BIOCHEMICAL STUDIES ON SO-CALLED SYPHILIS ANTIGEN

Area of Science:

• Biochemistry
• Immunology
• Analytical Chemistry

Background:

• Liver tissues contain diverse substances extractable by alcohol.
• Antigenic properties are concentrated in specific fractions of these extracts.
• Fractionation is crucial for isolating active components for diagnostic reagents.

Purpose of the Study:

• To fractionate alcoholic liver extracts and identify components with antigenic properties.
• To evaluate the biological activity and suitability of different fractions as antigens.
• To recommend the optimal fraction for antigen preparation, particularly for the Wassermann reaction.

Main Methods:

• Alcoholic extraction of liver tissues from humans and animals.
• Fractionation of extracts based on solubility in ether, alcohol, and acetone.
• Biological evaluation including hemolytic, anticomplementary, and antigenic property assessment.

Main Results:

• Four distinct fractions were isolated based on solubility.
• Fractions insoluble in ether and hot alcohol (proteins, salts) were unsuitable due to complement binding.
• Fractions soluble in ether and alcohol (soaps, bile salts) were hemolytic and had weak antigenicity.
• Fractions soluble in ether, alcohol, and acetone (lipoids) showed variable hemolytic and antigenic properties.
• Fractions insoluble in acetone (phosphatids) demonstrated the most consistent and potent antigenic properties, despite occasional anticomplementary activity.

Conclusions:

• The aceton-insoluble fraction, primarily containing phosphatids, is the most suitable for antigen preparation.
• This fraction exhibits strong antigenic properties and is recommended for diagnostic use, such as in the Noguchi method for syphilis.
• Further analysis of phosphatids within this fraction is warranted.