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Diclofenac is a widely used drug against fever, inflammation, pain, and rheumatic diseases. An average of 70 % of the ingested diclofenac is excreted in the urine. Thus, 63 tons are introduced into the water cycle in Germany. Due to insufficient removal of diclofenac in wastewater treatment plants, residues of diclofenac can be found in surface water and sometimes in drinking water It exist a polyclonal against diclofenac and monoclonal antibodies against diclofenac and it`s metabolites. There all based on direct couling of diclofenac on proteins via carboxylic functions. However it was imagined advantageous to introduce a heterobifunctional spacer between the analyte and the carrier protein.
Aceclofeac is commercial available. All other spacers can only be introduced with solid phase synthesis.