TY - JOUR
T1 - Mass spectrometry research of cholesteric liquid crystals
T2 - I. comparison of EI, FD and CI mass spectra
AU - Zhang, Kangling
AU - Wu, Wannian
AU - Li, Guozhen
PY - 1991/12
Y1 - 1991/12
N2 - Mass spectra (MS) of cholesterol esters and halides were obtained by means of Electron Impact (EI), Field Desorption (FD) and Chemical Ionization (CI). The result shows that EI fragmentation process of cholesterol esters is determined mostly by the steroid nucleus, and there is almost no difference among the mass spectra of various compounds. FDMS can supply both clear information of molecular weights of compounds and a fragment ion at m/e 369 due to the steriod nucleus. Besides having the same feafures as that of FD-MS, CIMS of most compounds yield information of RCOOH structure. Therefore, mass spectra gained by these three ionization modes are satisfactorily used to analyse liquid crystals.
AB - Mass spectra (MS) of cholesterol esters and halides were obtained by means of Electron Impact (EI), Field Desorption (FD) and Chemical Ionization (CI). The result shows that EI fragmentation process of cholesterol esters is determined mostly by the steroid nucleus, and there is almost no difference among the mass spectra of various compounds. FDMS can supply both clear information of molecular weights of compounds and a fragment ion at m/e 369 due to the steriod nucleus. Besides having the same feafures as that of FD-MS, CIMS of most compounds yield information of RCOOH structure. Therefore, mass spectra gained by these three ionization modes are satisfactorily used to analyse liquid crystals.
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M3 - Article
AN - SCOPUS:0026382468
SN - 0253-9683
VL - 17
SP - 783
EP - 789
JO - Huadong Huagong Xueyuan xuebao
JF - Huadong Huagong Xueyuan xuebao
IS - 6
ER -