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Imidazolidinyl urea

Chemical Formula:



White powder. Highly soluble, hygroscopic.


Imidazolidinyl urea kills Gram-negative bacteria. It acts synergistically with the parabens to provide a broad-spectrum antibiotic effective against molds, yeast, and bacteria.

The combination of the two is the most widely used preservative in cosmetics.

It works by releasing formaldehyde into the product, like the related preservative DMDM hydantoin.

Imidazolidinyl urea: InChI=1/C11H16N8O8/c20-2-18-4(6(22)16-10(18)26)14-8(24)12-1-13-9(25)15-5-7(23)17-11(27)19(5)3-21/h4-5,20-21H,1-3H2,(H2,12,14,24)(H2,13,15,25)(H,16,22,26)(H,17,23,27)/f/h12-17H

allantoin: InChI=1/C4H6N4O3/c5-3(10)6-1-2(9)8-4(11)7-1/h1H,(H3,5,6,10)(H2,7,8,9,11)/f/h6-8H,5H2

DMDM Hydantoin: InChI=1/C7H12N2O4/c1-7(2)5(12)8(3-10)6(13)9(7)4-11/h10-11H,3-4H2,1-2H3

By Simon Quellen Field
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