Figure 2.

Thermal stability and pH stability of PTL on the agglutinating activity were performed as described in “materials and methods” section. (A): PTL was incubated at various temperatures for 30 min then rapidly cooled on ice. The residual hemagglutination activity was tested at room temperature. The hemagglutination activity of an untreated sample, tested at room temperature, represented 100% activity. (B): PTL was incubated at room temperature (24°C) in 20 mg/ml of different pH buffers ranging from pH 3 to 12. The titer value obtained at pH 8.0 represented 100% activity.