Biocompatible phase invertable proteinaceous compositions and methods formaking and using the same are provided. The subject phase invertablecompositions are prepared by combining a proteinaceous substrate and a cross-linker. The proteinaceous substrate includes one or more proteins and anadhesion modifier, and may also include one or more of: a pasticizer, acarbohydrate, or other modification agent. In certain embodiments, the cross-linker is a heat-treated dialdehyde, e.g., heat-treated glutaraldehyde. Alsoprovided are kits for use in preparing the subject compositions. The subjectcompositions, kits and systems find use in a variety of different applications.
