Abstract
SOME applications of the polarographic technique have been made to the investigation of metal binding by proteins, especially serum albumin1–4. Tanford has shown that the polarographic behavior of thallous ion is unaffected by the presence of bovine serum albumin over a considerable pH range. As a preliminary study in a programme of work on the combination of metals with gelatin, I have examined the effect of gelatin on the polarography of thallous ion. The gelatin used was a high-grade lime processed hide gelatin, of molecular weight 79,000 (light scattering). It was carefully de-ionized to give an ash content of < 0.02 per cent. The moisture content was 12.7 per cent; protein concentrations refer to the w/v concentration of dry, ash-free protein. The polarograph used was a linear sweep cathode-ray instrument (Southern Analytical Ltd., type K1000). Polarograms were measured at 25.0° C and all potential values are corrected to the standard calomel electrode scale. Solutions were de-oxygenated with a slow stream of nitrogen. With the design of cell supplied with the polarograph, it was possible to transfer about 2 ml. of the solution under test and pass the gas at a sufficiently slow rate for the froth not to be excessive. De-oxygenation was normally satisfactorily complete in about 20 min.
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References
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RUSSELL, G. Polarography of Thallous Ion in the Presence of Gelatin. Nature 201, 920–921 (1964). https://doi.org/10.1038/201920a0
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DOI: https://doi.org/10.1038/201920a0
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