Abstract
We have developed a simple method for plasma fibronectin purification based on the well-known gelatin binding property of fibronectin. In this procedure we immobilize the melted gelatin to nitrocellulose membranes; these are then used to affinity-purify the fibronectin from the plasma sample. The fibronectin is eluted from the membrane by treatment with 8 M urea. The procedure described here gives a yield of up to 60% (from presumed fibronectin concentration) and the fibronectin obtained is homogeneous in SDS-PAGE and biologically active, as assessed by a cell migration assay. The method is rapid, simple, inexpensive, does not require the use of chromatographic equipment and is suitable for tissue culture applications.
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