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Wyszukujesz frazę "MS spectrometry" wg kryterium: Temat


Tytuł:
Characteristic of tar content and syngas composition during beech updraft gasification
Autorzy:
Kluska, J.
Kazimierski, P.
Ochnio, M.
Kardaś, D.
Powiązania:
https://bibliotekanauki.pl/articles/1191789.pdf
Data publikacji:
2019
Wydawca:
Gdańska Szkoła Wyższa
Tematy:
gasification tar
updraft gasifier
beech wood
GC-MS spectrometry
Opis:
This work aims at study the effect of the operating conditions like equivalence ration and temperature on the updraft gasification of beech wood. The main aspects was to analyze the influence of temperature distribution in the reactor and equivalence ratio on the fuel consumption, syngas composition as well as tar formation characteristics during the gasification process. The light tar content and composition were analysed using gas chromatography coupled with mass spectrometry (GC-MS). Experimental results have shown that the amount of air supplied does not affect the parameters of the gasification process linearly. For lower ER value there was high fuel consumption and high bed temperature in the gasifier, which results in high caloric value of syngas. The results showed that tar yield during updraft gasification depends on the temperature and equivalence ratio. With the increase value of ER and the decrease of temperature on the surface of the bed, the total amount of tar yield increased. The highest temperature on the surface of the bed leads to the smallest tar yield, which can be associated with thermal cracking. The results indicate that both light and heavy tar are changing nonlinearly with different operating conditions. In addition, with decreasing temperature and increasing ER values, the amount of phenol and oxidized aliphatic compounds in the tar samples increased while the BTEX amount decreased. The amount of PAHs, in relation to the temperature and ER, was kept low in all cases.
Źródło:
Eco-Energetics: technologies, environment, law and economy; 2019, 2; 63--78
2657-5922
2657-7674
Pojawia się w:
Eco-Energetics: technologies, environment, law and economy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza MS polipeptydów otrzymywanych z kolagenu: od technologii do ciekawego odkrycia?
MS analysis of polypeptides produced by hydrolysis of collagen: from technology to interesting discovery?
Autorzy:
Mikus, A.
Guziński, J.
Ostrowski, S.
Powiązania:
https://bibliotekanauki.pl/articles/1207249.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem
Tematy:
kolagen
polipeptydy
analiza polipeptydów
spektrometria mas
collagen
polypeptides
analysis of polypeptides
MS spectrometry
Opis:
Zaobserwowano w trakcie analizy MS produktu pozyskiwanego w technologii hydrolizy kolagenu, że cząsteczki otrzymywanych polipeptydów jonizują się ok. 50-krotnie (przy zastosowaniu technik elektrosprej i fotojonizacji pod ciśnieniem atmosferycznym: MS-ESI i MS-APPI). Pozwoliło to opracować szybką i dogodną metodę analizy na potrzeby tej technologii. W artykule podjęto próbę dyskusji nad przyczynami i zaskakującą powtarzalnością obserwowanej multi-jonizacji.
MS analysis of polypeptides, produced during industrial collagen hydrolysis, allowed to observe that multiple ionization of product molecules is approximately equal ca 50+ (using electrospray and atmospheric pressure photoionization techniques: MS-ESI and MS-APPI). This observation brings fast and convenient analytical method for the above technology. In this article, the reasons of the observed unexpected multiionization (and its repeatability) is discussed.
Źródło:
Chemik; 2016, 70, 3; 144-149
0009-2886
Pojawia się w:
Chemik
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Type III CRISPR complexes from Thermus thermophilus
Autorzy:
Szychowska, Marta
Siwek, Wojciech
Pawolski, Damian
Kazrani, Asgar
Pyrc, Krzysztof
Bochtler, Matthias
Powiązania:
https://bibliotekanauki.pl/articles/1038832.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
CRISPR-Cas
endonuclease
Csm
Cmr
Thermus thermophilus
crRNA
mass spectrometry (MS)
chromatography
Opis:
Pathogen-specific acquired immunity in bacteria is mediated by the CRISPR (clustered regularly interspaced short palindromic repeats)-Cas systems. Thermus thermophilus strain HB8 contains CRISPR systems of several major subtypes (type I, IIIA and IIIB), and has become a widely studied model for CRISPR biology. We have selected two highly expressed CRISPR spacers, crRNA 2.1 and crRNA 2.2, and have enriched endogenous T. thermophilus proteins that co-purify with these crRNAs. Mass spectroscopy indicates that the chromatography protocol enriches predominantly Csm complex subunits, but also Cmr subunits. After several chromatographic steps, size exclusion chromatography indicated a molecular mass of the crRNA associated complex of 265±69 kDa. In agreement with earlier work, crRNAs of different lengths (containing the selected spacers) were observed. Most of these were completely lost when several T. thermophilus csm genes were ablated.
