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El método de fraccionamiento con detergentes descrito por Rambsy y Makowski en 1999, fue modificado utilizando un buffer con digitonina (0,015%) para permeabilizar células HTR8/SVneo de trofoblasto humano, extrayendo las proteínas de citoplasma en la fracción soluble y solubilizando las de membrana a partir del precipitado con un buffer con Tritón X-100 (0,5%). Se obtuvo un extracto reproducible de proteínas citoplasmáticas libre de proteínas de membrana y se adecuó para electroforesis bidimensional (2-DE) por precipitación con clorofomo/metanol. En conclusión, el método aquí descrito resulta adecuado para la obtención de sub-proteomas de citoplasma a partir de líneas celulares, con una reproducibilidad y recuperación óptimas para el análisis de perfiles proteómicos por electroforesis bidimensional.
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