The Experts below are selected from a list of 18432 Experts worldwide ranked by ideXlab platform
Renato Zenobi - One of the best experts on this subject based on the ideXlab platform.
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detection of diethyl phthalate in Perfumes by extractive electrospray ionization mass spectrometry
Analytical Chemistry, 2009Co-Authors: Konstantin Chingin, Gerardo Gamez, Huanwen Chen, Renato ZenobiAbstract:Recent findings suggest that long-term exposure to diethyl phthalate (DEP), one of the widely used phthalate esters, can lead to serious health problems. Most Perfumes contain non-negligible amounts of DEP. Rapid and sensitive detection of DEP in Perfumes is thus of increasing importance. A novel procedure based on extractive electrospray ionization mass spectrometry (EESI-MS) has been developed for fast detection and identification of DEP in Perfumes without the need for any sample pretreatment. The limit of determination for DEP in Perfume was less than 100 ppb using tandem mass spectrometry on a commercial quadrupole time-of-flight mass spectrometer. The dynamic range of this method was about 4 orders of magnitude. A single sample analysis was completed within a few seconds, providing a rapid way to obtain semiquantitative information on the DEP content in Perfumes. This study shows that both volatile and nonvolatile analytes (e.g., amino acids) in liquids can be directly sampled by neutral desorption,...
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rapid classification of Perfumes by extractive electrospray ionization mass spectrometry eesi ms
Rapid Communications in Mass Spectrometry, 2008Co-Authors: Konstantin Chingin, Gerardo Gamez, Huanwen Chen, Renato ZenobiAbstract:Extractive electrospray ionization mass spectrometry (EESI-MS) was applied to rapid fingerprinting of various Perfumes for quality classification. Unique EESI-MS fingerprints of ten famous brands were obtained. This technique was shown to be applicable to rapid forgery detection on the example of an authentic and a counterfeit ‘Miss Dior’ fragrance by Christian Dior. We believe that the high throughput and simplicity of this sample-preparation-free method can be advantageous in the Perfume industry, for instance when applied to online quality control. Copyright © 2008 John Wiley & Sons, Ltd.
Konstantin Chingin - One of the best experts on this subject based on the ideXlab platform.
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detection of diethyl phthalate in Perfumes by extractive electrospray ionization mass spectrometry
Analytical Chemistry, 2009Co-Authors: Konstantin Chingin, Gerardo Gamez, Huanwen Chen, Renato ZenobiAbstract:Recent findings suggest that long-term exposure to diethyl phthalate (DEP), one of the widely used phthalate esters, can lead to serious health problems. Most Perfumes contain non-negligible amounts of DEP. Rapid and sensitive detection of DEP in Perfumes is thus of increasing importance. A novel procedure based on extractive electrospray ionization mass spectrometry (EESI-MS) has been developed for fast detection and identification of DEP in Perfumes without the need for any sample pretreatment. The limit of determination for DEP in Perfume was less than 100 ppb using tandem mass spectrometry on a commercial quadrupole time-of-flight mass spectrometer. The dynamic range of this method was about 4 orders of magnitude. A single sample analysis was completed within a few seconds, providing a rapid way to obtain semiquantitative information on the DEP content in Perfumes. This study shows that both volatile and nonvolatile analytes (e.g., amino acids) in liquids can be directly sampled by neutral desorption,...
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rapid classification of Perfumes by extractive electrospray ionization mass spectrometry eesi ms
Rapid Communications in Mass Spectrometry, 2008Co-Authors: Konstantin Chingin, Gerardo Gamez, Huanwen Chen, Renato ZenobiAbstract:Extractive electrospray ionization mass spectrometry (EESI-MS) was applied to rapid fingerprinting of various Perfumes for quality classification. Unique EESI-MS fingerprints of ten famous brands were obtained. This technique was shown to be applicable to rapid forgery detection on the example of an authentic and a counterfeit ‘Miss Dior’ fragrance by Christian Dior. We believe that the high throughput and simplicity of this sample-preparation-free method can be advantageous in the Perfume industry, for instance when applied to online quality control. Copyright © 2008 John Wiley & Sons, Ltd.
Gerardo Gamez - One of the best experts on this subject based on the ideXlab platform.
