Please read the following reference: It is free open access journal. It actually does not matter, what is the substance. You have to prepare the sample.
ISOLATION AND CHARACTERIZATION OF PHYTOSTEROLS FROM CORDIA MACLEODII (HOOK F. AND THOMSON) BARK BY CHROMATOGRAPHIC AND SPECTROSCOPIC METHOD. (2014). NARIYA PB, SHUKLA VJ, ACHARYA RN, NARIYA MB, BHATT PV, PANDIT CM, Tada R, Asian J. Pharma. Clinical Res. 7(5): 86-88.