分散固相萃取-高效液相色谱-质谱联用法测定水稻秸秆、糙米、稻壳和土壤中戊唑醇残留

建立了分散固相萃取-液相色谱-质谱法测定水稻秸秆、糙米、稻壳及土壤中戊唑醇残留量。方法以乙腈为萃取溶剂，N-丙基-乙二胺（PSA）为吸附剂，实现样品快速制备；在Zorbax Eclipse XDB—C18色谱柱上，以甲醇-5mmol乙酸铵缓冲溶液（70／30，V／V）为流动相，采用电喷雾质谱检测器，选择离子监测模式，以m／z308为定量检测离子，戊唑醇保留时间在9．5min左右，在0．005～2mg／L范围内浓度与峰面积呈良好的线性关系，相关系数为0．9999。在4种样本中添加不同浓度戊唑醇其平均回收率在73．6％～105．8％，相对标准偏差（n=5）小于15％，检出限（S／N=5）为2．5×10^-11g。该方法简单、快速、灵敏、准确。

Efficient approach to thiazolidinones via a one-pot three-component reaction involving 2-amino-1-phenylethanone hydrochloride,aldehyde and mercaptoacetic acid

A highly efficient three-component reaction has been developed for the synthesis of thiazolidinones involving the reaction of 2-amino-l-phenylethanone hydrochloride with an aromatic aldehyde and mercaptoacetic acid in the presence of diisopropylethylamine in a single pot.Critically,this reaction exhibited excellent chemoselectivity,with the nitrogen atom of the 2-amino-l-phenylethanone component reacting selectively with the aromatic aldehyde to give the corresponding Schiff base.Nucleophilic attack at the carbon of the Schiff base by the sulfur atom of mercaptoacetic,followed by a cyclocondensation reaction between the nitrogen and the carboxylic acid moiety afforded the desired thiazolidinones,which were fully characterized by spectroscopic techniques.

长链烷基酯改性氨基硅烷偶联剂及其应用探究

以N-[3-(三甲氧基硅基)丙基]乙二胺(KH792)、十八酸正丁酯、正丁醇为原料,制备了一种长链烷基酯改性氨基硅烷偶联剂,并对其结构进行了表征;还将其用于脱甲醇型透明胶粘剂的制备,探究了改性氨基硅烷偶联剂对脱甲醇型透明胶粘剂力学性能、耐热抗黄变性能及对玻璃、PET塑料、PC塑料、阳极氧化铝型材粘接性能的影响。结果表明:KH792经十八酸正丁酯改性后,—NH2变为活性稍低的—CONH—,虽然氨基活性有所减弱,但是仍然对胶粘剂的表干加快和交联密度提升起到促进作用;但因没有活性质子,碱性减弱,并且具有除水功能,因而可提高胶粘剂的耐黄变及储存稳定性。长链烷基酯改性氨基硅烷偶联剂对大多数基材具有较好的粘接效果,尤其是对非极性材质的塑料表现出优越的粘接性能。