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detection of diethyl phthalate in Perfumes by extractive electrospray ionization mass spectrometry
Analytical Chemistry, 2009Co-Authors: Konstantin Chingin, Gerardo Gamez, Huanwen Chen, Renato ZenobiAbstract:Recent findings suggest that long-term exposure to diethyl phthalate (DEP), one of the widely used phthalate esters, can lead to serious health problems. Most Perfumes contain non-negligible amounts of DEP. Rapid and sensitive detection of DEP in Perfumes is thus of increasing importance. A novel procedure based on extractive electrospray ionization mass spectrometry (EESI-MS) has been developed for fast detection and identification of DEP in Perfumes without the need for any sample pretreatment. The limit of determination for DEP in Perfume was less than 100 ppb using tandem mass spectrometry on a commercial quadrupole time-of-flight mass spectrometer. The dynamic range of this method was about 4 orders of magnitude. A single sample analysis was completed within a few seconds, providing a rapid way to obtain semiquantitative information on the DEP content in Perfumes. This study shows that both volatile and nonvolatile analytes (e.g., amino acids) in liquids can be directly sampled by neutral desorption,...
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rapid classification of Perfumes by extractive electrospray ionization mass spectrometry eesi ms
Rapid Communications in Mass Spectrometry, 2008Co-Authors: Konstantin Chingin, Gerardo Gamez, Huanwen Chen, Renato ZenobiAbstract:Extractive electrospray ionization mass spectrometry (EESI-MS) was applied to rapid fingerprinting of various Perfumes for quality classification. Unique EESI-MS fingerprints of ten famous brands were obtained. This technique was shown to be applicable to rapid forgery detection on the example of an authentic and a counterfeit ‘Miss Dior’ fragrance by Christian Dior. We believe that the high throughput and simplicity of this sample-preparation-free method can be advantageous in the Perfume industry, for instance when applied to online quality control. Copyright © 2008 John Wiley & Sons, Ltd.
Huanwen Chen - One of the best experts on this subject based on the ideXlab platform.
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detection of diethyl phthalate in Perfumes by extractive electrospray ionization mass spectrometry
Analytical Chemistry, 2009Co-Authors: Konstantin Chingin, Gerardo Gamez, Huanwen Chen, Renato ZenobiAbstract:Recent findings suggest that long-term exposure to diethyl phthalate (DEP), one of the widely used phthalate esters, can lead to serious health problems. Most Perfumes contain non-negligible amounts of DEP. Rapid and sensitive detection of DEP in Perfumes is thus of increasing importance. A novel procedure based on extractive electrospray ionization mass spectrometry (EESI-MS) has been developed for fast detection and identification of DEP in Perfumes without the need for any sample pretreatment. The limit of determination for DEP in Perfume was less than 100 ppb using tandem mass spectrometry on a commercial quadrupole time-of-flight mass spectrometer. The dynamic range of this method was about 4 orders of magnitude. A single sample analysis was completed within a few seconds, providing a rapid way to obtain semiquantitative information on the DEP content in Perfumes. This study shows that both volatile and nonvolatile analytes (e.g., amino acids) in liquids can be directly sampled by neutral desorption,...
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rapid classification of Perfumes by extractive electrospray ionization mass spectrometry eesi ms
Rapid Communications in Mass Spectrometry, 2008Co-Authors: Konstantin Chingin, Gerardo Gamez, Huanwen Chen, Renato ZenobiAbstract:Extractive electrospray ionization mass spectrometry (EESI-MS) was applied to rapid fingerprinting of various Perfumes for quality classification. Unique EESI-MS fingerprints of ten famous brands were obtained. This technique was shown to be applicable to rapid forgery detection on the example of an authentic and a counterfeit ‘Miss Dior’ fragrance by Christian Dior. We believe that the high throughput and simplicity of this sample-preparation-free method can be advantageous in the Perfume industry, for instance when applied to online quality control. Copyright © 2008 John Wiley & Sons, Ltd.
Thomas Eltz - One of the best experts on this subject based on the ideXlab platform.
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the evolution of sexual signaling is linked to odorant receptor tuning in Perfume collecting orchid bees
Nature Communications, 2020Co-Authors: Philipp Brand, Ismael A Hinojosadiaz, Ricardo Ayala, M Daigle, Carmen Lucia Yurrita Obiols, Thomas Eltz, Santiago R RamirezAbstract:Sexual signaling is an important reproductive barrier known to evolve early during the formation of new species, but the genetic mechanisms that facilitate the divergence of sexual signals remain elusive. Here we isolate a gene linked to the rapid evolution of a signaling trait in a pair of nascent neotropical orchid bee lineages, Euglossa dilemma and E. viridissima. Male orchid bees acquire chemical compounds from their environment to concoct species-specific Perfumes to later expose during courtship. We find that the two lineages acquire chemically distinct Perfumes and are reproductively isolated despite low levels of genome-wide differentiation. Remarkably, variation in Perfume chemistry coincides with rapid divergence in few odorant receptor (OR) genes. Using functional assays, we demonstrate that the derived variant of Or41 in E. dilemma is specific towards its species-specific major Perfume compound, whereas the ancestral variant in E. viridissima is broadly tuned to multiple odorants. Our results show that OR evolution likely played a role in the divergence of sexual communication in natural populations. Male orchid bees collect scents from the environment to attract females for mating. Here, Brand et al. combine population genomic, Perfume chemistry, and functional analyses to show how divergence in odorant receptor genes may be driving reproductive divergence between two orchid bee species.
