Polymer combinatorial libraries

Polymer libraries have recently been the focus of several publications with the aim either to discover novel polymeric materials for a specific application (primary libraries) or to rapidly optimize the properties of known polymers (focused libraries). All the major areas where successful combinatorial approaches to polymer libraries have been reported are covered in the following sections with the help of a specific, recent example and up-to-date referencing. Several other papers dealing with polymer combinatorial libraries can be consulted by the interested reader (80-89). 

To overcome the problem of their limited range of applicability and to extend the spectrum of application other than to the imprint molecule, molecularly imprinted polymer combinatorial libraries for multiple simultaneous chiral separations have been prepared [ 191 ], demonstrating that the ligand cross-reactivities of molecularly imprinted polymers can be beneficially employed for the simultaneous separation of different stereoisomeric structures. 

In another attempt, cyclopeptide SOs and SO libraries, respectively, for CE enan-tioseparations have been developed by combinatorial chemistry approaches [378,379], and recently also molecularly imprinted polymer combinatorial libraries have been prepared [ 191 ]. 

Combinatorial Chemistry. Figure 2 Chemical libraries are prepared either by parallel synthesis or by the split-and-recombine method. In the latter case, coupling m building blocks in m separated reaction flasks through n synthetic cycles on a beaded polymer carrier generates a combinatorial library with nf individual compounds and one compound per bead. 

Kobayashi, S. Combinatorial Library Synthesis Using Polymer-supported Catalysts. In Combinatorial Chemistry, Fenniri, H., Ed., Oxford University Press Oxford, U.K., 2000 pp 421-432. 

The last work pertaining to the discovery of new catalysts is perhaps the most novel approach to be reported thus far. In one of the earliest approaches taken toward catalyst development, Menger et al. (61) attempted to find catalysts for phosphate ester hydrolysis. A series of eight functionalized carboxylic acids were attached to polyallylamine in various combinations. Each of these polymers were then treated with one of three metals, Mg2+, Zn2+, or Fe3+. The different members of each library were identified by the relative percentages of each carboxylic acid attached to the polyamine. For example, one polymer possessed 15% Oct, 15% Imi, 15% Phe, and 5% Fe3+. There is no attempt to identify the location of the various carboxylic acids in a given polymer. This approach is novel since each system consists of an ensemble of different ligands with the carboxylic acids positioned in various locations. Each polymer within a given ratio of carboxylic acids consists of a combinatorial library of potential catalysts. 

Combinatorial chemistry, 7 380-434 8 400—401 13 283-284. See also High-throughput experimentation applications, 7 381-383 commercial environment, 7 387-389 methodology, 7 383-387 microwaves in, 16 548-552 nomenclature, 7 380 polymers, 7 405—413 Combinatorial libraries, 12 515-517 Combinatorial methods, 7 380 Combinatorial optimization approach, in computer-aided molecular design, 26 1037... 

Mass spectrometry is an indispensable analytical tool in chemistry, biochemistry, pharmacy, and medicine. No student, researcher or practitioner in these disciplines can really get along without a substantial knowledge of mass spectrometry. Mass spectrometry is employed to analyze combinatorial libraries [1,2] sequence biomolecules, [3] and help explore single cells [4,5] or other planets. [6] Structure elucidation of unknowns, environmental and forensic analytics, quality control of drugs, flavors and polymers they all rely to a great extent on mass spectrometry. [7-11]... 

Figure 8.1 A dynamic combinatorial library on the preparation of polymer materials bearing reversible linkages.

The simplicity of these transformations and high yields in both steps indicate that the preparation of compounds of type 106 from 1, 2 can easily be automated and performed as liquid phase parallel synthesis. The starting materials 1,2 can also be put on a polymer support to obtain combinatorial libraries of l,l -di-, l,r,2 -tri-, l,l, 2, 2 -tetra-, l,r,2, 3 -tetra-, l,r,2, 2, 3 -penta- and... 

Reynolds CH (1999) Designing diverse and focused combinatorial libraries of synthetic polymers. J Comb Chem 1 297-306... 

Simon CG Jr, Stephens JS, Dorsey SM, Becker ML (2007) Fabrication of combinatorial polymer scaffold libraries. Rev Sci Instrum 78 0722071... 

Kholodovych V, Gubskaya A, Bohrer M et al. (2008) Prediction of biological response for large combinatorial libraris of biodegradable polymers polymethacrylates as a test case. Polymer 49 2435-2439... 

Parlow, J. J. Normansell, J. E. Discovery of a Herbicidal Lead Using Polymer-Bound Activated Esters in Generating a Combinatorial Library of Amides and Esters, Molecular Diversity, 1996, /, 217. 

Combinatorial chemistry has moved from specially centralized laboratories, often equipped with multimillion-dollar robots, onto the bench of individual medicinal chemists. This change in direction requires the availability of personal chemistry tools that are simple to operate, easy to arrange in the laboratory, and reasonably priced. Such instruments are now available for the effective synthesis of combinatorial libraries. The Encore synthesizer represents a simple and efficient personal chemistry tool that allows the execution of directed split-and-pool combinatorial synthesis. The current version of the Encore synthesizer is designed for solid-phase synthesis on SynPhase Lanterns however, it can be modified for synthesis on alternative solid supports such as resin plugs from Polymer Laboratories (e.g., StratoSpheres Plugs). 

---