数種のフェルラ酸エステルの質量スペクトル

抄録

The mass spectra of cholesteryl ferulate, campesteryl ferulate, β-sitosteryl ferulate and stigmasteryl ferulate, and of their acetyl derivatives and trimethylsilyl ether derivatives, and of a mixture of campesteryl farulate, β-sitosteryl ferulate and stigmasteryl ferulate, and of oryzanol that is a mixture of some ferulates from rice bran oil were measured. In these spectra, the molecular ion peaks of steryl ferulates and their acetyl derivatives were not observed. The base peaks were observed at m/e 368 in the spectra of free cholesteryl ferulate and its acetate, at m/e 382 in the spectra of free campesteryl ferulate and its acetate, at m/e 394 in the spectra of free stigmasteryl ferulate and its acetate, and at m/e 396 in the spectra of free β-sitosteryl ferulate and its acetate. These base peaks are corresponding to M-194 in spectra of ferulates and M- (194+42) in spectra of acetyl derivatives of ferulates. These peaks serve to distinguish a steryl ferulate from other steryl ferulates. Moreover, the characteristic ion of these steryl ferulates due to the formation of ferulic acid ion occured at m/e 194. The fragmentation patterns of the mass spectra of acetyl derivatives of steryl ferulates were similar to those of corresponding steryl ferulates, and the characteristic ions of these acetyl derivatives of the steryl ferulates were not found. In the mass spectra of trimethylsilyl ether derivatives of the steryl ferulates, the molecular ion peaks were observed for each derivative, but they were very small. Furthermore, the mass spectra of the mixture of campesteryl ferulate, β-sitosteryl ferulate and stigmasteryl ferulate, and of the oryzanol were investigated. It was found that the mass spectrum of oryzanol can be used for the qualitative analysis of the components in the mixture of ferulates from rice bran oil.