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6-(4-Methylpent-3-en-1-yl)naphthalene-1,4-dione, a behaviorally active semivolatile in tibial Perfumes of orchid bees
Chemoecology, 2018Co-Authors: Erik Hedenstrom, Natalia Sjoberg, Fredrik Andersson, Thomas EltzAbstract:Male neotropical orchid bees (Euglossini) collect volatiles from varied sources in their environment to compile complex, species-specific tibial Perfumes, which are later released at mating sites. A major compound prominent in tibial extracts of Euglossa allosticta was purified, as well as isolated and its structure was elucidated by analytical methods including GC–MS, GC–FTIR, HRMS and ^1H and ^13C NMR. After synthesis, the compound with the proposed structure was finally identified as 6-(4-methylpent-3-en-1-yl)naphthalene-1,4-dione. At field sites in Panama and Costa Rica, the synthetic compound attracted males of E. allosticta , but no other euglossines. This strengthens the view that semivolatiles play an important role in conveying specificity to Perfume signals of orchid bees.
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acquisition of species specific Perfume blends influence of habitat dependent compound availability on odour choices of male orchid bees euglossa spp
Oecologia, 2013Co-Authors: Tamara Pokorny, M Hannibal, Jose Javier G Quezadaeuan, Erik Hedenstrom, Natalia Sjoberg, Joakim Bang, Thomas EltzAbstract:Male orchid bees (Euglossini, Apidae, Hymenoptera) expose species-specific blends of volatile chemicals (Perfume bouquets) during their courtship display. The Perfumes are acquired by collecting fragrant substances from environmental sources, which are then accumulated in specialised hind leg pouches. To balance the Perfume composition, the males need to find and collect the required substances in specific relative amounts while facing seasonal, local or habitat-dependent differences in compound availability. Experience-dependent choice of odours, i.e. ‘learned avoidance’ of recently collected components, has been proposed as the mechanism that mediates the accumulation of the stereotypical compound ratios. In the present study, we used the presence of certain compounds in male hind leg pouches as proxy for the respective local compound availability, and investigated whether differences in content are correlated with differences in chemical choice assays. Our results suggest that volatile availability differs between localities (n = 16) as well as habitats (n = 2; coastal vs. inland) across the Yucatan peninsula, Mexico, for both studied species. Male Euglossa dilemma showed a pronounced preference for benzyl benzoate and eugenol at locations where those compounds were rare in hind leg extracts, as predicted by the learned avoidance model. No equivalent correlations were found for Euglossa viridissima. This is the first study to combine chemical analyses of Perfumes with bioassays of odour choice. It strengthens the view that negative feedback from collected odours modifies future chemical choice and helps males to acquire specific Perfume blends.
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Enantioselective Preference and High Antennal Sensitivity for (−)-Ipsdienol in Scent-Collecting Male Orchid Bees, Euglossa cyanura
Journal of Chemical Ecology, 2011Co-Authors: Dirk Louis P. Schorkopf, Lukasz Mitko, Thomas EltzAbstract:Male neotropical orchid bees (Euglossini) collect volatile chemicals from their environment, store them in tibial pouches, and later expose their “Perfumes” during a courtship display. Here, we showed that enantiomeric selectivity plays an important role in the choice of volatiles by male Euglossa cyanura in southern Mexico, and that behavioral selectivity is linked to antennal sensitivity. In field bioassays with equal concentrations of (+)-ipsdienol, (−)-ipsdienol, and racemate, males preferred the (−)-isomer to the racemate, while neglecting the (+)-isomer. Correspondingly, antennae of male E. cyanura showed larger electroantennographic responses to the (−)-isomer than to the (+)-isomer. In comparison, antennae of male Euglossa mixta , which are not attracted to any form of ipsdienol, showed lower electroantennographic responses to (−)-ipsdienol than did antennae of E. cyanura , and also did not differ in sensitivity with respect to the (+)- or (−)-isomers. We suggest that (−)-ipsdienol is an important component of Perfume signals in male E. cyanura, which have undergone selection in favor of increased antennal sensitivity to that enantiomer.