1. An aqueous composition comprising protein and water, where the composition has a conductivity of less than about 2.5 mS / cm and the protein has a molecular weight (M) of more than about 47 kDa. The composition of claim 1, wherein the protein has an M of greater than about 57 kDa. The composition of claim 1, wherein the protein has an M of greater than about 100 kDa. The composition of claim 1, wherein the protein has an M of greater than about 150 kDa. The composition of claim 1, wherein the protein has an M of greater than about 200 kDa. The composition of claim 1, wherein the protein has an M of greater than about 250 kDa. The composition of claim 1, wherein the composition has a conductivity of less than about 2 mS / cm. The composition of claim 1, wherein the composition has a conductivity of less than about 1.5 mS / cm. The composition of claim 1, wherein the composition has a conductivity of less than about 1 mS / cm. The composition of claim 1, wherein the composition has a conductivity of less than about 0.5 mS / cm. An aqueous composition comprising a protein in a concentration of at least about 10 μg / ml and water, where the composition has a conductivity of less than about 2 mS / cm. 12. The composition of claim 11, wherein the protein concentration is at least about 1 mg / ml. The composition of claim 11, wherein the protein concentration is at least about 10 mg / ml. The composition of claim 11, wherein the protein concentration is at least about 50 mg / ml. The composition of claim 11, wherein the protein concentration is at least about 100 mg / ml. The composition of claim 11, wherein the protein concentration is at least about 150 mg / ml. 17. The composition of claim 11, in which the protein concentration is at least about 200 mg / ml. The composition of claim 11, wherein the protein concentration is greater than about 200 mg / ml. The composition of claim 11, wherein the composition has a conductivity of less than about 1 mS / s1. Водная компо
