Abstract: A polymer containing an N-linked sialo-glycan wherein a sialo-glycan is condensed to a ?-polyglutamic acid using a chemical compound having an amino group on one end and a carboxyl group on another end and represented by the structural formula (I). Formula (I) (In the formula, Z means a hydroxy group or a residue represented by the formula (II), and n represents an integer of 10 or more, with the proviso that any one or more of the Z's is represented by the formula in (II).) Formula (II) (In the formula, X means a hydroxy group or an acetylamino group, Y1 and Y2 mean a hydroxyl group or an N-acetylneuraminic acid residue, L means a hydrocarbon, an m represents 0 or an integer of 1 or 2, with the proviso that Y1 and Y2 are not the same.

Abstract: A polymer containing an N-linked sialo-glycan wherein a sialo-glycan is condensed to a ?-polyglutamic acid using a chemical compound having an amino group on one end and a carboxyl group on another end and represented by the structural formula (I). Formula (I) (In the formula, Z means a hydroxy group or a residue represented by the formula (II), and n represents an integer of 10 or more, with the proviso that any one or more of the Z's is represented by the formula in (II).) Formula (II) (In the formula, X means a hydroxy group or an acetylamino group, Y1 and Y2 mean a hydroxyl group or an N-acetylneuraminic acid residue, L means a hydrocarbon, an m represents 0 or an integer of 1 or 2, with the proviso that Y1 and Y2 are not the same.

Abstract: A method in which the recognition specificity of a virus for a receptor sugar chain can be easily determined with a simple instrument or apparatus is provided. In a method for determining the recognition specificity of a virus for a receptor sugar chain or for determining the change in a host infected in accordance with the mutation of virus comprising, a sample of the virus is brought into contact with a support having a polymer with sialo-oligosaccharide immobilized on the surface thereof; and the degree of binding therein is assayed to determine the recognition specificity of said virus for said receptor sugar chain and to determine the change in a host range. The method is suitable for the surveillance of virus.

Abstract: A method is provided in which the recognition specificity of a virus for a receptor sugar chain can be easily determined with a simple instrument or apparatus. This method for determining the recognition specificity of a virus for a receptor sugar chain or for determining the change in a host infected in accordance with the mutation of virus includes the steps of bringing a sample of the virus into contact with a support having a polymer with sialo-oligosaccharide immobilized on the surface thereof; and assaying the degree of binding therein to determine the recognition specificity of the virus for the receptor sugar chain and to determine the change in a host range. The method is suitable for the surveillance of a virus.

Abstract: A lactosyl glycoside or an N-acetyllactosaminyl glycoside useful as foods, functional food materials, medicines, and reagents is provided with high yield and inexpensively by using a transfer reaction represented by the following formula in the presence of an enzyme having an activity of cleaving a &bgr;1,4 glucosyl bond: LacA-X+Y→LacA-Y+X, wherein LacA represents lactose or N-acetyllactosaminide; X represents hydrogen (H), a saccharide, a glycoconjugate, or a phenolic compound; and Y represents a compound having an alcoholic hydroxyl group or a phenolic hydroxyl group.