English translation: determination by high-performance liquid chromatography
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GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
German term or phrase:
determination by high-performance liquid chromatography
Explanation: That's the procedure/method (Hochflüssigkeitschromatographie, more commonly termed Hochleistungschromatographie), and you could say something along the lines of "a Bayer employee performing/carrying out high-performance liquid chromatography" or "a Bayer employee performing/carrying out HPLC testing".