Glucan fiber compositions for use in laundry care and fabric care

A composition comprising (I) an alpha-glucan or (II) an alpha-glucan ether, wherein the glycosidic linkages of the alpha-glucan or the alpha-glucan ether comprise:

• (i) at least 75% alpha-1,3 glycosidic linkages,
• (ii) less than 25% alpha-1,6 glycosidic linkages, and
• (iii) less than 10% alpha-1,3,6 glycosidic linkages,
• wherein the percent glycosidic linkages of the alpha-glucan are determined by methylation analysis;
• wherein the alpha-glucan ether has a degree of substitution (DoS) with at least one organic group that is no higher than 3.0;
• wherein the alpha-glucan ether comprises at least one substructure —CG—O—C—, wherein “—CG—” of said substructure represents carbon atom 2, 4, or 6 of a glucose monomeric unit of the alpha-glucan ether, and “—C—” of said substructure represents a carbon atom of said organic group that is in said ether linkage;
• and wherein the composition is in the form of a unit dose.