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- W2956134491 abstract "The widespread use of immobilized metal-affinity chromatography (IMAC) for fast and efficient purification of recombinant proteins has brought potentially toxic transition elements into common laboratory usage. However, there are few studies on the leaching of metal from the affinity resin, such as nickel-nitrilotriacetic acid (Ni-NTA), with possible deleterious impact on the biological activity. This is of particular importance when reducing or chelating eluants stronger than imidazole are used. We present a detailed study of hydroxynaphthol blue (HNB) as an indicator of several divalent metal cations, but with emphasis on Ni2+, clarifying and correcting many errors and ambiguities in the older literature on this dye compound. The assay is simple and sensitive and many metals, notably Ni2+, Zn2+, Cu2+, Pb2+, Fe2+, Co2+, and Al3+, can be readily detected and quantified at concentrations down to 15–50 nM (1–5 ppb) at neutral pH and in most commonly used buffers using spectroscopic equipment available in typical biochemistry research labs. Using this method, we show that significant amounts of Ni2+ (up to 20 mM) are co-purified with a target protein (cytochrome bc1 complex) when histidine is used to elute from Ni-NTA resin." @default.
- W2956134491 created "2019-07-12" @default.
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- W2956134491 date "2019-10-01" @default.
- W2956134491 modified "2023-10-18" @default.
- W2956134491 title "Detection and quantification of transition metal leaching in metal affinity chromatography with hydroxynaphthol blue" @default.
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- W2956134491 doi "https://doi.org/10.1016/j.ab.2019.113347" @default.
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