The invention is directed to a complex, including: a porous composite carrier including: a porous organic foam material containing open pores, each pore comprising a wall defining the pore; and a crosslinked product having aldehyde groups and immobilized on the surface of the walls of one or more pores of the porous organic foam materials, and a protein, polypeptide, or oligopeptide immobilized onto the porous composite carrier through a reaction between an amino group of the protein, polypeptide or oligopeptide and an aldehyde group of the composite carrier. The immobilized product has high specific surface area and high specific activity. The immobilization is simple and in low cost, and is suitable for industrial application.

The present invention relates to a biobased barrier film for a paper or paperboard-based packaging material, said barrier film comprising: a substrate layer and a coating layer disposed on at least one surface of the substrate layer, wherein said substrate layer has a grammage in the range of 1-60 g/m.sup.2 and comprises at least 50 wt % of highly refined cellulose pulp based on the dry weight of the substrate layer, and wherein said coating layer has a grammage in the range of 1-15 g/m.sup.2 and comprises at least 50 wt % of a film forming modified starch and 0.1-10 wt % of a biobased lubricant, based on the dry weight of the coating layer.