O ácido acetilsalicílico (CAS 50-78-2) | também descrito como ASA | O-acetilsalicílico ou 2-acetoxibenzoico | apresenta-se como pó cristalino branco com solubilidade limitada em água e maior solubilidade em solventes orgânicos polares. Do ponto de vista analítico | mostra máxima de absorção UV próxima de 276 nm e padrões de fragmentação por espectrometria de massas compatíveis com perda do grupo acetil e do radical benzoato. Em cromatografia líquida reversa tende a retenção moderada que é sensível ao pH e à composição da fase móvel. A substância é suscetível à hidrólise e oxidação | requerendo monitoramento de pureza | manuseio cuidadoso e armazenamento em condições controladas.
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