Search results for "GC-MS"
showing 10 items of 96 documents
Estudio del biodeterioro en resinas alquídicas usadas como aglutinante en pinturas modernas mediante espectroscopía FTIR y pirólisis-cromatografía de…
2008
Evaluation of the alteration produced by microbiological attack on alkyd resins has been carried out by FTIR spectroscopy and Pyrolysis-Gas Chromatography/Mass Spectrometry (Py-GC/MS). The latter included the online derivatisation of alkyd resins using hexamethyldisilazane during pyrolysis. Specimens consisting of thin films of resins formed on glass slides were used. Analyses performed on the specimens in which different genera of bacteria and fungi were inoculated and allowed to grow, indicate that the attack of microorganisms encourages the scissioning of the polymeric resins and the appearance of short-chain fatty acids. IR bands ascribed to carboxylic acids appearing in samples from in…
Chemistry and functional properties in prevention of neurodegenerative disorders of five Cistus species essential oils.
2013
The chemical composition of Cistus creticus, Cistus salvifolius, Cistus libanotis, Cistus monspeliensis and Cistus villosus essential oils has been examined by GC and GC–MS analysis. Height-nine constituents were identified in C. salvifolius oil, sixty in C. creticus, fifty-six in C. libanotis, fifty-four in C. villosus, forty-five in C. monspeliensis. Although the five species belong to the same genus, the composition showed interesting differences. Essential oils were screened also for their potential antioxidant effects (by DPPH, ABTS, FRAP and b-carotene bleaching test) and their acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) inhibitory activity, useful for prevention and …
Analysis of furan in toasted coffee by HS/SPME-GC-MS
2008
GC-MS as a tool to study the aromatic profiles of Candida zemplinina/ Saccharomyces cerevisiae mixed fermentation wines
2013
EVALUMION OF THE CHEMICAL PHYSICAL DIFFERENCES AMONG SICILIAN HONEYS
2009
Gaistošo organisko savienojumu emisijas no kuņģa vēža audiem un to potenciālā bioloģiskā saistība
2018
Gaistošā organiskā savienojuma (VOC) emisija, ko var novērot izelpā, ir strauji augoša diagnostikas metode audzēju izmeklēšanā. VOC ir savienojums, kam istabas temperatūrā ir augsts tvaika spiediens, kas veicina tā iztvaikošanu gāzes formā. Šo gāzi var noteikt cilvēka audos un šķidrumos.( Haick et al 2014) Galvenokārt ir pētīta VOC saistība ar plaušu vēzi. Taču aizvien vairāk tiek veikti pētījumi, lai noteiktu, kādas ir iespējas VOC pielietot arī kuņģa audzēja gadījumā. Tā kā VOC molekula spēj mijiedarboties ar šūnu metabolītiem, apkārtējo vido, mikrobiem u.c., ir grūti saprast tā rašanās vietu. Šajā pētījumā tiks izmeklētas potenciālās savienojuma vietas, no kurām tas cēlies. Ir dažādi vie…
Study on Trichothecene and Zearalenone Presence in Romanian Wheat Relative to Weather Conditions
2019
To evaluate the influence of weather conditions on mycotoxin presence in wheat, deoxynivalenol (DON), 3-acetyldeoxynivalenol (3AcDON), 15-acetyldeoxynivalenol (15AcDON), fusarenon-X (FUS-X), nivalenol (NIV), HT-2 toxin (HT-2), T-2 toxin (T-2), diacetoxyscirpenol (DAS), neosolaniol (NEO) and zearalenone (ZEN) were evaluated in 102 Romanian wheat samples coming from five wheat growing areas during 2015. Only six mycotoxins were detected, while FUS-X, DAS, NEO and NIV were not present in the wheat samples. Mycotoxin concentrations were correlated with precipitation and temperature values during anthesis and the preharvest period. Overall, the highest frequency was registered for DON, while the…
New insights into the composition of historical remedies and pharmaceutical formulations: the identification of natural resins and balsams by gas chr…
2020
AbstractThe present paper reports one of the first studies on the identification of natural resins and balsams in modern era drug formulations. Gas chromatography coupled with mass spectrometry (GC-MS) was applied to investigate the composition of ancient remedies and pharmaceutical formulations coming from the Spezieria di Santa Maria della Scala in Rome, founded at the end of the seventeenth century by the Discalced Carmelites. The obtained results highlight the presence of complex mixtures containing resinaceous and lipidic-based compounds. Thanks to the detection of characteristic markers, it was possible to identify several natural resins, such as guaiacum resin, ladano resin and scamm…
Comparison between Different Techniques for Volatiles Analyses in Coriander (Coriandrum sativum L.)
2011
Although many papers have been devoted to the study of Coriander fruits aromatic pattern, many differences show up according not only to the provenience of seeds, but also to the analytical methods chosen. In our work, samples from one Coriander small-seeded biotype has been analysed, verifying the differences between (1) the oil extracted by means of a Soxhlet apparatus (2) the same oil sampled by means of HS-SPME and (3) the HS-SPME on the roughly ground seeds, all analysed by direct injection in the GC-MS. The volatile composition detected by means of HS-SPME on oil resembles tightly that performed on Soxhlet extract. With respect to the direct injection, the HS-SPME shows a higher sensi…