Iodinated Organic Compounds as Contrast Media for Radiographic Diagnoses. II. Ethyl Esters of Iodinated Straight and Branched Chain Phenyl Fatty Acids1

1943 ◽  
Vol 65 (7) ◽  
pp. 1273-1276 ◽  
Author(s):  
John T. Plati ◽  
William H. Strain ◽  
Stafford L. Warren
Keyword(s):  
Contrast Media ◽  
Organic Compounds ◽  
Ethyl Esters ◽  
Branched Chain

Volatile fraction and sensory characteristics of Manchego cheese. 2. Seasonal variation

2002 ◽  
Vol 69 (4) ◽  
pp. 595-604 ◽  
Author(s):  
ESTRELLA FERNÁNDEZ-GARCÍA ◽  
CARMEN SERRANO ◽  
MANUEL NUÑEZ
Keyword(s):  
Seasonal Variation ◽  
Raw Milk ◽  
Ethyl Esters ◽  
Volatile Fraction ◽  
Secondary Alcohols ◽  
Methyl Ketones ◽  
Seasonal Differences ◽  
Manchego Cheese ◽  
Branched Chain ◽  
Autumn And Winter

An automatic purge and trap apparatus, coupled to a GC-MS was used to study the seasonal variability of the volatile fraction of raw milk Manchego cheese. Both season and dairy significantly affected abundance of most volatile compounds. Most aldehydes, methyl ketones, n-alcohols, and secondary alcohols reached significantly higher concentrations in spring cheeses. Branched chain alcohols showed significantly higher concentrations in autumn and winter cheeses, while significantly higher amounts of diketones were found in summer cheeses. Most ethyl esters reached higher concentrations in spring and winter cheeses and lower in autumn cheeses. Lower concentrations of α-pinene were found in spring cheeses, and higher amounts of limonene were observed in winter cheeses. Heptane and octane were significantly more abundant in summer cheeses. No significant seasonal differences were found either for quality or intensity scores.

Identification of Non-Volatile Components and Volatile Organic Compounds in Wet Building Materials

2012 ◽  
Vol 253-255 ◽  
pp. 825-828
Author(s):  
Jing Chen ◽  
Neng Zhu
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Building Materials ◽  
Gas Chromatography Mass Spectrometry ◽  
Volatile Components ◽  
Acrylic Emulsion ◽  
Volatile Organic ◽  
Pre Treatment ◽  
Branched Chain ◽  
Styrene Butadiene

The major volatile components in two solvent-based paints, two thinners, and four adhesives have been identified by a method involving pre-treatment by solvent dilution, filtration, and gas chromatography-mass spectrometry. The non-volatile components in these wet building materials have been determined by infrared spectroscopy. The results have shown the major volatile organic compounds in one-component polyurethane varnish and alkyd paint thinner to be nonane, decane, undecane, xylene, ethylbenzene and ethyltoluene. The main film-forming matter in cement floor paint has been identified as styrenated acrylic emulsion, with the volatile components being mainly butyl acetate, decane and benzene series. The basic substances in these adhesives were polychloroprene, styrene butadiene carboxylated latex, or polyvinyl acetate emulsion. The primary volatile compounds in two adhesives were methyl acetate, and many branched-chain and normal alkanes, while those in the other two adhesives were toluene and benzene.

A gas chromatographic detector based on the quenching of luminescence from a P4/O2 cold flame

1979 ◽  
Vol 57 (10) ◽  
pp. 1238-1243 ◽  
Author(s):  
Walter A. Aue ◽  
Zbigniew M. Mielniczuk
Keyword(s):  
Oxygen Atom ◽  
Gas Phase ◽  
Organic Compounds ◽  
Linear Response ◽  
Phase Reaction ◽  
Quenching Effect ◽  
Gas Phase Reaction ◽  
Cold Flame ◽  
Branched Chain ◽  
Considerable Range

Gas chromatographic effluents were detected by their quenching effect on the luminescence of a steady 'cold flame', as provided by the gas-phase reaction of phosphorus vapor and oxygen. The response of organic compounds correlated with their 'ease of oxidation' in accordance with the literature, suggesting that such compounds act as oxygen atom scavengers in the branched-chain P4/O2 reaction.Most substances showed linear response over one to two orders of magnitude, and minimum detectable amounts ranged from 2 × 10−9g (benzaldehyde) to 2 × 10−4g (dichloromethane). The detector temperature could be varied to (a) alter response ratios, i.e. selectivity, among some types of compounds; and (b) produce easily-obtained Arrhenius plots. However, the response (luminescence quenching) of most compounds was independent of temperature over a considerable range.

