Patent ID: 7540184

Claim:
An analyzing method for coloring material composition, comprising a chromatography step of loading a subject sample containing the coloring material composition to a chromatography apparatus that holds a separating base material containing a cellulosic material and a metallic oxide material, so as to separate analytes in the coloring material composition using a mobile phase of a liquid, wherein the mobile phase has a solubility parameter represented by the following formula (1) that is within the range of 9.5 to 16: Solubility ⁢ ⁢ Parameter ⁢ ⁢ of ⁢ ⁢ Mobile ⁢ ⁢ Phase ⁢ ⁢ ( d ) = ∑ i = 1 ⁢ ⁢ ton ⁢ ( di × Ri ) , Formula ⁢ ⁢ ( 1 ) wherein i is one or more integers; di is the solubility parameter of the i-th solvent of n kinds of solvents constituting the mobile phase; Ri is the mixing ratio in the mobile phase of the i-th solvent of n kinds of solvents constituting the mobile phase; and the total from R 1 to R n is 1.