QUALITY CONTROL, CHEMICAL COMPOSITION AND ANTIOXIDANT ACTIVITY OF SOME MARKETED PEPPERMINT OIL SAMPLESAbstract
This work aimed to evaluate the quality of some commercial peppermint oil products available in the Egyptian market. Also, analysis of peppermint oil extracted from Mentha piperita L. leaves marketed in Egypt. Thus, quality control of both herb extracted and purchased oil products. Essential oils were analyzed using GC/MS, and the main ingredients of each peppermint oil sample were quantified. The antioxidant potential for each of the tested six oil samples was performed using the DPPH radical scavenging assay using ascorbic acid as a reference standard. Also, their EC50% values were calculated. The quality of the samples had been evaluated according to the European Pharmacopeia limits for each of the major peppermint oil components. Thus, menthol, menthone, menthyl acetate, carvone, and pulegone percent composition in each sample was used to evaluate its quality. All the tested samples were found to possess strong to moderate antioxidant activities with EC50% values ranged from 20.44 and 66.10 depending on the oil chemical composition variation. Percent composition of the major peppermint oil components varied within the tested samples.
A. M. Beltagy * and D. M. Beltagy
Department of Pharmacognosy, Faculty of Pharmacy, Damanhour University, Damanhour, Egypt.
22 November 2018
20 February 2019
28 February 2019
01 August 2019