Sulphate attack internal

Collepardi, M., Ogoumagh Olagot, J.J. In Scrivener, K., Skalny, J. (eds.) w Internal Sulphate Attack and Delayed Ettringite Formation. Proc. Int. RILEM TC 186-lSA Workshop, p. 212. Villars (2002)... 

Chondroitin 4-Sulphate Sulphatases.—The chondroitin 4-sulphate sulphatase from Proteus vulgaris preferentially attacked the sulphate group at 0-4 of the reducing 2-acetamido-2-deoxy-D-galactopyranosyl residues in the tetrasaccharides (10)— (13). The sulphate groups at 0-4 of the internal 2-acetamido-2-deoxy-D-galactopyranosyl residues in the tetrasaccharides (12) and (13) were also hydrolysed, but much more slowly. 

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