Hexasodium 2,2'-[vinylenebis[(3-sulphonato-4,1-phenylene)imino[6-[(2-cyanoethyl)[2-(2-hydroxyethoxy)ethyl]amino]-1,3,5-triazine-4,2-diyl]imino]]bis[benzene-1,4-disulphonate]

Hydrolysis

Description of key information

Negligible

Additional information

Hydrolysis is a common degradation route in the environment, namely the reaction of a substance with water with a net exchange of the X group with an OH at the reaction centre such that RX + H₂O → ROH + HX. Hydrolysis is often dependent upon pH as the reaction is commonly driven by hydrogen or hydroxide ions. Hydrolysis kinetics are usually determined experimentally and should be used to consider the test type and whether parent or degradation product should be tested.

Hydrolysable organic groups are in fact those groups that can react with water like Esters, Anhydrides, Amides, Carbammates, Nitriles, Cyanates, Epoxides, Halomethanes, Alkylhalides, Urea and none of these groups are present within the commonly market substance formula.

In the case of the Optical Brightener 380, hydrolysis can be considered as negligible degradation pathway due to the chemical structure and functional groups presents. Although nitriles groups are present in the molecule, they are not expected to impact and stability of the substance over long periods. The nitrile hydrolysis involves two stages: first to produce an amide and then the ammonium salt of a carboxylic acid. Under common environmental conditions (i.e. pH range 5 – 8), the reaction between nitriles and water is expected to be slow as to be completely negligible, based on the related electronegativity and polarizability.

Considering the whole chemical structure of the Optical Brightener 380, the possible hydrolysis of the nitrile moieties cannot impact neither the substance stability, nor the substance physico-chemical characterization (e.g. water solubility,. Kow, etc).