Ciliatine (2-aminoethylphosphonic acid) (76mg) was isolated from 72g of lipids of the oyster with _??_ combination of ion exchange chromatographic techniques and was identified from the results of elementary analysis, infrared spectrum, and chromatographic behaviors. The phosphonic acid was also detected in hydrolysates of a chloroform-methanol insoluble fraction of the oyster. It has been demonstrated that the oyster contains high concentration of ciliatine.
