Abstract Communesins are rare alkaloids isolated from fungi of the genus Penicillium . In this work, extract a marine‐derived expansum strain was studied using targeted molecular networking approach allowing to detect 65 communesins including 55 new ones. A fragmentation pattern for dimethylvinyl established and script implemented predict structure map all in global network. semisynthetic strategy carried out obtain some minor congeners two B. Nine were then synthetised: them already...

The use of solid-phase microextraction (SPME) coupled with isotope ratio mass spectrometry (IRMS) for the analysis flavor compounds produced by lactic acid bacteria has been evaluated using both liquid and headspace sampling modes. Initially, it was necessary to optimize conditions SPME extraction flavorsdiacetyl acetoinin standard aqueous solutions. effects salt, versus sampling, coating phase were tested. Second, suitability coupling gas chromatography−combustion interface−IRMS (GC-C-IRMS)...

Very little is known about chemical interactions between fungi and their mollusc host within marine environments. Here, we investigated the metabolome of a Penicillium restrictum MMS417 strain isolated from blue mussel Mytilus edulis collected on Loire estuary, France. Following OSMAC approach with use 14 culture media, effect salinity mussel-derived medium metabolic expression were analysed using HPLC-UV/DAD-HRMS/MS. An untargeted metabolomics study was performed principal component...

Marine fungi have been found in all habitats and are able to adapt their environmental niche conditions. In this study, a combination of liquid chromatography coupled high-resolution mass spectrometry (LC-HRMS) gas (GC-MS) analytical approaches was used analyse the metabolic changes marine-sourced Penicillium restrictum strain isolated from marine shellfish area. The P. MMS417 grown on seven different media including an ecological one with two water sources (synthetic seawater distilled...

The flux of carbon into lactic acid, diacetyl and acetoin during the co-metabolism glucose citrate by Lactococcus lactis subsp. biovar. diacetylactis has been determined using natural abundance isotopic ratio analysis. During fermentation in conditions used (glucose, 27.8 mM; citric 13.9 initial pH 6.2–6.4, anaerobic) it is shown that approximately 65% source for aroma compounds derived from carbohydrate. Equally, contributes 30% recovered acid. Thus, there no evidence a metabolic separation...

Two series of synthetic self-complementary isomeric DNA hexamers, namely d(CAGCTG), d(CGATCG) and d(CGTACG) (Mr 1791) d(CATATG), d(TGATCA) d(TGTACA) 1790) were analysed by negative electrospray mass spectrometry. As expected, these hexamers exhibited identical multi-charged deprotonated molecular ions. Low-energy collision-induced dissociation tandem spectrometric analysis the oligonucleotide anions [M — 3H]3− 4H]4− provided characteristic distinct fingerprint patterns which permitted...

Rationale In the field of natural products, de‐replication complex mixtures has become a usual practice to annotate known compounds and avoid their re‐isolation. For this purpose, many groups rely on liquid chromatography coupled high‐resolution mass spectrometry (HPLC/MS) deduce molecular formulae allowing comparison with public or in‐house databases. Electrospray ionization (ESI) is usually considered as method choice for investigating large panel but, in some cases, it may lead unusual...

Abstract An approach combining experimental kinetic isotope effects (KIEs) and quantum chemistry calculations at the DFT level was used to explore mechanism by which CN bond of bicyclic amine nortropine ( 2 ) cleaved during catabolism tropine 1 Pseudomonas bacteria. The working model is that ring opening involves oxidation one bridgehead carbon position cytochrome P450 monooxygenase, followed protonation nitrogen, leads heterolytic cleavage. 15 N H heavy‐atom KIEs for reaction were...

This work presents a simple and easy steady-state distillation method for simultaneously determining the equilibrium isotopic fractionation factor α of different isotopomers compounds at natural abundance in liquid-vapor phase transition. The measurement is precise (<1%) thanks to use 2H NMR hydrogen isotope analysis, which provides site-specific ratios positions molecule. Moreover, heavy elements (C, O, N), their functional groups are measured precisely by ratio mass spectrometry (IRMS). We...

Background: Marine-derived fungi are an underexploited source of lipids for health and nutrition. Little is known about the impact sugar type on lipid diversity produced by a marine-derived fungi. Keywords: Acremonium, fatty acid, glycolipid, lipid, lipidomic, oleaginous fungus, OSMAC approach.

Abstract Electrospray mass spectrometry has aided the structural characterization of a series phosphorothioates and phosphorodithioates as means developing new method for detection these organophosphorus pesticides. Possible fragmentation routes were first obtained by cone voltage dissociation. Low energy collision-activated dissociation (CAD) MS/MS analyses protonated molecular ion [M+H]− confirmed characteristic fingerprint patterns all investigated pesticides also permitted...

The cometabolism of citrate and glucose by growing Lactococcus lactis ssp. bv. diacetylactis was studied using a natural‐abundance stable isotope technique. By judicious choice substrates differing slightly in their 13 C/ 12 C ratios, the simultaneous metabolism to range compounds analysed. These end‐products include lactate, acetate, formate, diacetyl acetoin. All these products have pyruvate as common intermediate. With objective estimating degree which through may be differentially...

Abstract Electrospray mass spectrometry has aided the structural characterization and differentiation of a novel series synthetic difuranic diamine hydrochlorides. As expected, these compounds generally afforded protonated molecules minus two HCI to yield abundant [M + H − 2HCI] pseudomolecular ions, which are equivalent H] ions obtained from corresponding free compounds. Possible fragmentation routes were first by controlled collisionally activated dissociation (CAD) initiated cone‐voltage...

Electrospray mass spectrometIy has aided the structural characterization of ecdysteroid moulting hormones as a means understanding factors controlling cycle in crabs. Possible fragmentation routes were frrst obtained by controlled collision‐activated dissociation (CAD) initiated cone voltage fragmentation. Low energy CAD MSIMS analyses protonated molecules [M+H] + confrrmed characteristic fmgerprint patterns selected intermediate fragments provided additional data and established routes.

Abstract Electrospray mass spectrometry has aided the structural characterization of triazine herbicides standards. Possible fragmentation routes were first obtained by controlled collision-activated dissociation (CAD) initiated cone voltage fragmentation. Low energy CAD MS-MS analyses protonated molecules [M+H]+ confirmed characteristic fingerprint patterns for all investigated and also permitted differentiation isomeric triazines. selected intermediate fragments provided additional data,...

Electrospray mass spectrometry has aided the structural characterization of 3′‐azido‐2′,3′‐dideoxythymidine (AZI) and novel series 3′‐azido‐2′,3′,4′trideoxy‐4′‐thio‐S‐(bromo, chi oro or fluoro )uridine nucleosides their respective α.anomers. Low energy CAD MS/MS analysis protonated molecules [M+H] + confmned predicted fragmentation route for AZT a related 4′‐thio‐S‐halogenouridines. This MSIMS study also provided characteristic fingerprint patterns which permitted differentiation anomers...