RESUMEN
An 8-step preparation of 14 C-labelled CHF6001, a potent phosphodiesterase 4 inhibitor in the treatment of respiratory diseases, is described. An overall yield of approximately 9% was obtained starting from copper[14 C]cyanide. The synthesis of a stable labelled version of CHF6001 is also reported using the commercially available trideuterated bromomethylcyclopropane as starting material.
Asunto(s)
Radioisótopos de Carbono/química , Fosfodiesterasas de Nucleótidos Cíclicos Tipo 4/metabolismo , Deuterio/química , Inhibidores de Fosfodiesterasa 4/química , Inhibidores de Fosfodiesterasa 4/síntesis química , Sulfonamidas/química , Sulfonamidas/síntesis química , para-Aminobenzoatos/química , para-Aminobenzoatos/síntesis química , Técnicas de Química Sintética , Marcaje Isotópico , Inhibidores de Fosfodiesterasa 4/farmacología , Sulfonamidas/farmacología , para-Aminobenzoatos/farmacologíaRESUMEN
Identification of human remains can be hindered by several factors (e.g., traumatic mutilation, carbonization or decomposition). Moreover, in some criminal cases, offenders may purposely adopt various expedients to thwart the victim's identification, including the dissolution of body tissues by the use of corrosive reagents, as repeatedly reported in the past for Mafia-related murders. By means of an animal model, namely porcine samples, we evaluated standard DNA typing as a method for identifying soft (muscle) and hard (bone and teeth) tissues immersed in strong acids (hydrochloric, nitric and sulfuric acid) or in mixtures of acids (aqua regia). Samples were tested at different time intervals, ranging between 2 and 6h (soft tissues) and 2-28 days (hard tissues). It was shown that, in every type of acid, complete degradation of the DNA extracted from soft tissues preceded tissue dissolution and could be observed within 4h of immersion. Conversely, high molecular weight DNA amenable to STR analysis could be isolated from hard tissues as long as cortical bone fragments were still present (28 days for sulfuric acid, 7 days for nitric acid, 2 days for hydrochloric acid and aqua regia), or the integrity of the dental pulp chamber was preserved (7 days, in sulfuric acid only). The results indicate that DNA profiling of acid-treated body parts (in particular, cortical bone) is still feasible at advanced stages of corrosion, even when the morphological methods used in forensic anthropology and odontology can no longer be applied for identification purposes.
Asunto(s)
Ácidos , Huesos/química , Dermatoglifia del ADN/métodos , Antropología Forense , Modelos Animales , Diente/química , Animales , ADN/análisis , Reacción en Cadena de la Polimerasa , PorcinosRESUMEN
The degradation of Methyl Orange (C(14)H(14)N(3)SO(3)Na), chosen as a model sulfonated azo dye, was investigated in aqueous solutions containing suspended polycrystalline TiO(2) particles under irradiation with simulated sunlight. The dye disappearance and the formation of the mineralization end products were monitored; the formation of the main transient intermediates was also examined in detail. Particular attention was devoted to the identification and to the evolution of fragments retaining the chromophoric group. The comparison of data coming from various analytical techniques led to a possible reaction mechanism for the degradation process, giving insight into an aspect of the treatment which has not been considered in previous studies.