Colorimetric and test determination of tetracycline and doxycycline in milk and milk products after sorption concentration at chemically modified aluminosilicate

A technique of colorimetric and test determination through reaction with iron(III) on the surface of chemically modified aluminosilicate for tetracycline and doxycycline was developed. The advantages of the technique are its rapidity, ease of performance, affordability, and good metrological characteristics. The method could be used in laboratories that perform chemical analysis of foodstuffs.