Author: "H. Rupprecht" / Journal: die pharmazie - Searchworks@Jio Institute Digital Library Search Results

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Start Over Author "H. Rupprecht" Journal die pharmazie

Author: H, Rupprecht and H, Liebl
Subjects: Anions, Structure-Activity Relationship, Surface-Active Agents, Surface Properties, Silicic Acid, Water, Adsorption, Colloids, Cations, Monovalent, Silicon Dioxide, Polyethylene Glycols
Published: 1975

Author: H, Liebi, A, Haggag, and H, Rupprecht
Subjects: Solutions, Surface-Active Agents, Suspensions, Surface Properties, Suppositories, Silicic Acid, Pharmaceutic Aids, Biological Availability, Humans, Drug Interactions, Indicators and Reagents, Silicon Dioxide
Published: 1977

Author: H, Rupprecht, G, Kindl, and M J, Biersack
Subjects: Solutions, Time Factors, Digitoxin, Estradiol, Hydrocortisone, Surface Properties, Steroids, Silicon Dioxide
Published: 1974

Author: H, Rupprecht and G, Kindl
Subjects: Chloramphenicol, Pharmaceutical Preparations, Codeine, Surface Properties, Amitriptyline, Delayed-Action Preparations, Phenethylamines, Adsorption, Silicon Dioxide, Benzoates, Salicylates
Published: 1974

Author: H, Rupprecht and K H, Ziller
Subjects: Time Factors, Solubility, Suspensions, Chemistry, Pharmaceutical, Crystallization
Published: 1981

Author: H, Tischinger-Wagner, W, Endres, H, Rupprecht, and A, Weingart
Subjects: Excipients, Linoleic Acid, Linoleic Acids, Spectrophotometry, Infrared, Ultraviolet Rays, Silicic Acid, Aluminum Oxide, Silicon Dioxide, Oxidation-Reduction, Aluminum
Abstract: Linoleic acid methyl ester (LME) was selected as a model to study the autoxidation of unsaturated compounds at the surfaces of inorganic excipients. From IR spectra of LME-silica adsorbates it was concluded that the interaction between LME and the silica surface is mainly due to hydrogen bonds, established between the ester carbonyl and the silica silanol groups. The autoxidation was continuously monitored by measuring the oxygen consumption of LME under UV light exposure and isobaric conditions, and, in parallel, by determining the carbonyl and peroxide values of LME. The oxidative degradation of LME is enhanced by porous and colloidal silicas as well as by colloidal aluminium oxide. From the oxygen consumption and the ratio of intermediates (carbonyls, peroxides) formed during the degradation of LME it was concluded that the prooxidative effect of the inorganic excipients can be attributed to an accelerated reaction of the peroxides of LME.
Published: 1987

Author: H, Rupprecht, H, Liebl, and E, Ullmann
Subjects: Suspensions, Surface Properties, Colloids, Silicon Dioxide, Absorption, Ethers, Polyethylene Glycols
Published: 1973

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