This method allows the determination of total copper concentration in white wine. It utilises the colorimetric reagent 2,2′-bicinchoninic acid dipotassium salt (BCA) to react with copper(I) and form a purpled coloured complex, which absorbs at 563 nm. During the analysis, ascorbic acid is added to aid the conversion of copper(II) to copper(I). Also, silver(I) nitrate is added in order to induce dissociation of suspended copper(I) sulfide in wine, and thereby to provide non-sulfide bound copper ions and silver(I) sulfide.
|Number of pages||4|
|Publication status||Published - 2018|