RESUMO
PURPOSE: This study aimed to investigate two readily available electrophilic reagents, acetyl chloride (AcCl), and acetic anhydride (Ac(2)O), for their potential in tissue ablation. MATERIALS AND METHODS: Reagents were diluted in diglyme as solutions up to 8 mol/L and tested in a gel phantom with NaOH solutions and ex vivo in porcine liver. Temperature, pH, and volume measurements were obtained. Infrared and gross pathological images were obtained in bisected specimens immediately after injection. RESULTS: AcCl was much more reactive than Ac(2)O and AcCl was therefore used in the tissue studies. Temperature increases of up to 37°C were noted in vitro and 30°C in ex vivo tissues using 4 mol/L AcCl solutions. Experiments at 8 mol/L were abandoned due to the extreme reactivity at this higher concentration. A change in pH of up to 4 log units was noted with 4 mol/L solutions of AcCl with slight recovery over time. Ablated volumes were consistently higher than injected volumes. CONCLUSIONS: Reaction of electrophiles in tissues shows promise as a new thermochemical ablation technique by means of only a single reagent. Further studies in this area are warranted.
Assuntos
Técnicas de Ablação/métodos , Acetatos/administração & dosagem , Anidridos Acéticos/administração & dosagem , Cloretos/administração & dosagem , Fígado/cirurgia , Acetatos/química , Ácido Acético/química , Anidridos Acéticos/química , Animais , Cloretos/química , Etilenoglicóis/química , Temperatura Alta , Concentração de Íons de Hidrogênio , Hidrólise , Éteres Metílicos/química , SuínosRESUMO
Dicloridrato de cetirizina, novo anti-histamínico H1, foi doseado volumetricamente em meio anidro com ácido perclórico e por espectrofotometria, em 232 nm. Verificou-se que ambos os métodos säo viáveis e precisos, sendo o doseamento em meio näo-aquoso mais prático por näo requerer instrumental e ser mais rápido e fácil de executar.
