Therapeutic and diagnostic use of modified polymeric microcapsules
申请人:Board of Regents, The University of Texas System
公开号:US05484584A1
公开(公告)日:1996-01-16
The present invention relates to a highly efficient method of preparing modified microcapsules exhibiting selective targeting. These microcapsules are suitable for encapsulation surface attachment of therapeutic and diagnostic agents. In one aspect of the invention, surface charge of the polymeric material is altered by conjugation of an amino acid ester to the providing improved targeting of encapsulated agents to specific tissue cells. Examples include encapsulation of radiodiagnostic agents in 1 .mu.m capsules to provide improved opacification and encapsulation of cytotoxic agents in 100 .mu.m capsules for chemoembolization procedures. The microcapsules are suitable for attachment of a wide range of targeting agents, including antibodies, steroids and drugs, which may be attached to the microcapsule polymer before or after formation of suitably sized microcapsules. The invention also includes microcapsules surface modified with hydroxyl groups. Various agents such as estrone may be attached to the microcapsules and effectively targeted to selected organs.
Chemoenzymatic synthesis of the enantiomers of iopanoic acid
作者:M. Colombo、M. De Amici、C. De Micheli、D. Pitré、G. Carrea、S. Riva
DOI:10.1016/s0957-4166(00)86152-2
日期:1991.1
The two enantiomers of Iopanoic acid 1 were prepared in enantiomeric excess higher than 90% by enzyme-catalyzed hydrolysis of precursors (+/-)-2a and (+/-)-3a, followed by standard chemical transformations. Among the tested enzymes, chymotrypsin and Lipase PS proved to be the most selective catalysts. The stereochemical outcome of the lipase-catalyzed hydrolyses of esters (+/-)-2a-d is strictly dependent upon both the size of the alkyl group attached to the chiral center and the substituent in the aromatic ring. The enantioselectivity of the reactions was evaluated by chiral HPLC and the configurations of the new products were assigned by chemical correlations.
Diagnostic and Therapeutic Potential of Poly(benzyl L-glutamate)
作者:David J. Yang、Chun Li、Sarah Nikiforow、Matthew B. Gretzer、Li-Ren Kuang、Mona S. Lopez、Sidney Wallace、Karen Vargas
DOI:10.1002/jps.2600830312
日期:1994.3
Poly(benzylL-glutamate) (PBLG) microcapsules, prepared by a solvent evaporation technique for intravenous injection, are evaluated for their potential use in diagnostic computed tomographic enhancement of liver images. The smaller microcapsules, < 3 microns, loaded with a radiopaque contrast material, ethyl iopanoate (IOPAE), produced prolonged opacification of the liver when delivered intravenously