含偶氮苯光学活性侧基聚合物研究进展

综述了含偶氮苯光学活性侧基聚合物近年来的发展概况 ,介绍了多种聚合体系的类型。由于偶氮苯光于活性侧基的存在 ,使得这些聚合物具有光致变色性、非线性光学活性、光学各向异性等光学性能 ,在光信息存储材料、非线性光学材料、液晶材料、光电子器件、生物分子活性光调控、纳米技术等诸多领域都有广泛的应用。     

羟基多壁碳纳米管分散固相萃取/气相色谱-串联质谱法测定党参中75种农药残留

基于羟基多壁碳纳米管（MWCNTs - OH）净化剂改进的分散固相萃取技术,建立了党参中75种农药残留的气相色谱－串联质谱（GC - MS/MS）检测方法。样品经乙酸乙酯提取,无水硫酸镁、乙酸钠、N-丙基乙二胺和羟基碳纳米管盐析、萃取净化后,采用气相色谱－串联质谱仪测定,动态多反应监测（dMRM）模式扫描,基质标准曲线外标法定量。75种农药在5～300 μg/L范围内线性关系良好,相关系数（r2）均不低于0.996 1。方法检出限（LOD）和定量下限（LOQ）分别为0.001～0.054 mg/kg和0.002～0.178 mg/kg,在0.025、0.05、0.20、0.50 mg/kg 4个加标水平的平均回收率为69.7%～113%,相对标准偏差（RSD,n = 4）为0.64%～6.7%。该方法操作简单、快速、准确,适用于党参中农药多残留的高通量检测。     

A modified QuEChERS-gas chromatography-mass spectrometry method for the determination of pesticide residues in Lonicera japonicae FlosEI北大核心CSCD

A modified QuEChERS-gas chromatography-mass spectrometry method using multi-walled carbon nanotubes （MWCNTs）as adsorbent was established for the determination of 72 pesticide residues in Lonicera japonicae Flos. The sample was extracted with Association of Official Agricultural Chemists （AOAC）extracting package，purified with MWCNTs-modified purification tube，analyzed with dynamic multiple reaction monitoring mode，and quantified with external standard method of matrix-matched standard curve. The 72 pesticides showed good linearities in the corresponding concentration ranges with correlation coefficients greater than 0.9936. The limits of detection were 0.001-0.178 μµg/kg，and the limits of quantitation were 0.002-0.593 μµg/kg. The average recoveries for four spiked levels ranged from 60.1% to 118.0%，with the relative standard deviations of 2.2%-17%. © 2023, Youke Publishing Co.,Ltd. All rights reserved.