Fast Casein Test

Hi,

Reasoning that rennet will set mainly casein and that the whey proteins will be free to run away with the whey(hey, it rhymes!) I have thought of using this to determine the casein content of milk.
This with a cheap little milk analyser like an Ekomilk. I would test the milk protein and then set the milk with rennet and then put the resulting whey through the Ekomilk. Subtracting the 2 figures from each other would then theoretically give the casein content of the milk.
Well, this sounds logical to me, but that does not say a lot and I don’t know how that would compare to a Kjeldahl determination, which would be the official way of doing it.
May be a project for a rainy day. Any comments?

See ya!
Leon the Milkman