Application of Capillary GC/MS to the Analysis of Wastes from Chemical Plants. II. Identification of Naphthyl[b]thiophenes and Binaphthyls in Gaseous Releases from the Production of 2-Naphthol

1994 ◽  
Vol 59 (1) ◽  
pp. 119-125 ◽  
Author(s):  
Jiří Čermák ◽  
Miloslav Sebránek ◽  
Jiří Kulhánek
Keyword(s):  
Mass Spectra ◽  
Retention Data ◽  
Chemical Plants ◽  
Capillary Gc

Naphthyl[b]thiophenes were identified in gaseous releases from the production of 2-naphthol based on the elucidation of their mass spectra. The identification was verified by comparison with mass spectra and retention data of the authentic compounds which were synthesized for this purpose. Three isomeric binaphthyls were also found in the industrial releases.

scholarly journals Combination of capillary GC, GC/MS and13C-NMR for the characterization of the rhizome oil ofPiper betleL. (Piperaceae) from Vietnam

1997 ◽  
Vol 13 (2) ◽  
pp. 131-136 ◽  
Author(s):  
Lê Thanh ◽  
Nguyên Xuân Dung ◽  
Ange Bighelliand ◽  
Joseph Casanova ◽  
Piet A. Leclercq
Keyword(s):  
Essential Oil ◽  
Structure Elucidation ◽  
Mass Spectra ◽  
Piper Betle ◽  
Retention Data ◽  
Capillary Gc ◽  
Nmr Studies ◽  
Identification Techniques ◽  
C Nmr

The essential oil from the rhizomes ofPiper betleL. (betel), collected around Hue, was obtained in 0.20% yield. The oil was examined by a combination of capillary GC and GC/MS.13C-NMR studies confirmed the structure assignments proposed by retention data and mass spectra of the components with a content higher than 1%. In some instances the structure elucidation based on GC and GC/MS data had to be corrected. More than forty constituents were found of which the major ones were α-cadinol (26.2%), δ-cadinene (11.7%), and about equal amounts of T-cadinol and T-muurolol (unseparated, together 20.7%). This study clearly illustrates the advantage of complementary identification techniques.

Composition and origin of milky water in the North Sea

1980 ◽  
Vol 60 (3) ◽  
pp. 759-768 ◽  
Author(s):  
J. K. Volkman ◽  
R. R. Gatten ◽  
J. R. Sargent
Keyword(s):  
North Sea ◽  
Mass Spectra ◽  
Oxidative Degradation ◽  
Wax Esters ◽  
Calanus Finmarchicus ◽  
Wax Ester ◽  
Capillary Gc ◽  
The North ◽  
The North Sea ◽  
Calanus Species

An occurrence of ‘milky water’ which covered a wide area of the North Sea in June 1975 is described. The water contained 20 mg/1 of an oil which was shown by capillary GC-MS to consist mainly (> 80%) of two wax esters 34:1 and 36:1. Analysis of the acids and alcohols released by hydrolysis, and interpretation of the wax ester mass spectra, indicated that the 34:1 ester was almost entirely composed of the alcohol-acid combination 20:1–14:0 and the 36:1 ester was composed of 22:1–14:0 (75%) and 20:1–16:0 (19%). Wax esters of virtually the same composition predominate in the lipids of the copepod Calanus finmarchicus which has the implication that the ‘milky water’ was caused by ageing of the oil released following a mass mortality of copepods. The lack of polyunsaturated wax esters and of astaxanthin is ascribed to oxidative degradation of these labile lipids following release into the sea. A copepod origin for the milky water is further supported by its containing small amounts of cholesterol and pristane, both of which are common to Calanus species.

Die verzweigten Fettsäuren von Staphylococcus aureus, eine gaschromatographisch-massenspektrometrische Analyse / The Branched Chain Fatty Acids of Staphylococcus aureus, a Gas Chromatographic-Mass Spectrometric Analysis

1971 ◽  
Vol 26 (9) ◽  
pp. 893-901 ◽  
Author(s):  
Heinz Egge ◽  
Uwe Murawski ◽  
Wirapong Chatranon ◽  
Fritz Zilliken
Keyword(s):  
Fatty Acids ◽  
Staphylococcus Aureus ◽  
Mass Spectra ◽  
Spectrometric Analysis ◽  
Total Lipid Extract ◽  
Retention Data ◽  
Branched Chain Fatty Acids ◽  
Branched Chain ◽  
Chromatographic Mass ◽  
Chain Fatty Acids

The fatty acid methylesters prepared by transesterification of the total lipid extract of Staphylococcus aureus Wood 46 were analysed by gas chromatography on thin film capillaries coated with polyphenylether (OS 138), siliconerubber (SE 30) and S.C.O.T. columns coated with Diethyleneglycoladipatepolyester (DEGA) in combination with mass spectrometry. Among the branched chain fatty acids ranging from C11- C21 the iso- and anteiso-C15 acids are predominant.In the group of the C15 and C17 acids branching in position 9 and 10 was also found. No unsaturated branched chain fatty acids could be detected. Retention data and mass spectra of the branched chain fatty acids are presented.

