DETERMINATION OF ANIONS OF MILK BY ION CHROMATOGRAPHY

The anions of milk have been successfully analysed by ion chromatograp hy coupled with suppressed conductivity detection. With an appropriate sample preparation (ultrafiltration alone, or combined with dry miner alization), this method enabled simultaneous identification and quanti fication of chloride, phosphate and citrate ions with good repeatabili ty (relative standard deviations of about 1%). Moreover, good sensibil ity (less than 20 mu g/kg) and no interference between ions and other matrix components were determined. It was also shown that this method offers a very promising alternative for studying changes in the salt b alance of milk during some technological treatments (acidification and increase of ionic strength of milk).