Źródło:
Acta Biochimica Polonica; 2016, 63, 2; 377-386
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phytochemical potential of Ficus species for the control of the phytonematode Meloidogyne javanica
Autorzy:
Alves, J.R.
De Assis, J.N.
Padua, C.C.A.
Balbino, H.M.
Lima, L.L.
De Souza Gouveia, A.
Vital, C.E.
Buonicontro, D.S.
De Freitas, L.G.
Leite, J.P.V.
De Oliveira Ramos, H.J.
Powiązania:
https://bibliotekanauki.pl/articles/2082765.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
gas chromatography/mass spectrometry (GC/MS)
metabolite profiling
pest
control
phytochemistry
Opis:
Root-knot nematodes, genus Meloidogyne, are among the most plant damaging pathogens worldwide. The action of natural products against plant pathogens has been investigated to assess their effectiveness in the control of diseases. Thus, the present study aimed to evaluate the phytochemistry potential of the Ficus species for the control of Meloidogyne javanica. In vitro inhibitory activity assays were performed with crude ethanolic extracts of leaves and branches from 10 Ficus species. Among these, Ficus carica extracts exhibited strong paralysis activity against second stage juveniles (J2) (EC50 = 134.90 μg ∙ ml–1 ), after 72 hours. In addition, high efficacy was observed in egg-hatching inhibition at different embryonic stages. Microscopy analysis revealed severe morphological alterations in the nematode tissues at the J2 stage, as well as immotility of juveniles released from eggs in the presence of F. carica extracts. The efficacy of the treatments for the other species was very low. These differences were supported by the variation in the compound classes, mainly for alkaloids and metabolite profiles by Gas Chromatography/Mass Spectrometry (GC/MS) when F. carica was compared with the other species. The results indicated that F. carica is a promising source for the isolation and identification of molecules capable of acting in the control of M. javanica.
Źródło:
Journal of Plant Protection Research; 2020, 60, 2; 193-206
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, antimicrobial activity and structural studies of low molecular mass lysine dendrimers
Autorzy:
Janiszewska, Jolanta
Urbańczyk-Lipkowska, Zofia
Powiązania:
https://bibliotekanauki.pl/articles/1041270.pdf
Data publikacji:
2006
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
basic dendrimers
nuclear magnetic resonance (NMR).
natural antibacterial peptides
mass spectrometry (MS)
antibiotic resistance
Opis:
Four low molecular mass lysine dendrimers were synthesized by Boc chemistry in solution (155 and 169) and Fmoc chemistry on solid support (P2 and P13). The structure and fragmentation mode of the above dendrimers was investigated in gas phase by the LSI-MS and ESI-MS techniques. 1H and 13C NMR analysis in solution (d6-DMSO) allowed to confirm the correct structure. Antimicrobial activities of the dendrimers against Staphylococcus aureus, Escherichia coli and Candida albicans confirmed our hypothesis that the dendrimer structure can be used for construction of molecules interacting with biological membranes.
Źródło:
Acta Biochimica Polonica; 2006, 53, 1; 77-82
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Review of international normatives for natural radioactivity determination in building materials
Autorzy:
Mossini, E.
Macerata, E.
Giola, M.
Mariani, M.
Powiązania:
https://bibliotekanauki.pl/articles/146119.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
acceptability
building materials
gamma spectrometry
inductively coupled plasma mass spectrometry (ICP-MS)
naturally occurring radioactive material (NORM)
Opis:
Anthropogenic activities, such as high-altitude flights and living in buildings, have enhanced the public exposure to natural radiation. In particular, 40K and radionuclides belonging to 232Th and 238U decay chains are present even in building materials, and they may be considered as partially responsible for the effective dose coming from natural radioactivity. Scientists and governments have devoted great attention to the evaluation of the effects produced on the public by naturally occurring radionuclides. In this context, to evaluate the building materials acceptability, accurate and reliable methods for the measurement of the specific activity of natural radioactive isotopes in building materials have been developed. This paper aims to provide a clear and exhaustive review on natural radionuclide measurement procedures. Several standard national normatives (Dutch NEN 5697, Italian UNI 10797, Polish ITB 455), based on gamma spectrometry, have been considered and some critical issues were identified regarding the preparation and the radiometric measuring of the samples. Therefore, the direct measurement of 238U and 232Th by ICP-MS spectrometry as well as the extrapolation of the specific activities without waiting for secular equilibrium have been considered as two promising alternative approaches.
