2-(苯并吖啶酮)-乙基咪唑酸酯探针对荧光和质谱的双增敏作用

采用3种不同衍生方法对胺类化合物进行标记,比较衍生效率的差别,给出最优方法:5-(2-羟乙基)-(苯并吖啶酮与N,N-羰基双咪唑(CDI)缩合形成的双敏感探针2-(苯并吖啶酮)-乙基咪唑酸酯(BAEIC)与胺的衍生效率最高,产物稳定。BAEIC在N,N-二甲基甲酰胺(DMF)溶剂中以4-二甲氨基吡啶(DMAP)为催化剂,在80℃条件下与胺反应生成的亲核取代物,不仅表现出强烈的荧光,同时具有很强的质谱离子化能力。估算了衍生物在乙腈和甲醇水溶液中百分离子化值δ在5.62%～58.08%和2.14%～56.58%范围内。本方法具有良好的重现性,激发和发射波长为λex/λem=280/510nm,荧光检出限为0.12～0.59μg/L(8.6～79fmol);在线APCI-MS检出限为1.9～14μg/L(544～825fmol)。

Dual-Sensitive Probe of 2-( Benzoacridin) ethyl-imidazole-1-carboxylate for Determination of Aliphatic Amine with Fluorescence and Online Atmospheric Pressure Chemical Ionization Mass Spectrometry Identification

With comparison of three different methods for the marking of amines compound, an optimal deri vatization method was selected.5-(2-Hydroxyethyl) benzoacridine (HBA) reacts with coupling agent N,N'-carbonyldiimidazole(CDI) to form an activated amide intermediate 2-(benzoacridin) ethyl-imidazole-1-carbox-ylate(BAEIC).BAEIC, which is dual-sensitive probe, reacts preferably with amino compounds at 80 ℃ in the presence of 4-dimethylaminopyridine(DMAP) catalyst in N,N-dimethylformamide(DMF) solvent to give the corresponding sensitively fluorescent derivatives with an excitation maximum at λ_(ex) of 280 nm and an emis sion maximum at λ_(em) of 510 nm.BAEIC-amine derivatives simultaneously exhibited high ionization potential with percent ionization (changing from 5.62% to 58.08% in aqueous acetonitrile and from 2.14% to 56.58% in aqueous methanol.Derivatives were not only sensitive to fluorescence but also to MS ionizable potential.The fluorescence detection limits(5/iV = 3) were 0.12-0.59 μg/L.The online APCI-MS detection limits were 1.9-14 μg/L(S/N=5).