Abstract: Medicinal agents are claimed exhibiting sustained release of active compound, containing a solid active ingredient, poorly soluble in water, and auxiliary agents, characterized in that the active compound, in a microcrystalline form or in form of a molecular dispersion, is distributed in or on pellets, and that the pellets are covered by a membrane having retarded permeability with respect to the active compound.

Abstract: The invention relates to a process for the determination of small substance quantities of medicines, of endogenous or other chemical compounds in biological material, characterized by either binding the compound to be determined and its deuterated analog to an antibody present in excess, which antibody is coupled to a stationary phase of a polymeric material, and separating the two compounds from the antibody and measuring by mass spectrometry the proportion of deuterated compound/not deuterated compound or, respectively, cross-reacting compound; or, in case a suitable deuterated or cross-reacting compound is not available, utilizing as the internal standard also a chemically similar compound which, however, is added after the antibody-mediated extraction, and inserting a separating process before mass spectrometry.