What times and temperatures should I set on my Kjeldahl to determine the protein in the IDF/SDF filter bags?

We have found that it is best to slowly ramp up the digestion temperatures so that foaming in the digestion tubes is minimized. As a result, we would suggest the following times and temperatures: 15 minutes at 150°C, followed by 15 minutes at 250°C, followed by 15 minutes at 350°C, and finally 40 minutes at 420°C.