有机磷水解酶-聚β-环糊精作为一种稳定的自净化生物催化材料,用于吸附和降解有机磷农药。
Organophosphorus hydrolase-poly-β-cyclodextrin as a stable self-decontaminating bio-catalytic material for sorption and degradation of organophosphate pesticide.
机构信息
School of Mechanical Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do, 16419, Republic of Korea.
Korea Institute of Science and Technology, Seoul, Republic of Korea.
出版信息
J Hazard Mater. 2019 Mar 5;365:261-269. doi: 10.1016/j.jhazmat.2018.10.094. Epub 2018 Nov 2.
A region suffering from an attack of a nerve agent requires not only a highly sorptive material but also a fast-acting catalyst to decontaminate the lethal chemical present. The product should be capable of high sorptive capacity, selectivity and quick response time to neutralize the long lasting harmful effects of nerve agents. Herein, we have utilized organophosphorus hydrolase (OPH) as a non-toxic bio-catalytic material held in with the supporting matrix of poly-β-cyclodextrin (PCD) as a novel sorptive reinforced self-decontaminating material against organophosphate intoxication. OPH coated PCD (OPH-PCD) will not only be providing support for holding enzyme but also would be adsorbing methyl paraoxon (MPO) used as a simulant, in a host-guest inclusion complex formation. Sorption trend for PCD revealed preference towards the more hydrophobic MPO against para-nitrophenol (pNP). The results show sorption capacity of 1.26 mg/g of 100 μM MPO with PCD which was 1.7 times higher compared to pNP. The reaction rate with immobilized OPH-PCD was found to be 23% less compared to free enzyme. With the help of OPH-PCD, continuous hydrolysis (100%) of MPO into pNP was observed for a period of 24 h through packed bed reactor with good reproducibility and stability of enzyme. The long-term stability also confirmed its stable nature for the investigation period of 4 days where it maintained activity. Combined with its fast and reactive nature, the resulting self-decontaminating regenerating material provides a promising strategy for the neutralization of nerve agents and preserving the environment.
遭受神经毒剂袭击的区域不仅需要高吸附材料,还需要快速作用的催化剂来净化存在的致命化学物质。该产品应具有高吸附能力、选择性和快速响应时间,以中和神经毒剂的持久有害影响。在此,我们利用有机磷水解酶(OPH)作为无毒的生物催化材料,与聚-β-环糊精(PCD)的支撑基质结合,作为一种新型的吸附增强型自解毒材料,用于抵御有机磷中毒。OPH 涂层 PCD(OPH-PCD)不仅为酶提供支撑,还将通过主客体包合络合形成吸附甲基对氧磷(MPO)作为模拟物。PCD 的吸附趋势表明,对更疏水的 MPO 具有偏好性,而对对硝基苯酚(pNP)则没有。结果表明,PCD 对 100 μM MPO 的吸附容量为 1.26 mg/g,比 pNP 高 1.7 倍。与游离酶相比,固定化 OPH-PCD 的反应速率降低了 23%。在 OPH-PCD 的帮助下,通过填充床反应器观察到 MPO 连续水解(100%)成 pNP,持续 24 小时,具有良好的重现性和酶稳定性。长期稳定性也证实了其在 4 天的研究期间保持活性的稳定特性。结合其快速和反应性的特点,这种自解毒再生材料为神经毒剂的中和和环境保护提供了一种有前途的策略。