31P NMR analysis of phospholipids in crude extracts from different sources: improved efficiency of the solvent system
✍ Scribed by Nicola Culeddu; Marco Bosco; Renato Toffanin; Piero Pollesello
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 101 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Crude lipid extracts from di †erent tissues were analysed by 31P NMR spectroscopy in a mixture of triethylamine, dimethylformamide and guanidinium chloride. Higher dispersion of the 31P NMR signals and better reproducibility of the chemical shifts were achieved with respect to the spectra acquired in the conventional chloroformÈmethanolÈwater solvent. In particular, the reproducibility of the chemical shifts allowed the unambiguous identiÐcation of all the components in the 31P NMR spectra of complex phospholipid mixtures, which was not feasible using the chloroformÈmethanolÈwater system. The efficiency of the new solvent was tested on crude lipid extracts from di †erent biological sources such as lecithin, mouse mammary carcinoma, porcine stomach, porcine spleen, porcine brain, human red blood cells, yeast, fungi and tuna Ðsh muscle. The reproducibility of the chemical shift of the phospholipid signals was demonstrated in the presence of various amounts of neutral lipids (triglycerides) and sterols, which are commonly present in the Folch extracts.