A heavy-atom derivative of CHCA, a primary matrix molecule for matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS), is synthesized and purified. This new matrix molecule α-cyano-4-hydroxy-3-iodocinnamic acid (CHICA) is characterized by 1H NMR and mass spectrometry. CHICA is shown to increase MALDI-MS yield for the test analytes human angiotensin II and sex pheromone inhibitor as compared to both CHCA and an alternative heavy-atom CHCA derivative matrix. An optimal CHICA matrix concentration is determined to be 4 mg/mL. Analyte ion yield is shown to be comparable for CHICA and CHCA for analyte concentrations below 0.001 mg/mL. For analyte concentrations above this threshold, use of CHICA resulted in higher analyte yield and significantly lower relative standard deviation.
合成并纯化了一种 CHCA 的重原子衍
生物,它是基质辅助激光解吸电离质谱(MALDI-MS)的主要基质分子。这种新的基质分子 α-
氰基-
4-羟基-3-
碘肉桂酸(CHICA)通过 1H NMR 和质谱法进行表征。与 CHCA 和另一种重原子 CHCA 衍
生物基质相比,CHICA 能提高 MALDI-MS 对测试分析物人
血管紧张素 II 和性信息素
抑制剂的检出率。确定 CHICA 基质的最佳浓度为 4 毫克/毫升。在分析物浓度低于 0.001 毫克/毫升时,CHICA 和 CHCA 的分析物离子产量相当。在分析物浓度高于此阈值时,使用 CHICA 可获得更高的分析物产率,相对标准偏差也显著降低。