Extraction, Separation and Identification of Chemical Ingredients of Elephantopus Scaber L. Using Factorial Design of Experiment

摘要

Soxhlet extraction technique is employed for the extraction and separation of chemical constituents in the medicinal plant, Elephantopus scaber L. The effect of parameters, such as different parts of the plant (leaves, roots and stems), extraction time and types of solvent (n-hexane and methanol) on the extracted yield and the percentage of extraction were investigated. The design of experiment was done using factorial design. The data were analyzed using ANOVA as well as factorial design. The experimental results show that the methanol is better than n-hexane but an extraction time of 9 hours was required for stems and roots while 12 hours for leaves. Essential crude of Elephantopus scaber L. obtained by Soxhlet extraction was further analyzed by gas chromatography-mass spectrometry detection to identify the chemical ingredients of the plant and used as a standard in the qualitative analysis for certain chemical compounds based on the retention time on the chromatogram. Six compounds such as stigmasterol, lupeol, stearic acid, deoxyelephantopin isomers, analogue 1 and analogue 2 of deoxyelephantopin have been identified. Oven temperature program of gas chromatography has been developed in this research. The results obtained, enable one to make qualitative and quantitative analysis for the essential oil which was extracted from the herbal plant. Maximum extraction conditions of the stigmasterol and lupeol were determined by comparing the area percentage below the peak in chromatogram with the GCMS standard. Stigmasterol: 6 hours extraction time using n-hexane and stems show the highest area percentage (8.145%). Lupeol: 9 hours extraction time using n-hexane and stems show the highest area percentage (68.580%).