Low‐field NMR for quality control on oils

Abstract

Oil is a prominent, but multifaceted material class with a wide variety of applications. Technical oils, crude oils as well as edibles are main subclasses. In this review, the question is addressed how low-field NMR can contribute in oil characterization as an analytical tool, mainly with respect to quality control. Prerequisite in the development of a quality control application, however, is a detailed understanding of the oils and of the measurement. Low-field NMR is known as a rich methodical toolbox that was and is explored and further developed to address questions about oils, their quality, and usability as raw materials, during production and formulation as well as in use.

High-Resolution Magic Angle Spinning (HR-MAS) NMR-Based Fingerprints Determination in the Medicinal Plant Berberis laurina

“…Nuclear magnetic resonance (NMR) is worldwide well-stablished spectroscopic technique that allows to obtain information related to the genotype, phenotype, and intra- and interorganism classifications based on its origin and biological importance, environmental toxicity, and pollution [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ]. In such, NMR spectroscopy is widely used in multidisciplinary “omics”, such as metabolomics, metabolic profiling, fingerprinting, and phenotyping [ 11 , 12 , 13 , 14 ], as well as in identification and structural determination of organic compounds in various samples such as food [ 4 ], ice [ 8 ], serum [ 10 ], environmental [ 15 ], material science [ 16 ], and water [ 17 ].…”

Alkyl Tail Segments Mobility as a Marker for Omega‐3 Polyunsaturated Fatty Acid‐Rich Linseed Oil Oxidative Aging

“…The field of 1 H LF‐NMR energy time relaxometry is a powerful tool for identifying molecular species and to study their dynamics even in complex materials (Berman et al, 2013a, 2015; Resende et al, 2019a, b; Rudszuck et al, 2019; Wiesman et al, 2018). This relates to the measurement of energy time relaxation values as a consequence of interactions among nuclear spins and between spins and their surroundings (matrix).…”

Application of benchtop low‐field NMR spectrometers in the refining industry: A multivariate calibration approach for rapid characterization of crude oils

“…The above data shows that the multivariate calibration approach used in high‐field experiments to extract the information from highly overlapped resonances in complex hydrocarbon mixtures is still applicable at low‐field despite the reduced information content carried by the spectra. This is a positive outcome, not only in view of the comparative ease‐of‐use and significantly lower cost of the low‐field spectrometer but also in terms of the potential fieldable applications for the analysis of other hydrocarbon streams [ 12 ] and new uses in process and reaction monitoring. [ 26,27 ]…”

“…Recently, thanks to the advances in data preprocessing and modeling, low-field NMR spectrometers have been rediscovered for many industrial process applications including quality control and process monitoring of refining streams. [12,13] Most applications on crude oils and petroleum distillates in the literature currently explore time domain (TD) benchtop NMR to predict the quality properties. [14][15][16][17] Barbosa, for example, applies of low-field NMR as an alternative technique to quantify TAN and sulfur content in petroleum, obtaining highly correlated results, [16] while Montes explores a new alternative to determine the aromatic content of petroleum.…”