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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

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Justifications and discussions

Category definition:
Density of proteins. Enzymes are proteins and thus density for proteins are fully applicable for enzymes.
Category rationale:
Density data have been generated for various protein families. The data published in the Handbook 'Proteins: structures and molecular properties' (W.H.Freeman and Company; ISBN 0-7167-2317-4) from 1993 comes from 20 different protein families and they all have densities in the range from 1.32 g/mL to 1.42 g/mL. The density for enzymes has not been determined but since enzymes are proteins it is expected, with very high reliability that enzymes have density in the same range.