The contents of protein were determined using both "GB/T 5009.5 determination of protein in foods" method and "NY/T 1678 determination of protein in milk and dairy products with Biuret spectrophotometry" method,after adding non-protein nitrogen in milk and dairy products.It is shown from the results that GB/T 5009.5 method can not distinguish between protein nitrogen and non-protein nitrogen.Compared with the GB/T 5009.5 method,the NY/T 1678 method can determined the contents of protein accurately after adding melamine and Urea or Proteinum hydrolysatum in milk and dairy products.The method is accurate,simple and rapid.
标题:人为添加非蛋白质氮乳与乳制品中蛋白质含量测定方法的研究
英文标题:Research on the methods of protein determination after added non-protein in milk and dairy products