# First Commission Directive of 25 October 1985 on methods of analysis for edible caseins and caseinates (85/503/EEC), Division 6.2: Test for presence of ammoniacal nitrogen

Extent: E+W+S+N.I.

If the presence of ammonium caseinate or other ammonium compounds is suspected, carry out the following test. Add to 1 gram of sample in a small conical flask 10 ml of water and 100 mg of magnesium oxide. Rinse down any magnesium oxide adhering to the walls and close the flask with a cork stopper, inserting a piece of moistened red litmus paper between the stopper and the neck of the flask. Mix the contents of the flask carefully and heat the flask in a water bath at 60 to 65 o C. If the litmus paper colours blue within 15 minutes ammonia is present, and the method is not applicable (see Section 1).

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Source: https://www.legislation.gov.uk/eudr/1985/503/annex/II/division/3/division/1/division/6/division/6.2 (the official version)
Page: https://openlegislation.uk/eu-directive-1985-503/annex-II/division-3/division-1/division-6/division-6.2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.