Analysis of Volatile Compounds in the Root Peel, Stem Peel, and Fruit Peel of Pomegranate (Punica granatum) by TDGC/MS

Volatile components in the root peels, stem peels, and fruit peels of pomegranate (Punica granatum) were analyzed by thermal desorption gas chromatography/mass spectrometry (TD GC/MS).Twenty-four compounds including 17 hydrocarbons, 1 aldehyde, 1 ketone, 2 heterocyclics, and 3 others were identified in the root peels.Thirty compounds including 5 hydrocarbons, 8 alcohols, 3 aldehydes, 2 ketones, 11 esters, and 1 other were identified in the stem peels.Sixty-two compounds including 10 hydrocarbons, 18 alcohols, 6 aldehydes, 4 ketones, 1 carboxylic acid, 17 esters, 1 heterocyclic, and 5 others were identified in the fruit peels.Monoterpene hydrocarbons such as α-pinene (13.49%), 2-β-pinene (16.31%), δ-3carene (22.94%), and dl-limonene (17.33%) were found to be the major volatile compounds in the root peels.The main volatile compound in the stem peels and fruit peels was ethanol of alcohol, which represented 40.76% and 42.12% of the total concentration of volatiles, respectively.Other compounds dominating the stem peels and fruit peels were all acetic acids and ethyl ester of ester, which represented 21.29% and 19.59% of the total concentration of volatiles, respectively.