Źródło:
Nukleonika; 2015, 60, No. 3, part 2; 597-602
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Insecticidal activity and chemical composition of essential oil from Artemisia judaica L. against Callosobruchus maculatus (F.) (coleoptera: bruchidae)
Autorzy:
Abd-Elhady, H.K.
Powiązania:
https://bibliotekanauki.pl/articles/961654.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
essential oil
artemisia judaica
insecticidal activity
callosobruchus maculatus
chemical composition
gas chromatographymass spectrometry (gc/ms) analysis
Opis:
The insecticidal properties of essential oil derived via the hydro-distillation method from aerial parts of Artemisia judaica L. were tested against the cowpea weevil, Callosobruchus maculatus (Fab.) (Coleoptera: Bruchidae). The repellent activity assay of essential oil against C. maculates adults indicated that in concentrations of 63.7, 31.9, 15.9, 8.0 or 4.0 μg/cm2, the oil reduced egg laying by 92.5, 86.0, 61.8, 42.7 and 12.5%, respectively. Also, the residual-film assay showed that after 72 hours of treatment, concentrations of 50 and 40% were highly effective against the C. maculates adults. The sub-lethal effects of essential oil were investigated on fecundity and F1 progany by exposing adult females to treated seeds. Both LC25 and LC50 of essential oil significantly reduced F1 progany production compared to the control. The chemical composition of the essential oil was analyzed by GC-MS and the resulting oil piperitone (32.4%), camphor (20.6%) and (E)-ethyl cinnnamate (8.2%) were found to contain the major constituents of the oil. This provided the insecticidal properties of the essential oil against cowpea weevil.
Źródło:
Journal of Plant Protection Research; 2012, 52, 3
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exhaled breath analysis - quantifying the storage of lipophilic compounds in the human body
Analiza wydechu - oznaczanie zawartości związków lipofilowych w organizmie człowieka
Autorzy:
Amann, A.
King, J.
Kupferthaler, A.
Uterkofler, K.
Koc, H.
Teschl, S.
Hinterhuber, H.
Powiązania:
https://bibliotekanauki.pl/articles/126188.pdf
Data publikacji:
2009
Wydawca:
Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:
exhaled breath analysis
isoprene
proton transfer reaction mass spectrometry (PTR-MS)
analiza wydechu człowieka
izopren
metoda reakcji przeniesienia protonu wraz ze spektrometrią mas (PTR-MS)
Opis:
Real-time analysis of exhaled breath is a promising new method to get quantitative information on lipophilic compounds stored in the human body. Some pilot results are presented on isoprene, which is produced as a by-product of the cholesterol synthesis and appears in exhaled breath at concentrations of about 100 parts-per-billion (ppb). The results have been obtained using proton transfer reaction mass spectrometry (PTR-MS) from healthy volunteers undergoing an ergometer challenge test (with 75 W). Peak exhalation flow of isoprene is about 400 nmol/min shortly after start of the challenge. The setup holds great potential in capturing continuous dynamics of non-polar, low-soluble VOCs over a wide measurement range with simultaneous recording of physiological parameters affecting exhalation kinetics.
Przedstawiono wstępne wyniki oznaczenia stężenia izoprenu w wydechu zdrowego człowieka. Izopren jest produktem ubocznym reakcji syntezy cholesterolu. Do oznaczenia zastosowano metodę reakcji przeniesienia protonu przy wykorzystaniu spektrometrii mas (PTR-MS).
Źródło:
Proceedings of ECOpole; 2009, 3, 1; 9-13
1898-617X
2084-4557
Pojawia się w:
Proceedings of ECOpole
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Essential oil composition of different coriander (Coriandrum sativum L.) accessions and their influence on mycelial growth of Colletotrichum spp.
