# Commission Regulation (EC) No 152/2009 of 27 January 2009 laying down the methods of sampling and analysis for the official control of feed (Text with EEA relevance), Division 9.1: Because of differences between amino acid analysers the final concentrations of the calibration solutions of standard amino acids (see 3.27.4 and 3.27.5) and of the hydrolysate (see 5.3.4) shall be taken as a guideline.

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

The range of linear response of the apparatus has to be checked for all amino acids.
The standard solution is diluted with citrate buffer to give peak areas in the middle of the range.

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Source: https://www.legislation.gov.uk/eur/2009/152/annex/III/division/F/division/9/division/9.1 (the official version)
Page: https://openlegislation.uk/eu-regulation-2009-152/annex-III/division-F/division-9/division-9.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.