Biuret test A test for the presence of proteins, in which sodium bydroxide is added to the test solution, followed by drops of 1% copper(II) sulfate solution.

• 双缩脲试验：鉴定蛋白质存在的试验。在待检测溶液中加入氢氧化钠，然后滴加1%25硫酸铜（二价）溶液。