Sklad olejkow eterycznych kolendry (Coriandrum sativum L.) i ich wplyw na wzrost grzybni Colletotrichum spp.
Autorzy:
Aćimović, M.G.
Grahovac, M.S.
Stanković, J.M.
Cvetković, M.T.
Maširević, S.M.
Powiązania:
https://bibliotekanauki.pl/articles/11543291.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
essential oil
coriander
Coriandrum sativum
mycelium growth
Colletotrichum
Colletotrichum acutatum
Colletotrichum gloeosporioides
antifungal activity
gas chromatography-mass spectrometry
GC-MS zob.gas chromatography-mass spectrometry
Opis:
Six coriander accessions of different origins were grown on an experimental field in Mošorin, Serbia during 2014. The GC/MS analysis of the essential oil showed that the major components in all samples were linalool (69.3–72.0%), γ-terpinene (6.0–9.6%) and α-pinene (6.7–8.2%), while other compounds were present at less than 5%. Antifungal activity of coriander oils against two phytopathogenic fungi from Colletotrichum genus (C. acutatum and C. gloeosporioides) was evaluated using the inverted petriplate method. Experiments show that coriander essential oil has antifungal properties against the apple bitter rot pathogens from Colletotrichum genus, but only at higher application rates (≥ 0.16 μl/ml of air). According to the obtained data, it can be concluded that tested coriander accessions differ in essential oil content and composition, as well as in influence on mycelial growth. Coriander essential oil has potential for being applied as a biological control agent against these two fungi from Colletotrichum genus.
Sześć populacji kolendry różnego pochodzenia uprawiano na polu doświadczalnym w Mošorin w Serbii w 2014 roku. Analiza GC/MS olejku lotnego wykazała, że głównymi składnikami we wszystkich próbkach były linalol (69,3–72,0%), γ-terpinen (6,0–9,6%) oraz α-pinen (6,7–8,2%), natomiast inne składniki były obecne w ilości mniejszej niż 5%. Przeciwgrzybicze działanie olejków kolendry względem dwóch grzybów fitopatogenicznych z gatunku Colletotrichum (C. acutatum i C. gloeosporioides) oceniono za pomocą metody odwróconych szalek Petriego. Doświadczenia wykazały, że olejek eteryczny kolendry ma właściwości antygrzybicze względem patogenów gorzkiej zgnilizny jabłoni pochodzących z gatunku Colletotrichum, ale tylko przy większych dawkach aplikacji (≥ 0,16 μl/ml powietrza). Na podstawie uzyskanych danych można wyciągnąć wniosek, że badane populacje kolendry różnią się zawartością olejku eterycznego oraz wpływem na wzrost grzybni. Olejek eteryczny kolendry posiada potencjał jako środek ograniczający dwa grzyby z gatunku Colletotrichum.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2016, 15, 4; 35-44
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The origin and chronology of medieval silver coins based on the analysis of chemical composition
Autorzy:
Pańczyk, E.
Sartowska, B.
Waliś, L.
Dudek, J.
Weker, W.
Widawski, M.
Powiązania:
https://bibliotekanauki.pl/articles/147506.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
elemental composition
medieval Central Europe coins
scanning electron microscopy (SEM)
laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS)
numismatists
Opis:
Medieval Central Europe coins – the Saxon coins, also called as the Otto and Adelheid denarii, as well as the Polish ones, the Władysław Herman and Bolesław Śmiały coins – were examined to determine their provenance and dating. Their attribution and chronology often constitute a serious problem for historians and numismatists. For hundreds of years, coins were in uncontrolled conditions and in variable environment. Destructed and inhomogeneous surface were the effect of corrosion processes. Electron microscopy with energy dispersive X-ray analysis (scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS)), X-ray fluorescence (XRF) analysis (energy dispersive X-ray fluorescence (EDXRF) and total reflection X-ray fluorescence (TXRF)), and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) were applied. The results of these investigations are significant for our knowledge of the history of Central European coinage, especially of Polish coinage.
Źródło:
Nukleonika; 2015, 60, No. 3, part 2; 657-663
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metodyka rozdzielania i oznaczania lotnych inhibitorów fermentacji w brzeczkach fermentacyjnych ciemnej fermentacji, techniką GC-MS
Method for the separation and determination of volatile fermentation inhibitors in broths from dark fermentation, using GC-MS
Autorzy:
Makoś, P.
