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Distribution and mobility of phosphates and sodium ions in cheese by solid-state 31P and double-quantum filtered 23Na NMR spectroscopy Inra
Gobet, M.; Rondeau-Mouro, C.; Buchin, S.; Le Quéré, J.L.; Guichard, E.; Foucat, L.; Moreau, C..
The feasibility of solid-state magic angle spinning (MAS) 31P nuclear magnetic resonance (NMR) spectroscopy and 23Na NMR spectroscopy to investigate both phosphates and Na+ ions distribution in semi-hard cheeses in a non-destructive way was studied. Two semi-hard cheeses of known composition were made with two different salt contents. 31P Single-pulse excitation and cross-polarization MAS experiments allowed, for the first time, the identification and quantification of soluble and insoluble phosphates in the cheeses. The presence of a relatively mobile fraction of colloidal phosphates was evidenced. The detection by 23Na single-quantum NMR experiments of all the sodium ions in the cheeses was validated. The presence of a fraction of bound sodium ions was...
Tipo: Journal Article Palavras-chave: NMR; 23NA; 31P; DOUBLE-QUANTUM FILTER; MAGIC ANGLE SPINNING; SOLID STATE; BOUND SODIUM IONS; PHOSPHATE DISTRIBUTION; SEMI-HARD CHEESE.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20109877c5f4&uri=/notices/prodinra1/2010/07/
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Sesquiterpenes in the frontal gland secretions of nasute soldier termites from new guinea Inra
Everaerts, C.; Roisin, Y.; Le Quéré, J.L.; Bonnard, O.; Pasteels, J.M..
In five New Guinea Nasutitermes (N. gracilirostris, N. novarumhebridarum, N. torresi, N. triodiae, and an undescribed species N. sp.F), we have detected and identified 10 sesquiterpenes. Eight of these compounds (β)-elemene,β-caryophyllene,α-humulene,α-muurolene,γ-selinene,β-selinene, germacrene-A, and γ2-cadinene) were identified by GC and GC-MS (EI). Two uncommon sesquiterpenes, (5R*, 7R*, 10S*)-selina-4(14),11-diene and (5R*, 7R*, 10S*)-selina-3,11-diene, were identified by GC, GC-MS (EI, CI), GC-FTIR, and mono- and bidimensional NMR. Whereas in most species sesquiterpenes are present in low or trace amounts, inN. novarumhebridarum the sesquiterpenic fraction of soldier frontal gland secretion is equal to that of the monoterpenes.
Tipo: Journal Article Palavras-chave: RESONANCE MAGNETIQUE NUCLEAIRE; TERMITE; SESQUITERPENE; NASUTITERMES; TERMITIDAE; CHROMATOGRAPHIE EN PHASE GAZEUSE; SPECTROMETRIE DE MASSE; IDENTIFICATION BIOCHIMIQUE; GLANDE EXOCRINE NASUTITERMES; ISOPTERA; DEFENSE SECRETION; SESQUITERPENES.
Ano: 1993 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB9400031846042348&uri=/notices/prodinra1/2010/11/
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The male abdominal glands of Leucophaea maderae: chemical identification of the volatile secretion and sex pheromone function Inra
Farine, J.P.; Sirugue, D.; Abed-Vieillard, D.; Everaerts, C.; Le Quéré, J.L.; Bonnard, O.; Brossut, R..
In Leucophaea maderae, male calling behavior involves the release of a sex pheromone from the abdominal sternal glands. An extract of sternal glands attracted conspecific females over a distance. The compounds present were identified as hydroxy-3-butan-2-one, (2R, 3R)-butanediol, senecioic acid, and (E)-2-octenoic acid. The same components are also present in male tergal glands. The identified compounds were tested on their own and in mixtures. Their biological function is discussed
Tipo: Journal Article Palavras-chave: COCKROACH; HYDROXY-3-BUTAN-2-ONE; (2 3)-BUTANEDIOL; 3-METHYL-2-BUTENOIC ACID; SENECIOIC ACID; (E)-2-OCTENOIC ACID; SEX PHEROMONE; SEXUAL BEHAVIOR.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20085f0e0536&uri=/notices/prodinra1/2010/11/
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