Immunoblotting is used to determine many important characteristics of proteins. After electrophoretic separation, proteins are transferred to a membrane and reacted with a specific antibody. The antibody-protein complex is then visualized by radiographic, chromogenic, chemiluminescent, or more recently described fluorescence detection meth- ods. Fluorescence-based detection offers some advantages over other approaches, includ- ing increased sensitivity, improved quantifiable range, and the ability to detect multiple antigens on the same blot. However, this technique is unavailable for analysis of green plant tissues by standard extraction methods because of contaminating autofluorescent pigments. We have compared 3 methods for extracting protein from plant tissue for use with infrared fluorescence-based immunoblot analysis. We report a trichloroacetic acid– acetone method that effectively eliminates autofluorescence while retaining the immuno- genicity of a target protein.
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