Abstract: The present invention is directed to salt-free and essentially salt-free p-boronophenylalanine-carbohydrate or p-boronophenylalanine-polyol complexes, as well as methods for making such compounds. In addition, the present invention provides methods for substantially solubilizing freeze-dried p-boronophenylalanine-carbohydrate and p-boronophenylalanine-polyol complexes. The present invention further provides compositions and methods for enhancing the solubility of boronophenylalanine.

Abstract: Soft, non-blocking, thermoplastic polyurethanes are prepared by reacting a long chain polyester or polyether diol, a short chain diol, a diisocyanate and a silicone diol of the formula: ##STR1## wherein x has a value of about 1 to 30, y has a value of about 1 to 200, R is an alkylene group having 2 to 4 carbon atoms, R.sup.1 is selected from the group consisting of an alkyl group having 1 to 18 carbon atoms, a haloalkyl group having 1 to 18 carbon atoms, a phenyl group, a substituted phenyl group, or a phenylalkyl group, and V and W are divalent linking groups. A unique feature of the invention is that the polymers exhibit, less blocking, are less susceptible to hydrolysis and are highly transparent. These polyurethanes are particularly useful in fabricating medical tubing.