Kartik Sharma, a class XII student, completed a chemistry project on analyzing the quantity of casein in different milk samples. The project involved precipitating casein from cow, buffalo and goat milk using ammonium sulfate and acetic acid solutions. Measurements were then taken of the mass of casein precipitate from each milk type. The results showed that goat milk contained the highest percentage of casein at 3.67%, followed by buffalo milk at 2.73% and cow milk at 1.64%. The project demonstrated that different milk samples contain varying amounts of the protein casein.