Abstract
Five kinds of malarial antigens were characterized in extracts of infected human placental blood. Their storage properties were investigated. L-antigens were labile to heating at 55°C and La 1-antigens could be selectively destroyed in this way. In contrast, S-antigens and some normal serum glycoproteins remained in solution after boiling. The antigenicity, electrophoretic mobility and microheterogeneity of boiled S-antigens was intact. The various antigens were poorly separated on Sephadex G—200 but one was separated from the others by DEAE cellulose chromatography. La 1-antigen appeared to aggregate under conditions of low ionic strength and was fractionated by differential ultra-centrifugation.
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