에틸 아라키데이트, 즉 ethyl icosanoate, CAS 18281-05-5는 아라키딕산의 에틸 에스터로서, 분자식 C22H44O2, 분자량 340.58 g/mol의 장쇄 포화 지방산 에스터이다. 의약품 불순물 평가에서는 반응성 돌연변이원이라기보다 공정 유래의 에스터화 부산물 또는 지질성 오염물로 간주되는 경우가 많다. 낮은 극성과 높은 소수성은 역상 크로마토그래피에서의 유지에 유리하며, 명확한 동정은 적절한 분리 후 GC-MS, GC-FID 또는 LC-MS/MS에 의존한다. 정량 시에는 낮은 휘발성과 강한 매트릭스 분배 때문에 고온 조건이나 유도체화가 필요할 수 있다.
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