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GC-FID chromatograms of the fraction of triterpenoid acids (after methylation) obtained from chloroform extracts of cuticular waxes of bilberry fruit harvested in three developmental stages (young berries in May, unripen full-size berries in mid-June, and ripen berries in early July). Methyl esters of: 1—3-oxo-oleanolic acid, 2—oleanolic acid, 3—3-oxo-ursolic acid, 4—ursolic acid, 5—maslinic acid, 6—corosolic acid, 7—oleanolic acid acetate.
