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- Title
Compositional and Structural Studies of the Major and Minor Components in Three Cameroonian Seed Oils by GC-MS, ESI-FTICR-MS and HPLC.
- Authors
Yeboah, Samuel; Mitei, Yulita; Ngila, Jane; Wessjohann, Ludger; Schmidt, Juergen
- Abstract
The lipid components of three Cameroonian seed oils, ke tchock ( Aframomum arundinaceum), njangsa ( Ricinodendron heudelotii) and calabash nutmeg ( Monodora myristica), have been investigated. Gas chromatography (GC)-mass spectrometry (MS) fatty acid (FA) analysis showed M. myristica seed oil to be dominated by linoleic (49.29%) and oleic (37.17%) acids; R. heudelotii was mainly linoleic (58.73%), followed by stearic (15.00%) and oleic (14.21%) acids; A. arundinaceum was predominantly oleic (65.76%) and palmitic (20.36%) acids. Electrospray ionization (ESI)-Fourier transform ion cyclotron resonance (FTICR)-MS analysis showed seven major triacylglycerol (TAG) classes for M. myristica, with C54:5, C54:4 and C54:6 dominating. R. heudelotii had eight major TAG classes with C54:8, C54:7 and C54:6 being most abundant. A. arundinaceum also had eight major TAG classes with C52:2, C54:3 and C50:2 dominating. C nuclear magnetic resonance (NMR) analysis of the TAGs showed that both sn-1,3 and sn-2 positions were predominantly occupied by linoleoyl and oleoyl chains. High-performance liquid chromatography (HPLC) fluorescence detector (FLD) analysis showed that M. myristica contained only α- and β-tocopherols (195.40 and 73.95 µg/g, respectively), R. heudelotii contained mainly γ-tocopherol (289.40 µg/g), and A. arundinaceum had mainly γ- and β-tocopherols (236.78 and 124.93 µg/g, respectively). GC-MS analysis of the unsaponifiable matter showed that β-sitosterol was the most abundant phytosterol in all three seed oils. The absolute amounts of 4-desmethylsterols were 196.15, 608.71 and 362.15 µg/g for M. myristica, R. heudelotii and A. arundinaceum seed oils, respectively. These compositional and structural studies provide justification for the use of all three seed oils in food products.
- Subjects
VEGETABLE oils; MOLECULAR structure; GAS chromatography/Mass spectrometry (GC-MS); HIGH performance liquid chromatography; RICINODENDRON; MONODORA; FATTY acids; GLYCERIN
- Publication
Journal of the American Oil Chemists' Society (JAOCS), 2011, Vol 88, Issue 10, p1539
- ISSN
0003-021X
- Publication type
Article
- DOI
10.1007/s11746-011-1832-x