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Obtaining Highly Purified Toxoplasma gondii Oocysts by a Discontinuous Cesium Chloride Gradient
Published on: November 3, 2009
Purification of Toxoplasma gondii oocysts by cesium chloride gradient
Aurélien Dumètre1, Marie-Laure Dardé
1UPRES EA 3174, Neuroparasitologie et neuroépidémiologie tropicale, Faculté de Médecine, 2 Rue du Dr Marcland, F-87025 Limoges, France.
Abstract:
We describe the use of a cesium chloride (CsCl) gradient as an improvement for the purification of Toxoplasma gondii oocysts from concentrated suspensions. After concentration by sucrose flotation, this technique gives a > 96% recovery of very pure unsporulated or sporulated oocysts, but requires "fresh" oocysts (< or = 10 weeks of age). This material is suitable for biochemical and immunological analyses of environmentally resistant T. gondii oocysts.

