While, they have a form of flexible and
durable covering materials permeable to water
vapour and metabolites, they protect the wound
again bacterial infection. It is well known that
hydrogels based on biopolymers, including sodium
alginate (SA) and gelatine (G), form physical
crosslinked three-dimensional network presenting
unrestrained structure without sufficient mechanical
strength after absorption of the wound exudates [1].
Moreover, they dissolve in the wound secretion at
body temperature and thus cannot be completely
removed from the wound [2]