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Quantitative Measurement of Major Secoiridoid Derivatives in Olive Oil Using qNMR. Proof of the Artificial Formation of Aldehydic Oleuropein and Ligstroside Aglycon Isomers
- Source :
- Journal of Agricultural and Food Chemistry. 62:600-607
- Publication Year :
- 2014
- Publisher :
- American Chemical Society (ACS), 2014.
-
Abstract
- A previously developed method for measurement of oleocanthal and oleacein in olive oil by quantitative (1)H NMR was expanded to include the measurement of the monoaldehydic forms of oleuropein and ligstroside aglycons. The method was validated and applied to the study of 340 monovarietal Greek and Californian olive oils from 23 varieties and for a 3-year period. A wide variation concerning the concentrations of all four secoiridoids was recorded. The concentration of each one ranged from nondetectable to 711 mg/kg and the sum of the four major secoiridoids (named as D3) ranged from nondetectable to 1534 mg/kg. Examination of the NMR profile of the olive oil extract before and after contact with normal or reversed stationary chromatography phase proved the artificial formation of the 5S,8S,9S aldehydic forms of oleuropein and ligstroside aglycon isomers during chromatography. Finally, methyl elenolate was identified for the first time as a minor constituent of olive oil.
- Subjects :
- Magnetic Resonance Spectroscopy
Chromatography
Quantitative nmr
Iridoid Glucosides
General Chemistry
chemistry.chemical_compound
Glucosides
Isomerism
chemistry
Oleuropein
Oleocanthal
Proton NMR
Plant Oils
Organic chemistry
Iridoids
General Agricultural and Biological Sciences
Olive Oil
Pyrans
Olive oil
Subjects
Details
- ISSN :
- 15205118 and 00218561
- Volume :
- 62
- Database :
- OpenAIRE
- Journal :
- Journal of Agricultural and Food Chemistry
- Accession number :
- edsair.doi.dedup.....a66abc03b5a2c5c76d6046df48a0bad0