SEARCH Articles Figures Tables Chemical class fractionation Compound class fractionation Compound class fractionation method Compound class fractions Fractionation first class Fractionation into Main Lipid Classes Fractionation of Pure Compound Classes Fractionation second class Fractionation third class Lipid classes, fractionation Minimum Reflux Mode Fractionation Classes Polycyclic aromatic hydrocarbons class fractionation