Abstract
The aim of this work was to test a recycling method for imidazole used in immobilized metal affinity chromatography (IMAC) as eluent for recombinant histidine-tag (His-tag) protein. After evaluating two supports, the method was optimized with a mixture of bovine serum albumin, sodium chloride and imidazole. Recycling was performed with an eluate fraction from IMAC of His-tag enhanced green fluorescent protein produced in our laboratory and pure imidazole was recovered in water and was analyzed after being freeze-dried. The imidazole was then reused as eluent in IMAC without any modification in its structure or behavior. This procedure can be used for large-scale chromatography.
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