Słupek, E.
Kamiński, M.
Powiązania:
https://bibliotekanauki.pl/articles/92212.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
biomasa lignocelulozowa
fermentacja ciemna
inhibitory fermentacji
ekstrakcja ciecz-ciecz
chromatografia gazowa
spektrometria mas
GC-MS
fermentation inhibitors
lignocellulosic biomass
dark fermentation
liquid-liquid extraction
gas chromatography-mass spectrometry (GC-MS)
Opis:
W pracy przedstawiono opracowaną w wyniku badań metodykę identyfikacji i oznaczania inhibitorów fermentacji w brzeczkach fermentacji ciemnej z biomasy ligno-celulozowej, z wykorzystaniem ekstrakcji ciecz-ciecz w sprzężeniu z chromatografią gazową ze spektrometrem mas (LLE-GC-MS). W ramach badań dokonano doboru korzystnych warunków ekstrakcji ciecz-ciecz, w tym: pH, objętości rozpuszczalnika ekstrakcyjnego, czasu ekstrakcji oraz warunków wirowania. Opracowana metodyka charakteryzuje się niskimi wartościami granicy wykrywalności (0,0086 – 3,75 mg/L) i oznaczalności, dobrą powtarzalnością i szerokim zakresem liniowości. W próbkach brzeczek fermentacyjnych, zidentyfikowano trzy inhibitory fermentacji (furfural, gwajakol i syringol) w stężeniach w zakresie od 0,04 do 2,45 mg/L. Dodatkowo, osiem innych inhibitorów, w tym głównie lotne kwasy tłuszczowe w stężeniach od 2,86 do 956 mg/L zidentyfikowano w brzeczkach, w trybie SCAN. Wyniki badań, wskazują na konieczność monitorowania przebiegu procesu fermentacji ciemnej w zakresie powstawania inhibitorów fermentacji, których obecność wpływa toksycznie na mikroorganizmy wytwarzające biowodór.
The paper presents the method for the qualitative and quantitative determination of fermentation inhibitors in fermentation broths for bio-hydrogen, using liquid-liquid extraction and gas chromatography with mass spectrometry (LLE-GC-MS). Initially, the extraction parameters were optimized. These included: pH, volume of extraction solvent, pH, extraction time as well as speed of centrifugation. The developed method has low detection limits (0,0086 – 3,75 mg/L), and determination, good repeatability and a wide range of linearity. In fermentation broth samples, three fermentation inhibitors (furfural, guaiacol and syringol) were identified in concentrations ranging from 0.04 to 2.45 mg/L. In addition, eight more inhibitors, mainly volatile fatty acids in concentrations from 2.86 to 956 mg/L, were identified in fermentation broth, using the SCAN mode. The paper demonstrates the need for monitoring inhibitors in fermentation broth during dark fermentation process, due to the fermentation inhibitors are toxic to biohydrogen-producing microorganisms.
Źródło:
Camera Separatoria; 2018, 10, 2; 64-80
2083-6392
2299-6265
Pojawia się w:
Camera Separatoria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Platinum uptake by mustard (Sinapis alba L.) and maize (Zea mays L.) plants
Autorzy:
Kowalska, J.
Asztemborska, M.
Bystrzejewska-Piotrowska, G.
Powiązania:
https://bibliotekanauki.pl/articles/147295.pdf
Data publikacji:
2004
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
platinum
plant samples
voltammetry
mass spectrometry with inductively coupled plasma (ICP-MS)
Opis:
The ability of platinum uptake by hydroponically cultivated plants - Indian mustard (Sinapis alba L.) and Anawa maize (Zea mays L.) - was investigated. The efficiency of the transport of platinum compounds from the roots to above ground organs was estimated. For platinum determination in plant samples, digested in closed system with microwave energy, very sensitive analytical methods were applied - adsorptive stripping voltammetry (AdSV) and mass spectrometry with inductively coupled plasma (ICP-MS). For validation of the obtained results the recovery of platinum was examined. The accumulation factors (AF) of platinum: more then 800 and 400 for roots of Indian mustard and Anawa maize, respectively and about 90 and 30 for above ground organs of both species were found.
Źródło:
Nukleonika; 2004, 49,suppl.1; 31-34
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemical footprint of the solvent soluble extraterrestrial organic matter occluded in Sołtmany ordinary chondrite
Autorzy:
Schmitt-Kopplin, P.
