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Analysis of colloidal gold methods for labelling proteins

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Summary

The relationship between unbound and bound proteins prepared during labelling with colloidal gold (Au) was investigated. For this aim, labelled 125I-bovine serum albumin and 125I-rabbit immunoglobulin were employed. The procedures associated with the washing of the Au labelled proteins (i.e. albumin) had a marked influence on the dissociation of the bound ligand. This was most evident when the concentration of albumin that was used for labelling was too high (0.1 or 1.0 mg/ml Au sol). We suggest that purification of labelled proteins be conducted shortly before use so as to avoid a significant amount of dissociation during the time when the solution is coming to equilibrium.

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Warchol, J.B., Brelińska, R. & Herbert, D.C. Analysis of colloidal gold methods for labelling proteins. Histochemistry 76, 567–575 (1982). https://doi.org/10.1007/BF00489911

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  • DOI: https://doi.org/10.1007/BF00489911

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