碱性橙21、22和罗丹明B的多级质谱裂解规律探析

Study on the Fragmentation Pathways of Astrazon Orange G,Astrazon Orange R and Rhodamine B by ESI-MSn

采用电喷雾离子阱多级质谱技术(ESI-MSn)在正离子模式下(ESI+)对食品中常见的几种非法添加工业染料碱性橙21、22和罗丹明B进行裂解规律探析。分析了这3种染料从分子离子出发的多级质谱裂解碎片,发现此类化合物容易先失去Cl-,形成N+离子;在电离源的轰击下,容易失去.CH3和.CH2CH3;并且探析了碱性橙21、22和罗丹明B的多级质谱裂解规律。该质谱裂解规律有助于推断碱性工业染料及其类似物的结构特点和裂解规律,为此类化合物的快速鉴定提供依据。

To investigate the fragmentation pathways of astrazon orange G, astrazon orange R and rhodamine B, which are often illegally added into foods, electrospray ionization-ion trap mass spectrometry（ESI-MSn）were applied. In positive mode, the characteristic ESI- MSn fragmentation pattern of the three dyes was discussed. It shows that the eliminations of · CH3 and · CH2CHa and the generation of N＋ are the common fragmentation pathways of the three dyes. The results may help to deduce the structures of basic industrial dyes according to their structural characteristics and lost fragmentations. It also can provide theoretical knowledge of the rapid identification of structural analysis of basic dyes.