Correlation Between GC Retention Data and Relative Molecular Weight of N,N-Bis(2,2,2-trifluoroethyl)dithiocarbamates of Some Divalent Metals

1996 ◽  
Vol 61 (11) ◽  
pp. 1609-1614 ◽  
Author(s):  
Ján Hrouzek ◽  
Ján Krupčík ◽  
Ivan Skačáni
Keyword(s):  
Molecular Weight ◽  
Correlation Coefficients ◽  
Retention Indices ◽  
Chromatographic Retention ◽  
Retention Data ◽  
Capillary Gc ◽  
Data Retention ◽  
Divalent Metals ◽  
Relative Molecular Weight ◽  
Linear Retention Indices

The correlation of gas-chromatographic retention data (retention times and linear retention indices) and relative molecular weight was examined for N,N-bis(2,2,2-trifluoroethyl)dithiocarbamate chelates of some divalent metals. Regression analysis of data obtained by capillary GC on a non-polar column heated by applying a dual-ramp temperature programme gave linear dependences possessing reasonable correlation coefficients.

Application of capillary GC-MS to analyses of wastes from chemical plants. Identification of N-arylphthalimides in naphthalenic pitches

1991 ◽  
Vol 56 (4) ◽  
pp. 809-821 ◽  
Author(s):  
Jiří Čermák ◽  
Miloslav Sebránek ◽  
Zora Nývltová ◽  
Josef Jirman
Keyword(s):  
Spectral Analysis ◽  
Nitrogen Compounds ◽  
Chemical Plants ◽  
Capillary Gc ◽  
Mass Spectral Analysis ◽  
Chromatographic Data ◽  
Mass Spectral

A number of interesting nitrogen compounds have been identified in naphthalenic pitches and their extracts, viz. N-phenyl, N-methylphenyl, and N-(dimethylphenyl)phthalimides. Their structure has been derived from mass spectral analysis and confirmed by comparison with MS and elution data of the authentic standards prepared. Also discussed are the MS, NMR and chromatographic data of N-arylphthalimides and corresponding N-arylphthalisoimides.

Correlation of γ-radioactivity and Scanning Electron Microscopy in measurement of retention of 111Indium-labeled canine endothelial cells on synthetic vascular grafts

1989 ◽  
Vol 47 ◽  
pp. 886-887
Author(s):  
E.J. Prendiville ◽  
S. Laliberté Verdon ◽  
K. E. Gould ◽  
K. Ramberg ◽  
R. J. Connolly ◽  
...  
Keyword(s):  
Blood Flow ◽  
Ex Vivo ◽  
Vascular Grafts ◽  
Retention Data ◽  
Vascular Prostheses ◽  
Group 4 ◽  
Human Fibronectin ◽  
Insufficient Time ◽  
Group 3 ◽  
Group 2

Endothelial cell (EC) seeding is postulated as a mechanism of improving patency in small caliber vascular grafts. However the majority of seeded EC are lost within 24 hours of restoration of blood flow in previous canine studies . We postulate that the cells have insufficient time to fully develop their attachment to the graft surface prior to exposure to hemodynamic stress. We allowed EC to incubate on fibronectin-coated ePTFE grafts for four different time periods after seeding and measured EC retention after perfusion in a canine ex vivo shunt circuit.Autologous canine EC, were enzymatically harvested, grown to confluence, and labeled with 30 μCi 111 Indium-oxine/80 cm 2 flask. Four groups of 5 cm x 4 mm ID ePTFE vascular prostheses were coated with 1.5 μg/cm.2 human fibronectin, and seeded with 1.5 x 105 EC/ cm.2. After seeding grafts in Group 1 were incubated in complete growth medium for 90 minutes, Group 2 were incubated for 24 hours, Group 3 for 72 hours and Group 4 for 6 days. Grafts were then placed in the canine ex vivo circuit, constructed between femoral artery and vein, and subjected to blood flow of 75 ml per minute for 6 hours. Continuous counting of γ-activity was made possible by placing the seeded graft inside the γ-counter detection crystal for the duration of perfusion. EC retention data after 30 minutes, 2 hours and 6 hours of flow are shown in the table.

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