|
|||||
|
|
High-throughput screening of argan oil composition and authenticity using benchtop 1H NMR |
|
| Authors: | Yvonne Gunning Alex J Jackson Joshua Colmer Fouad Taous Mark Philo Rachel M Brignall Tibari El Ghali Marianne Defernez E Kate Kemsley |
| Institution: | 1. Core Science Resources, Quadram Institute Bioscience, Norwich, UK;2. Anthony Hall Group, Earlham Institute, Norwich, UK;3. Structural and Isotopic Analysis Laboratory, Centre National de l'Energie des Sciences et des Techniques Nucléaires (CNESTEN), Rabat, Morocco;4. Oxford Instruments Magnetic Resonance, Oxford Instruments, Oxford, UK |
| Abstract: | We use 60-MHz benchtop nuclear magnetic resonance (NMR) to acquire 1H spectra from argan oils of assured origin. We show that the low-field NMR spectrum of neat oil contains sufficient information to make estimates of compositional parameters and to inform on the presence of minor compounds. A screening method for quality and authenticity is presented based on nearest-neighbour outlier detection. A variety of oil types are used to challenge the method. In a survey of retail-purchased oils, several instances of fraud were found. |
| Keywords: | argan oil authenticity benchtop NMR spectroscopy edible oil proton NMR triglyceride unsaturates |