DESFERRIOXAMINE ORAL DELIVERY SYSTEM

摘要

Modified amino acids and methods for their preparation and use as oral delivery systems for pharmaceutical agents are described.The modified amino acids are preparable by reacting single amino acids or mixtures of two or more kinds of amino acids with anamino modifying agent such as benzene sulfonyl chloride, benzoyl chloride, and hippuryl chloride. The modified amino acids may formencapsulating microspheres in the presence of the active agent under sphere-forming conditions. Alternatively, the modified amino acidsmay be used as a carrier by simply mixing the amino acids with the active agent. The preferred acylated amino acid carrier is salicyloyl-phenylalanine. The modified amino acids are particularly useful in delivering biologically active agents, e.g., desferrioxamine, insulin orcromolyn sodium, or other agents which are sensitive to the denaturing conditions of the gastrointestinal tract.