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. 2018 Oct 27;23(11):2790. doi: 10.3390/molecules23112790

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Representative GC-FID chromatograms of the fraction containing methyl esters of triterpene acids (A) and the fraction containing sterols and neutral triterpenes (B) obtained from apple pomace. Peaks are numbered according to the retention times: (1) oleanolic acid (methyl ester), (2) ursolic acid (methyl ester), (3) pomolic acid (methyl ester), (4) cholesterol, (5) cholesta-3,5-dien-7-one, (6) campesterol, (7) cholest-4-ene-3,6-dione, (8) stigmasterol, (9) sitosterol, (10) isofucosterol, (11) cycloartanol, (12) β-amyrin, (13) α-amyrin, (14) stigmasta-3,5-dien-7-one, (15) sitostenone, (16) ursolic aldehyde, (17) erythrodiol, (18) uvaol. Peaks not numbered are associated with aliphatic or phenolic compounds.