The molecular weights of fructans range from 504 to millions. Some of large
polymers hardly dissolve in hot water, but oligomers are freely soluble in water or ethanol.
Some HPLC methods now separate the whole range of isomers present in an extract up to DP
6, and different isomers are distinguishable up to DP 10. Two kinds of columns for HPLC
that increasingly used are reverse phase and anion exchange at high pH