By Hong-Sik Hwang
This short offers a complete review of NMR spectroscopy, protecting ideas comparable to 1H, 13C, and 31P NMR, that are trustworthy instruments to figure out lipid oxidation point, to spot oxidation items, and to explain oxidation mechanism. The short indicates that 1H NMR spectroscopy constantly demonstrates reliability, accuracy, comfort, and merits over traditional analytical equipment in decision of the extent of oxidation of safe to eat oil in the course of frying and garage via tracking adjustments in different proton indications of oil, together with olefinic, bisallylic and allylic protons. this contemporary analytical approach is proven inside this article for use to spot oxidation items, together with basic oxidation items equivalent to hydroperoxides and conjugated dienes and secondary items similar to aldehydes, ketones, epoxides and their derivatives. by means of picking intermediates and ultimate oxidation items, many oxidation mechanisms will be elucidated. a comparatively more moderen procedure, the textual content demonstrates that 13C NMR and 31P NMR spectroscopy may also supply more information at the molecular constitution of an oxidation product. Backgrounds, ideas, and merits over traditional tools, most up-to-date advances, and destiny customers of those equipment are discussed.
Advances in NMR Spectroscopy for Lipid Oxidation evaluation begins by way of masking a few of the mechanisms of lipid oxidation, together with a number of how to make certain oxidation items. NMR spectroscopy is then coated, together with its functions in meals. the following part specializes in 1H NMR Spectroscopy, together with its use for evaluate of lipid oxidation in the course of oil garage and frying. the next part specializes in 13C NMR spectroscopy, together with its use in picking out and settling on oxidation items and mechanisms. a last part specializes in 31<
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Extra resources for Advances in NMR Spectroscopy for Lipid Oxidation Assessment
J Agric Food Chem 58(10):6234–6245. 1021/jf1005337 Gouilleux B, Charrier B, Akoka S, Felpin FX, Rodriguez-Zubiri M, Giraudeau P (2016) Ultrafast 2D NMR on a benchtop spectrometer: applications and perspectives. Trends Anal Chem 83:65–75. 014 Gray JI (1978) Measurement of lipid oxidation: a review. J Am Oil Chem Soc 55(6):539–546. 1007/bf02668066 Guillen MD, Goicoechea E (2009) Oxidation of corn oil at room temperature: primary and secondary oxidation products and determination of their concentration in the oil liquid matrix from 1H nuclear magnetic resonance data.
Dayrit et al. Lucas-Torres et al. (2014) found that the 1,3-diacylglycerols have greater thermal stability than 1,2-diacylglycerols when they monitored the connection changes of 1,2- and 1,3-diacylglycerols using the 31P NMR spectroscopy during heating of olive oil. Some other applications of 13P NMR spectroscopy include the quantification of moisture in olive oils (Hatzakis and Dais 2008) and the determination of phenolic compounds in the polar fraction of virgin olive oil (Christophoridou and Dais 2006).
J Am Oil Chem Soc 53(7):496–501. -S. 1007/978-3-319-54196-9 51 52 References Blümich B (2016) Introduction to compact NMR: a review of methods. Trends Anal Chem 83:2–11. 012 Bolland JL, Koch HP (1945) The course of autoxidation reactions in polyisoprenes and allied compounds. The primary thermal oxidation product of ethyl linoleate. J Chem Soc 1945:445–447. 1039/jr9450000445 Castejón D, Mateos-Aparicio I, Molero MD, Cambero MI, Herrera A (2014) Evaluation and optimization of the analysis of fatty acid types in edible oils by 1H-NMR.
Advances in NMR Spectroscopy for Lipid Oxidation Assessment by Hong-Sik Hwang