Inclusion Effect of Alpha-Cyclodextrin on Chemical Degradation of Malathionin Water
Inclusion Effect of Alpha-Cyclodextrin on Chemical Degradation of Malathionin Water
复制标题
α-环糊精对马拉硫磷水化学降解的包合作用
DOI：
10.1007/s00244-007-9055-8
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发表时间：
2008
影响因子：
4
通讯作者：
Weiping Liu
中科院分区：
文献类型：
--
作者：
Anping Zhang;Weiping Liu
马拉硫磷在水中的化学降解是马拉硫磷的重要环境过程之一，在马拉硫磷的解毒过程中起着关键作用。α-环糊精（α-CD）是一种环状低聚糖，在葡萄糖单元、溶解性和空腔大小等方面与β-环糊精（β-CD）不同，它能产生与β-CD及其衍生物不同的环境效应。本研究以α-环糊精（α-CD）为催化剂，研究了α-CD对马拉硫磷在水中的化学降解作用，旨在进一步研究不同CD对马拉硫磷水解的影响，并探讨α-CD在马拉硫磷污染修复中的应用前景。结果表明，在缓冲溶液和天然沃茨中，α-CD对马拉硫磷的水解均有显著的促进作用。α-CD的促进作用与pH值呈正相关，与温度呈负相关。马拉硫磷在两种沃茨中的水解速率常数均随α-CD浓度的增加而增大。在25°C和pH 9.0条件下，广泛用于农业的化合物尿素可降低α-CD的促进作用。核磁共振研究表明α-CD与马拉硫磷形成了包合物。
Chemical degradation of malathion in water is one of the important environmental processes of malathion, and plays a critical role in detoxification of malathion. Alpha-cyclodextrin (α-CD), one of the cyclic oligosaccharides different from beta-cyclodextrin (β-CD) in glucose units, solubility, and size of cavity, is capable of producing an environmental effect different from those of the latter CD and its derivatives. This work evaluated the effect of α-CD on chemical degradation of malathion in water in an attempt to further study the effects of different CDs on hydrolysis of malathion and assess the potential applications of α-CD in remediation of malathion contamination. The results showed that α-CD had a remarkable facilitative effect on the hydrolysis of malathion in both buffer solutions and natural surface waters. The facilitative effects of α-CD were an obverse function of pH value and inverse function of temperature. The rate constant of malathion hydrolysis increased with increasing the concentration of α-CD in both types of waters. Urea, a compound widely used in agriculture, decreased the facilitative effect of α-CD at 25°C and pH 9.0. The formation of inclusion complexes between α-CD and malathion was evidenced by nuclear magnetic resonance studies.