Harir, M.
Kanawati, B.
Tziozis, D.
Hertkorn, N.
Gabelica, Z.
Powiązania:
https://bibliotekanauki.pl/articles/411511.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
ordinary chondrite
extraterrestrial organic matter
carbon
nitrogen
sulphur
meteorite
Sołtmany
nuclear magnetic
resonance spectroscopy (NMR)
Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS)
Opis:
By characterizing organic molecules of extra-terrestrial origin included in the Sołtmany meteorite, we also present the first results of the non-targeted chemical analysis of the methanol soluble organic matter present in an L6 ordinary chondrite. The structural characterization by means of ultrahigh resolution Fourier transform ion cyclotron mass spectrometry (FT-ICR-MS) with electrospray ionization (ESI) in negative and positive modes demonstrated an unexpected and astonishing chemical diversity with several thousand mass peaks that could be converted into C, H, N, O, S, and P elemental compositions. Molecular signatures were typically those of considerably oxygenated CHO and CHOS molecular series of primarily aliphatic character. 1H nuclear magnetic resonance (NMR) spectroscopy confirmed the prevalent existence of pure and functionalized aliphatic spin systems of intermediate chain length (C3-4 units), oxygenated aliphatics and a considerable diversity of oxygenated aromatics in the proton-based abundance ratio near 24 : 2 : 1. Although only residual organic matter allegedly survives in highly thermally altered L6 chondrites, the physical protection of organic matter in microcavities and traps between mineral surfaces might have supported and governed the chemistry with an apparent recalcitrance of extraterrestrial organic matter (EOM). Future studies of the organic matter in ordinary chondrites and its composition and structure in various regimes of (e.g.) temperature, radiation, pressure, and water content could shed light on these meteorites’ formation and evolution.
Źródło:
Meteorites; 2012, 2, No. 1-2; 79-92
2299-0313
2299-1220
Pojawia się w:
Meteorites
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie LC/QQQ w analizie mykotoksyn grzybów termoopornych
Autorzy:
Fornal, E.
Parfieniuk, E.
Czeczko, R.
Frąc, M.
Powiązania:
https://bibliotekanauki.pl/articles/273662.pdf
Data publikacji:
2015
Wydawca:
Roble
Tematy:
owoce miękkie
grzyby termooporne
mykotoksyny
chromatografia cieczowa sprzężona ze spektrometrią mas
HPLC/MS/MS
LC/QQQ
soft fruit
heat-resistant fungi
mycotoxins
liquid chromatography coupled with mass spectrometry
HPLC-MS/MS
Źródło:
LAB Laboratoria, Aparatura, Badania; 2015, 20, 4; 8-11
1427-5619
Pojawia się w:
LAB Laboratoria, Aparatura, Badania
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of distillation time and distillation apparatus on the chemical composition and quality of Lavandula angustifolia Mill. essential oil
Autorzy:
Wesołowska, Aneta
Jadczak, Dorota
Zyburtowicz, Karolina
Powiązania:
https://bibliotekanauki.pl/articles/27315651.pdf
Data publikacji:
2023
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Lavandula angustifolia essential oil
distillation time
distillation apparatus
GC-MS
gas chromatography-mass spectrometry
quality of lavender essential oil
Opis:
In the study, the influence of distillation time as well as distillation apparatus on the chemical composition and quality of lavender (Lavandula angustifolia Mill.) essential oil were investigated. Two different types of distillation apparatuses: Deryng (popular in Poland) and Clevenger-type (recommended by European Pharmacopoeia) were used for the isolation of the essential oil from dried lavender flowers (Lavandulae flos). Moreover, different distillation times (2, 3 and 4 hours) were also applied. The chemical composition of the isolated oils, determined by gas chromatography coupled with mass spectrometry (GC-MS), revealed the dominance of linalool (11.55–17.19%) and linalyl acetate (12.84–16.78%) in the all analyzed samples. Other important constituents were: caryophyllene oxide (5.66–7.35%), lavandulyl acetate (4.64–5.40%) and borneol (4.62–5.51%). On the basis of the obtained data it was proved that the distillation time and distillation apparatus affect the amounts of some constituents in the lavender oil.
Źródło:
Polish Journal of Chemical Technology; 2023, 25, 4; 36--43
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł

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