以光散射技术研究啶虫脒的测定及其与DNA的相互作用

研究了啶虫脒与脱氧核糖核酸(DNA)之间的共振光散射(RLS)增强作用。加入啶虫脒导致DNA的共振光散射增强，在316.0 nm处，存在一处共振光散射增强峰。由此建立了一种以DNA为探针检测农药啶虫脒的新方法。体系的最佳条件为，实验选择了pH 1.73为适宜酸度；加入10 μg·mL-1浓度的DNA溶液的体积为 2 mL；在室温条件下，体系的反应需要30 min达到稳定；“啶虫脒-DNA-H₂SO₄”的加药顺序为最佳。该方法适用的线性范围为0～2.25 μg·mL-1，检出限为0.2 μg·mL-1，啶虫脒在河水样品中的回收率为98.0%～102.0%，并探讨了DNA与啶虫脒的相互作用机理：啶虫脒与核酸间的相互作用包含有静电引力，啶虫脒的吡啶基与DNA碱基之间的π—π堆积作用。

Study on Determination of Acetamiprid and Interaction between Acetamiprid and Deoxyribonucleic Acid by Resonance Light Scattering

The interaction between acetamiprid and deoxyribonucleic acid (DNA) was used to determine acetamiprid by resonance light scattering (RLS). The RLS signals of DNA were greatly enhanced by acetamiprid in the spectrum region of 300-600 nm. The spectrum peak is around 316.0 nm. The optimum conditions: pH is 1.73; the concentration of DNA is 2.0 microg x mL(-1)bration curve is 0-2. 25 pg * mLU , with the detection2limit of 0. 2 ig * mL '. The acetamiprid in river water sample was determined. The results were satisfactory, and the recovery rates were in the range of 98%-106%. The interaction mechanism of acetamiprid and DNA was discussed: the interactions between acetamiprid and nucleic acid base include electrostatic effect and Tr-r cumulate effect.