- 作者: 劉高家秀; 謝清白
- 作者服務機構: Department of Chemistry, National Taiwan Normal University, Taipei, Taiwan 117, R.O.C.
- 中文摘要: In-beam and matrix-isolation techniques have been used in the mass spectral studies of several categories of biologically significant compounds. These include amino acids, quaternary ammonium salts, vitamins and nucleosides. Molecular ions and/ or (M+H)/sup +/ ions are obtained, together with useful fragmentations, all of which are valuable in structural elucidations. Spectra obtained by this version of the in-beam technique are similar but not identical with those obtained by field desorption and secondary ion mass spectrometry. Ammonium and sodium chlorides, ammonium sulfate, p-toluenesulfonic and hydrochloric acids can all be used as a room temperature matrix. The detection limits for vitamin E and 2'deoxyguanosine have been determined as 1 ng and 5 mg, respectively.
- 英文摘要: --
- 中文關鍵字: Biomolecules; in-beam EI.
- 英文關鍵字: Biomolecules; in-beam EI.