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- W2133414203 abstract "Abstract The isolation, purification and analysis of the lipid A obtained from Mesorhizobium loti Ayac 1 BII strain is presented. Analysis of the carbohydrate moiety after acid hydrolysis by high‐pH anion‐exchange chromatography with pulse amperometric detection (HPAEC‐PAD) showed the presence of glucosamine and galacturonic acid as the only sugar components. Gas chromatographic (GC) and GC/mass spectrometric (MS) analysis of the fatty acids revealed the presence of 3‐OH‐C12:0; 3‐OH‐C13:0; 3‐OH‐C20:0 and 27‐OH‐C28:0 among the major hydroxylated species. In addition, C16:0, C17:0, C18:0 and C 20:0 were shown as main saturated fatty acids. Different polyacylated species were evidenced by thin layer chromatography of lipid A, allowing the purification of two fractions. Ultraviolet matrix‐assisted laser desorption/ionization time‐of‐flight (UV‐MALDI‐TOF) MS analysis with different matrices, in the positive‐ and negative‐ion mode, was performed. The fast moving component revealed the presence of hexa‐acylated species, varying in the fatty acid composition. Species containing three 3‐OH fatty acids and a 27‐OH‐C28:0 fatty acid were observed. Individual ions within this family differ by ±14 mass units. The slow moving component was enriched mainly in penta‐acylated species. Among them, three subgroups were detected: the major one compatible with the sugar core bearing two 3‐OH 20:0 fatty acids, a 3‐OH 13:0 or a 3‐OH 12:0 fatty acid, a 27‐OH 28:0 fatty acid and one saturated fatty acid. Each signal differs in a C18:0 acyl unit from the corresponding hexa‐acylated family. On the other hand, a subgroup bearing one 3‐OH 20:0 fatty acid, one 27‐OH 28:0 fatty acid and two non‐polar fatty acids was shown. A minor subgroup compatible with structures containing two hydroxylated and three non‐polar fatty acids was also detected. The results obtained showed that nor ‐harmane was an excellent matrix for charged lipid A structural studies in both, positive and negative ion modes. Copyright © 2006 John Wiley & Sons, Ltd." @default.
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- W2133414203 date "2006-06-16" @default.
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- W2133414203 title "A matrix-assisted laser desorption/ionization mass spectrometry approach to the lipid A fromMesorhizobium loti" @default.
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- W2133414203 doi "https://doi.org/10.1002/rcm.2575" @default.
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