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在反尼尔型的双聚焦质谱计(MAT311)上,保持磁场强度及加速电压不变,进行电场电压扫描,可获得DADI(Direct analysis of daughter ions,子离子直接分析)谱,后者指示由某一质量的母离子直接裂解产生的各子离子的质量及强度。作者用 DADI 技术对棉酚六甲醚(HMEG)的三种互变异构混合物作定量测定。从分子离子(M=602)开始扫描,在谱中可以观察到各子离子 m/z 587(M-CH_3),571(M-CH_3O),556(M-CH_3-H_3O)和540(M-2CH_(?)O)峰,双醛型(Ⅰ)、双邻羟基内醚型(Ⅱ)和单醛-单邻羟基内醚型(Ⅲ)HMEG 的纯品,依其结构不同,分别可以给出不同
In the NIR-type dual-focus mass spectrometer (MAT311), DADI (Direct analysis of daughter ions) spectra were obtained by maintaining the field strength and accelerating voltage while scanning with an electric field voltage. The latter indicated that The mass and intensity of each ion produced by the direct cleavage of a precursor of a certain mass. The authors used the DADI technique to quantify three tautomeric mixtures of gossypol hexamethylether (HMEG). Scanning of the molecular ions (M = 602), we found that the molecular ions m / z 587 (M-CH 3), 571 (M-CH 3 O), 556 (M-CH 3 3- H 3 O) and 540 (M- 2CH (?) O) peak, the dialdehyde type (Ⅰ), bishydroxy endo ether type (Ⅱ) and monoaldehyde - mono orthohydroxy endol type (Ⅲ) HMEG pure product, according to their different structures, respectively, to give Different