Bipyridine)tetraacid, a new aza-aromatic tetraacid, was synthesizedstarting from diquinoline, and its structure was confirmed by means of mass spectrum and infrared spectrum.
Toluene pretreatment caused many activated toluene species existing on the surface of zeolite HZSM-5, by which the activity of sample was increased. Moreover, variation in the surface Si+/Al+ ratio of HZSM-5 was sensi...
Native glycopeptides are suitable to FAB mass spectrometric analysis due to their high polarity, low volatility and large molecular size. The deficiency in the FAB spectra of glycopeptides is the limited number o...