The present invention relates to an aqueous barrier coating composition comprising: 20-80% by weight of a dissolved first polysaccharide having a first degree of polymerization (DP1) of at least 150, based on the total solids content of the aqueous barrier coating composition; and 20-80% by weight of a dissolved second polysaccharide having a second degree of polymerization (DP2) of 100 or less, based on the total solids content of the aqueous barrier coating composition; wherein the ratio of DP1:DP2 is at least 10:1; and wherein the aqueous barrier coating composition has a total solids content in the range of 10-90% by weight.

An object is to provide a hollow spherical particle that has higher safety and can be prepared more easily. This object can be achieved by a hollow spherical particle that is a self-assembled body of a lignin-saccharide complex, the lignin-saccharide complex having at least one bond selected from the group consisting of an -ether bond between lignin and polysaccharide, an -ester bond between lignin and polysaccharide, and a -ester bond between lignin and polysaccharide.