El araquidato de etilo, también denominado etil icosanoato, CAS 18281-05-5, es el éster etílico del ácido araquídico y un éster de ácido graso saturado de cadena larga con fórmula C22H44O2 y peso molecular de 340.58 g/mol. En el perfil de impurezas farmacéuticas se considera por lo general un subproducto de esterificación relacionado con el proceso o un contaminante lipídico adventicio, no una especie mutagénica reactiva. Su baja polaridad y elevada hidrofobicidad favorecen la retención en sistemas de fase reversa. La identificación definitiva suele requerir GC-MS, GC-FID o LC-MS/MS tras una separación cromatográfica adecuada. La cuantificación puede exigir temperaturas elevadas o derivatización.
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