In contrast,more » when (/sup 14/C) aminopyrine was intravenously infused, its clearance was significantly impaired in aspirin-damaged mucosa when compared with control studies, as evidenced by the increased ''trapping'' of this substance in injured epithelium. In addition, the degree of ''trapping'' of this substance from back-diffusion was not different in damaged mucosa from that observed in nondamaged epithelium. 1.1) perfusate solution, was not significantly different from nondamaged control mucosa. In mucosa damaged by either 20 mM or 40 mM aspirin, the recovery of (/sup 14/C) aminopyrine, when topically mixed with acid (pH. Using an in vivo canine chambered stomach preparation, the clearance of (/sup 14/C) aminopyrine across mucosa when intravenously infused and the back-diffusion of this substance from gastric lumen to mucosa when topically applied to gastric epithelium were evaluated in aspirin-damaged gastric epithelium. Impairment of aminopyrine clearance in aspirin-damaged canine gastric mucosaĭOE Office of Scientific and Technical Information (OSTI.GOV) The corresponding average recovery and relative standard deviation of the six components were as follows: 101.6, 1.46% for caffeine 99.7, 0.10% for phenacetin 100.9, 1.31% for phenobarbitone 100.2, 0.81% for theophylline 99.9, 0.81% for theobromine and 100.8, 0.48% for aminopyrine. The two mixtures were determined by computer-aided convolution curve method separately. On a partition chromatographic column in which the support is Kieselguhr and the stationary phase is sulfuric acid solution (2 mol/L), three components of compound theophylline tablet were simultaneously eluted by chloroform and three other components were simultaneously eluted by ammonia-saturated chloroform. ![]() [Determination of six main components in compound theophylline tablet by convolution curve method after prior separation by column partition chromatography
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