Fig. 13

GC–MS chromatogram of sample 1 in which castor wax was identified by its markers: a mass spectrum and chemical structure of 12-methoxy stearic acid ME; b mass spectrum and chemical structure of 12-hydroxy stearic acid ME

GC–MS chromatogram of sample 1 in which castor wax was identified by its markers: a mass spectrum and chemical structure of 12-methoxy stearic acid ME; b mass spectrum and chemical structure of 12-hydroxy stearic acid ME