yield false positives due to non-immunological factors.
  • Calcium chelating agents and sodium ascorbate interfere with the test.
  • Further research is needed to elucidate the precise mechanism of this false-positive reaction.