Disclosed and claimed are: a composition including at least one
glycosaminoglycan, e.g., CIS, at least one perfluorinated substance and at least one alginate, e.g.,
sodium alginate, wherein:the at least one
glycosaminoglycan and / or the perfluorinated substance and / or the alginate are cross-linked or polymerized, e.g., the alginate is cross-linked or polymerized, for instance by addition of an inorganic salt, such as a
calcium salt; orthe at least one
glycosaminoglycan, the perfluorinated substance and the alginate are covalently bound, e.g., by means of a
coupling reaction involving a
linker molecule such as DVS; orthe at least one glycosaminoglycan and / or the perfluorinated substance and / or the alginate are cross-linked or polymerized, e.g., the alginate is cross-linked or polymerized, for instance by addition of an inorganic salt, such as a
calcium salt, and the at least one glycosaminoglycan and the alginate are covalently bound, e.g., by means of a
coupling reaction involving a
linker molecule such as DVS, and the
covalent binding can have been performed prior to cross-linking or polymerizing or vice versa; and,gels comprising the composition; mixtures of such gels or of at least one such gel and at least one such composition; and,methods for making and using such compositions and gels, including products therefrom such as "paints", sprays, matrices, beads, microcapsules.