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A Cobalt Schiff-Base Complex as a Putative Therapeutic for Azide Poisoning.
Chemical Research in Toxicology ( IF 3.7 ) Pub Date : 2020-01-13 , DOI: 10.1021/acs.chemrestox.9b00229
Hirunwut Praekunatham 1 , Kimberly K Garrett 1 , Yookyung Bae 1 , Andrea A Cronican 1 , Kristin L Frawley 1 , Linda L Pearce 1 , Jim Peterson 1
Affiliation  

There is presently no antidote available to treat azide poisoning. Here, the Schiff-base compound Co(II)-2,12-dimethyl-3,7,11,17-tetraazabicyclo-[11.3.1]heptadeca-1(17)2,11,13,15-pentaenyl dibromide (Co(II)N4[11.3.1]) is investigated to determine if it has the capability to antagonize azide toxicity through a decorporation mechanism. The stopped-flow kinetics of azide binding to Co(II)N4[11.3.1] in the absence of oxygen exhibited three experimentally observable phases: I (fast); II (intermediate); and III (slow). The intermediate phase II accounted for ∼70% of the overall absorbance changes, representing the major process observed, with second-order rate constants of 29 (±4) M-1 s-1 at 25 °C and 70 (±10) M-1 s-1 at 37 °C. The data demonstrated pH independence of the reaction around neutrality, suggesting the unprotonated azide anion to be the attacking species. The binding of azide to Co(II)N4[11.3.1] appears to have a complicated mechanism leading to less than ideal antidotal capability; nonetheless, this cobalt complex does protect against azide intoxication. Administration of Co(II)N4[11.3.1] at 5 min post sodium azide injection (ip) to mice resulted in a substantial decrease of righting-recovery times, 12 (±4) min, compared to controls, 40 (±8) min. In addition, only two out of seven mice "knocked down" when the antidote was administered compared to the controls given toxicant only (100% knockdown).

中文翻译:

希夫钴基复合物作为叠氮化物中毒的假定疗法。

目前尚无可用于治疗叠氮化物中毒的解毒剂。在此,席夫碱化合物Co(II)-2,12-二甲基-3,7,11,17-四氮杂双环-[11.3.1]十七碳-1(17)2,11,13,15-戊烯基二溴化物(研究了Co(II)N4 [11.3.1]),以确定其是否具有通过分解机理拮抗叠氮化物毒性的能力。在没有氧气的情况下,叠氮化物与Co(II)N4结合的停流动力学[11.3.1]表现出三个实验上可观察到的相:I(快速); I(快速)。II(中级);和III(慢)。中间相II占整个吸光度变化的〜70%,代表观察到的主要过程,在25°C和70(±10)M下的二阶速率常数为29(±4)M-1 s-1在37°C时为-1 s-1。数据表明,在中性附近,反应的pH无关性,提示未质子化的叠氮化物阴离子是攻击性物种。叠氮化物与Co(II)N4的结合[11.3.1]似乎机制复杂,导致解毒能力不理想。但是,这种钴配合物确实可以防止叠氮化物中毒。与小鼠相比,叠氮化钠注射(ip)后5分钟向小鼠给药Co(II)N4 [11.3.1]导致扶正恢复时间显着减少了12(±4)分钟,而对照组为40(±8) )分钟。另外,与仅给予有毒物的对照组相比,当施用解毒剂时,七只小鼠中只有两只被“敲低”。与小鼠相比,叠氮化钠注射(ip)后5分钟向小鼠给药Co(II)N4 [11.3.1]导致扶正恢复时间显着减少了12(±4)分钟,而对照组为40(±8) )分钟。另外,与仅给予有毒物的对照组相比,当施用解毒剂时,七只小鼠中只有两只会“敲倒”(100%敲低)。与小鼠相比,叠氮化钠注射(ip)后5分钟向小鼠给药Co(II)N4 [11.3.1]导致扶正恢复时间显着减少了12(±4)分钟,而对照组为40(±8) )分钟。另外,与仅给予有毒物的对照组相比,当施用解毒剂时,七只小鼠中只有两只被“敲低”。
更新日期:2020-01-14
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