# 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 7.1.1: Co-chromatography

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

A sample extract is fortified by addition of an appropriate amount of a calibration solution (3.6.2). The amount of added halofuginone must be similar to the estimated amount of halofuginone found in the sample extract.
Only the height of the halofuginone peak shall be enhanced after taking into account both the amount added and the dilution of the extract. The peak width, at half of its maximum height, must be within ± 10 % of the original width.

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Source: https://www.legislation.gov.uk/eur/2009/152/annex/IV/division/D/division/7/division/7.1/division/7.1.1 (the official version)
Page: https://openlegislation.uk/eu-regulation-2009-152/annex-IV/division-D/division-7/division-7.1/division-7.1.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.