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Oxidation of bisphenol A by permanganate: Reaction kinetics and removal of estrogenic activity

机译:高锰酸盐氧化双酚A:反应动力学和去除雌激素活性

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The kinetics for reaction between bisphenol A (BPA) and permanganate was examined over pH range of 5.0-9.9 and the estrogenic activity of aqueous BPA solution after oxidation was assessed by yeast two-hybrid assay. Reaction kinetics follows the second-order rate law, with the apparent second-order rate constant of 15.1 ±1.1 M~(-1) s~(-1) at pH 6.0 and 25°C and the activation energy of 48.7 kJ/mol. The kinetics exhibits pH dependency and the specific rate constants related to speciation of BPA are 50 ± 28 M~(-1)s~(-1), 9.6 (±0.6)103M~(-1)s~(-1) and 1.4 (±0.1)10~4M~(-1)s~(-1) for BPA, BPA- and BPA~(2-), respectively. The results of the estrogenic/antiestrogenic activity test show that there is a hysteresis for the removal of estrogenic activity of aqueous BPA solution at pH 7.3. Removal of BPA is completed in 10 min, but complete removal of estrogenic activity requires a further 20 min.
机译:在5.0-9.9的pH范围内检查了双酚A(BPA)和高锰酸盐之间的反应动力学,并通过酵母双杂交法评估了氧化后的BPA水溶液的雌激素活性。反应动力学遵循二级速率定律,在pH 6.0和25°C下,表观二级速率常数为15.1±1.1 M〜(-1)s〜(-1),活化能为48.7 kJ / mol 。动力学表现出pH依赖性,与BPA形态有关的比速率常数为50±28 M〜(-1)s〜(-1),9.6(±0.6)103M〜(-1)s〜(-1)和对于BPA,BPA-和BPA〜(2-),分别为1.4(±0.1)10〜4M〜(-1)s〜(-1)。雌激素/抗雌激素活性试验的结果表明,在pH 7.3下,去除BPA水溶液的雌激素活性存在滞后现象。 BPA的清除在10分钟内完成,但是雌激素活性的完全清除还需要20分钟。

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