Abstract: In this study, an integrative array kit for rapid simultaneous determination of protein content and acidity in raw milk was developed based on formaldehyde titration and acid-base titration. The kit was composed of 4 regents. The results obtained with it, highly stable, were completely consistent with those obtained by the Kjeldahl method and acid-base titration. After 540 d of sealed dry storage, its performance remained good. This kit may be also available for the determination of protein content in sterilized milk and yogurt.

Key words: raw milk, protein content, acidity, rapid determination, kit