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A simple GC–MS method for the screening of betulinic, corosolic, maslinic, oleanolic and ursolic acid contents in commercial botanicals used as food supplement ingredients

Food ChemistryFood Bioactive CompoundBiochemistrySimple Gc–ms MethodMedicineBioanalysisPhytochemicalPhytochemistryPharmacologyUrsolic Acid ContentsChromatographyFood Supplement Ingredients