A method of adjusting the composition of a chromatography product to achieve a target proportion of a desired component, comprising: contacting an input zone of a simulated moving bed ("SMB") chromatography apparatus comprising a cation resin with an input feed comprising input feed proportions of the desired component and a second component and having an input feed dissolved solids content; contacting an elution zone of the SMB apparatus with an eluent feed comprising eluent feed proportions of the desired component and the second component and having an eluent feed dissolved solids content, wherein the eluent comprises the desired component in the same ratio as the mixture that is used as an input stream for the SMB chromatography system; and operating the SMB apparatus to blend the desired component from the input feed, delivered through an enrichment zone of the SMB apparatus, with the desired component from the eluent feed, delivered though the elution zone, to form an extract product comprising the target proportion of the desired component and an extract dissolved solids content, wherein the target proportion of the desired component is greater than the input feed proportion of the desired component, and wherein the extract dissolved solids content is at least 50%, preferably at least 60%, most preferably at least 80% of the input feed dissolved solids content; and collecting the extract product having the target proportion of the desired component from the SMB apparatus; wherein the desired component is fructose and the second component is glucose. contacting an input zone of a simulated moving bed ("SMB") chromatography apparatus comprising a cation resin with an input feed comprising input feed proportions of the desired component and a second component and having an input feed dissolved solids content; contacting an elution zone of the SMB apparatus with an eluent feed comprising eluent feed proportions of the desired component and the second component and having an eluent feed dissolved solids content, wherein the eluent comprises the desired component in the same ratio as the mixture that is used as an input stream for the SMB chromatography system; and operating the SMB apparatus to blend the desired component from the input feed, delivered through an enrichment zone of the SMB apparatus, with the desired component from the eluent feed, delivered though the elution zone, to form an extract product comprising the target proportion of the desired component and an extract dissolved solids content, wherein the target proportion of the desired component is greater than the input feed proportion of the desired component, and wherein the extract dissolved solids content is at least 50%, preferably at least 60%, most preferably at least 80% of the input feed dissolved solids content; and wherein the target proportion of the desired component is greater than the input feed proportion of the desired component, and wherein the extract dissolved solids content is at least 50%, preferably at least 60%, most preferably at least 80% of the input feed dissolved solids content; and collecting the extract product having the target proportion of the desired component from the SMB apparatus; wherein the desired component is fructose and the second component is glucose.