Iodinated Organic Compounds As Contrast Media for Radiographic Diagnoses

Radiology ◽  
1947 ◽  
Vol 49 (2) ◽  
pp. 143-151 ◽  
Author(s):  
Glenn E. Jones ◽  
William E. Chalecke ◽  
Joseph Dec ◽  
John A. Schilling ◽  
George H. Ramsey ◽  
...  
Keyword(s):  
Contrast Media ◽  
Organic Compounds

Iodinated Organic Compounds As Contrast Media for Radiographic Diagnoses

Radiology ◽  
1948 ◽  
Vol 51 (2) ◽  
pp. 225-236 ◽  
Author(s):  
Glenn E. Jones ◽  
Alphonsus L. Grohowski ◽  
Harold D. Robertson ◽  
George H. Ramsey ◽  
John A. Schilling ◽  
...  
Keyword(s):  
Contrast Media ◽  
Organic Compounds

scholarly journals Genomic and Transcriptomic Basis ofHanseniaspora vineae's Impact on Flavor Diversity and Wine Quality

2018 ◽  
Vol 85 (1) ◽  
Author(s):  
Facundo Giorello ◽  
Maria Jose Valera ◽  
Valentina Martin ◽  
Andres Parada ◽  
Valentina Salzman ◽  
...  
Keyword(s):  
Phylogenetic Analysis ◽  
Amino Acid ◽  
Alternative Pathway ◽  
Ethyl Esters ◽  
Gene Duplications ◽  
Wine Quality ◽  
Wine Production ◽  
Flavor Compound ◽  
Content Type ◽  
Branched Chain

ABSTRACTHanseniasporais the main genus of the apiculate yeast group that represents approximately 70% of the grape-associated microflora.Hanseniaspora vineaeis emerging as a promising species for quality wine production compared to other non-Saccharomycesspecies. Wines produced byH. vineaewithSaccharomyces cerevisiaeconsistently exhibit more intense fruity flavors and complexity than wines produced byS. cerevisiaealone. In this work, genome sequencing, assembling, and phylogenetic analysis of two strains ofH. vineaeshowed that it is a member of theSaccharomycescomplex and it diverged before the whole-genome duplication (WGD) event from this clade. Specific flavor gene duplications and absences were identified in theH. vineaegenome compared to 14 fully sequenced industrialS. cerevisiaegenomes. The increased formation of 2-phenylethyl acetate and phenylpropanoids such as 2-phenylethyl and benzyl alcohols might be explained by gene duplications ofH. vineaearomatic amino acid aminotransferases (ARO8andARO9) and phenylpyruvate decarboxylases (ARO10). Transcriptome and aroma profiles under fermentation conditions confirmed these genes were highly expressed at the beginning of stationary phase coupled to the production of their related compounds. The extremely high level of acetate esters produced byH. vineaecompared to that byS. cerevisiaeis consistent with the identification of six novel proteins with alcohol acetyltransferase (AATase) domains. The absence of the branched-chain amino acid transaminases (BAT2) and acyl coenzyme A (acyl-CoA)/ethanolO-acyltransferases (EEB1) genes correlates withH. vineae’s reduced production of branched-chain higher alcohols, fatty acids, and ethyl esters, respectively. Our study provides sustenance for understanding and potentially utilizing genes that determine fermentation aromas.IMPORTANCEThe huge diversity of non-Saccharomycesyeasts in grapes is dominated by the apiculate genusHanseniaspora. Two native strains ofHanseniaspora vineaeapplied to winemaking because of their high oenological potential in aroma and fermentation performance were selected to obtain high-quality genomes. Here, we present a phylogenetic analysis and the complete transcriptome and aroma metabolome ofH. vineaeduring three fermentation steps. This species produced significantly richer flavor compound diversity thanSaccharomyces, including benzenoids, phenylpropanoids, and acetate-derived compounds. The identification of six proteins, different fromS. cerevisiaeATF, with diverse acetyltransferase domains inH. vineaeoffers a relevant source of native genetic variants for this enzymatic activity. The discovery of benzenoid synthesis capacity inH. vineaeprovides a new eukaryotic model to dilucidate an alternative pathway to that catalyzed by plants’ phenylalanine lyases.

Mass spectrometry of organic compounds in the group V elements—II: Branched chain aliphatic derivatives

1972 ◽  
Vol 6 (11) ◽  
pp. 1199-1206 ◽  
Author(s):  
R. G. Kostyanovsky ◽  
V. G. Plekhanov ◽  
Yu. I. Elnatanov ◽  
L. M. Zagurskaya ◽  
V. N. Voznesensky
Keyword(s):  
Mass Spectrometry ◽  
Organic Compounds ◽  
Group V ◽  
Branched Chain

Evaluation of Some Iodine-Containing Organic Compounds as X-Ray Contrast Media

1951 ◽  
Vol 78 (1) ◽  
pp. 313-317 ◽  
Author(s):  
D. Neuhaus ◽  
A. A. Christman ◽  
H. B. Lewis
Keyword(s):  
Contrast Media ◽  
Organic Compounds ◽  
X Ray
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