Advances in NMR Spectroscopy for Lipid Oxidation Assessment by Hong-Sik Hwang

By Hong-Sik Hwang

This short offers a accomplished evaluate of NMR spectroscopy, overlaying thoughts 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 exhibits that 1H NMR spectroscopy consistently demonstrates reliability, accuracy, comfort, and benefits over traditional analytical equipment in selection of the extent of oxidation of suitable for eating oil in the course of frying and garage via tracking adjustments in numerous proton indications of oil, together with olefinic, bisallylic and allylic protons. this contemporary analytical technique is proven inside of this article for use to spot oxidation items, together with basic oxidation items corresponding to hydroperoxides and conjugated dienes and secondary items equivalent to aldehydes, ketones, epoxides and their derivatives. through deciding on intermediates and ultimate oxidation items, many oxidation mechanisms should be elucidated. a comparatively more moderen process, the textual content demonstrates that 13C NMR and 31P NMR spectroscopy may also offer additional info at the molecular constitution of an oxidation product. Backgrounds, rules, and merits over traditional tools, newest advances, and destiny customers of those equipment are discussed.

Advances in NMR Spectroscopy for Lipid Oxidation overview begins by means of overlaying a number of the mechanisms of lipid oxidation, together with a variety of how you can make sure oxidation items. NMR spectroscopy is then lined, together with its functions in meals. the following part makes a speciality of 1H NMR Spectroscopy, together with its use for evaluation of lipid oxidation in the course of oil garage and frying. the next part makes a speciality of 13C NMR spectroscopy, together with its use in deciding upon and choosing oxidation items and mechanisms. a last part makes a speciality of 31<

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The theory behind this method is that there are molecular structure and composition changes in oil during the oil degradation process, affecting the chemical environment surrounding the protons. Thus, the proton mobility affecting the NMR proton relaxation times changes as oil degrades. Another group also examined the correlation between the relaxation time in NMR spectroscopy and the total polar compounds (TPC) (Hein et al. 1998) in an attempt to develop a new analytical method to replace the time and chemical consuming TPC method.

11 ppm) proton signals showed very similar trends to the polymerized triacylglycerols (PTAG) values determined by GPC analysis. The same 1H NMR method was used to determine antioxidant activities of different steryl ferulates in a frying study, in which potato chips were fried in soybean oil at 180 °C (Winkler-Moser et al. 2015). Three other separate heating studies with soybean oil at 180 °C (Hwang and Winkler-Moser 2014; Hwang et al. 2014; Winkler-­Moser et al. 2013) also showed that the 1H NMR method was a very convenient analytical method to determine the oxidation level of soybean oil.

4 Fatty acid compositions and NMR signals of soybean oil (SBO), mid-oleic sunflower oil (NuSun) and high oleic soybean oil (HOSBO) (Hwang et al. 4 shows fatty acid compositions and NMR signals of fresh oils used in this study. Oleic acid (C18:1) oxidizes much slower than linoleic acid (18:2) and linolenic acid (18:3). Therefore, high oleic oils are recognized as the most promising alternatives to hydrogenated oils containing trans fats and/or highly saturated fats and tropical oils rich in saturated fats.

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