Saponin Inventory from Argania spinosa Kernel Cakes by Liquid Chromatography and Mass Spectrometry

Abstract : IntroductionArgania spinosa kernel cakes, obtained from argan oil extraction process, are known to contain large amounts of saponins. Only a few have been characterised previously, due to the use of pure ethanol as extracting solvent. The use of aqueous 50% ethanol improved the extraction of more polar saponins. ObjectiveIdentification of polar saponins in kernel cakes of Argania spinosa by liquid chromatography-mass spectrometry and NMR techniques. MethodsDefatted kernel cakes were first extracted with ethanol and then twice with 50% aqueous ethanol. Individual crude extracts were analysed with an ion-trap mass spectrometer in negative mode electrospray MS and MS/MS modes. NMR experiments were run under standard conditions at 300K on a Bruker DRX-600 spectrometer. ResultsThe LC-MS base peak chromatogram of saponins from pure ethanol extract was dominated by 11 large and several small peaks but the UV chromatogram showed only two peaks, corresponding to the main neutral saponins found previously in Argania: arganine A and B. In 50% aqueous ethanol extracts, numerous other saponins were detected. Many of them were glucuronide oleanane-type triterpene carboxylic acid 3,28-O-bidesmosides (GOTCAB saponins). The assignments of H-1- and C-13-NMR spectra of the four most abundant GOTCAB saponins confirmed the MS results. ConclusionFour GOTCAB saponins were structurally identified by NMR analysis in the 50% aqueous ethanol extract. Furthermore, LC-MS analyses showed the presence of at least 19 additional polar saponins in these kernel cakes. Copyright (c) 2013 John Wiley & Sons, Ltd. Argania spinosa kernel cakes, byproducts of argan oil extraction process, are known to contain large amounts of saponins. Only a few of them were characterized previously. This was due to the choice of pure ethanol as extracting solvent. The aqueous 50% ethanol improved drastically the extraction of more polar saponins. Four GOTCAB saponins (Glucuronide oleanane-type triterpene carboxylic acid 3,28-bidesmosides) were structurally identified by NMR analyses in this extract. LC-MS analyses showed the presence of at least 19 additional polar saponins.
Type de document :
Article dans une revue
Phytochemical Analysis, Wiley, 2013, 24 (6), pp.616-622. 〈10.1002/pca.2440〉
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Dernière modification le : mardi 16 janvier 2018 - 10:24:44

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Max Henry, Mariusz Kowalczyk, Mariateresa Maldini, Sonia Piacente, Anna Stochmal, et al.. Saponin Inventory from Argania spinosa Kernel Cakes by Liquid Chromatography and Mass Spectrometry. Phytochemical Analysis, Wiley, 2013, 24 (6), pp.616-622. 〈10.1002/pca.2440〉. 〈hal-01494095〉

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