Sulphate esters, sulphonic acids, and sulpholipids

In soils nearly 50% of the total sulphur is found in the hydroiodic acid reducible fraction , consisting of sulphate esters, which are probably in part polysaccharide sulphates (e.g. condroitin sulphate), keratin sulphates, choline sulphate, and arylsulphates (Zinder and Brock, 1978b). The heteropolysaccharide sulphates, which are also reported from msirine species (e.g. Torres-Pombo et al., 1969 Abdel-Fattah et al., 1973 Batey and Turvey, 1975), serve mainly as structural materials reaccessible to the marine sulphur cycle as SO , depending on the ability of microorganisms, plants, and mammals to produce enzymes (sulphhydrolases) to hydrolyze these esters (Fitzgerald, 1978). 

Sulpholipids of various chemical composition have been isolated from diatoms (e.g. Anderson et al., 1975). Mono- and polyester glycosyl sulphates or phosphate diglycerides account for a group of polar lipids which are found in large amounts in certain Fucaceae (Liem and Laur, 1976). 

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