Metrology for protein content measurement in food

Anton Petrenko, Serhii Kulyk, Oleksandr Lameko, Volodymyr Melnyk, Liudmyla Ovchar, Oleksandra Manska, Olena Shcherbakova, Oleksandr Melnykov

Abstract

Suggestions for establishing metrological traceability and respect metrological traceability chain scheme for protein content measurements in food are presented. The most common methods for determining protein content in organic and inorganic substances are reviewed. Particular attention is given to the Kjeldahl method. A method is proposed for ensuring metrological traceability of the Kjeldahl method results through the use of 2-amino-2-(hydroxymethyl)-1,3-propanediol (Tris base) and hydrochloric or sulfuric acid solutions, whose concentrations are traceable to a primary method—constant current coulometry. A constant current coulometry measurement system has been developed at the Ukrainian DI UMTS and is described in this paper.

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IMEKO-TC8-11-24-2025-017.pdf

DOI

10.21014/tc8-2025.017

IMEKO TC

TC8 - Traceability in Metrology

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