Gas chromatographic profiles

Polyalphaolefin Hydraulic Fluids. None of the known components of polyalphaolefin hydraulic fluids are on the TRI. Releases of polyalphaolefin hydraulic fluids in air are probably similar to mineral oil hydraulic fluids. It may be difficult to estimate the release of polyalphaolefin hydraulic fluids to air by identifying occurrences of polyalphaolefin hydrocarbon isomers in air at a particular facility since these constituents also are present in mineral oil and concentrations of the components cannot always be uniquely associated with polyalphaolefin hydraulic fluid release. Nonetheless, the gas chromatographic profile of a polyalphaolefin will be very different than that of a mineral oil, and identification may be possible when polyalphaolefins predominate in a sample. 

Zhou, F. Zhu, H. Tang, G. Gao, S. Study on the discrimination of bacteria by gas chromatographic profiles of cellular fatty acids. Weishengwu Xuebao 1987, 27, 95-104. 

P. Husek, P. Matucha, P. Simek, Smooth Esterification of Di and Tricarboxylic Acids with Methyl and Ethyl Chloroformates in Gas Chromatographic Profiling of Urinary Acidic Metabolites, Chromatographia, 58, 623 630 (2003). 

Aishima used hierarchical cluster analysis on gas chromatographic profiles [10 peaks out of 93 measured peaks, 48 samples seleeted out of 200 samples of eight brands (categories) of soy sauce]. The obtained dendrograms were mainly discussed in connection with the results of linear discriminant analysis and the ten peaks selected for clustering. 

Data Reduction. A gas chromatographic profile of the Tenax-trapped volatiles from a 33.3% bright/33.3% burley/33.3% oriental tobacco sample is shown in Figure 6. The 22 selected peaks are designated. 

Muskiet FAJ, van Doormaal JJ, Martini IA, Wolthers BG, W van der Slik (1983) Capillary gas chromatographic profiling of total long-chain fatty acids and cholesterol in biological materials. J Chromatogr 278 231-244... 

Jansen G, Muskiet FA, Schierbeek H, Berger R, van der Slik SW (1986) Capillary gas chromatographic profiling of urinary, plasma and erythrocyte sugars and polyols as their trimeth-ylsilyl derivatives, preceded by a simple and rapid prepurification method. Clin Chim Acta 157 277-293... 

Shackleton CH, Taylor NF, Honour JW (1980b) An Atlas of Gas Chromatographic Profiles of Neutral Urinary Steroids in Health in Disease. Packard-Becker, Delft... 

Kuroki, H., Haraguchi, K., Masuda, Y. (1984) Synthesis of polychlorinated dibenzofuran isomers and their gas chromatographic profiles. Chemosphere 13(4), 561-573. 

FIGURE 9.10 High-speed gas chromatographic profiles of JP-4, Jet-A, JP-7, JPTS, and JP-5 fuels. (From Lavine, B.K. et al.,Anal. Chem., 67, 3846-3852, 1995. With permission.)... 

Why use MS/MS analysis of volatile components frcm food and flavor components Figure 1 provides the answer. Hie top trace is the capillary column gas chromatographic profile of the concentrated volatiles fran a knockwurst sausage sanple. The tenperature program of 55 C to 180 C at 5° per minute establishes the time scale frcm beginning to end of run as 25 minutes. Coupled to a mass spectrometer for identification, each of the many conpounds can be examined by the mass spectrometer for only a few seconds. 

Figure 3. Headspace FPD/FID gas chromatographic profiles of products of methioninase action on a methionine substrate at 30°C after A) 1 hour, and B) 100 hours of incubation. Temperature programmed 60° to 130°C at 25°C/min Peaks are 1) hydrogen sulfide, 2) methanethiol, and 3) dimethyl disulfide eluted from a packed Carbopack BHT-100 column.

Stanimirova, I. Boucon, C. Walczak, B. (2011). Relating gas chromatographic profiles to sensory measurements describing the end products of the Maillard reaction. Talanta, Vol.83, No 4, (January 2011), pp. 1239-1246, ISSN 0039-9140... 

Zlatkis, A., Lee, K. Y., Poole, C. F., and Holzer, G., 1979, Capillary gas chromatographic profile analysis of volatile compounds in sera of normal and virus-infected patients, J. Chromatog., 163 125-. 

Fig. 3. Typical gas chromatographic profiles obtained after on-fibre derivatization of carbonyl compounds with pentafluorophenylhydrazine (A) from In vitro sampling of Sansivieria trifasciata flowers and (B) from a standard aqueous solution (1,58 mM of each aliphatic aldehyde, C3-C11). (C) Graphical representation of Sansevieria trifasciata flower scent composition change during the day. Principal component analysis of the compositional data permitted to discern a coordinate system with 87% of the information.

The gas chromatographic profiles of the volatile compounds generated from the model reaction systems are shown in Fig. 1. The identification and quantification of the volatile compounds generated from the model systems of IMP and alliin as well as IMP and deoxyalliin are listed in Tables II and III, respectively. As shown in Fig. 1 (C), in the absence of alliin or deoxyalliin, thermal degradation of IMP produced only a few trace components. 

Capillary Column Gas Chromatographic Profile Analysis of Volatile Compounds in Sera of Normal and Infected Patients... 

Gas Chromatographic Profiles of Urinary Acidic and Alcoholic Catecholamine Metabolites Clin. Chem. (Winston-Salem, N. C.)... 

Gas Chromatographic Profile of Total Neutral Steroids in Normal Human Urine. Determination of 18 Steroid Hormones... 

Kuksis A, Myher J J, Marai L, Little J A, McArthur R G, Roncari DAK 1986 Usefulness of gas chromatographic profiles of plasma total lipids in diagnosis of phytosterolemia. J Chrom 381 1-12... 

Limitations. Irrespective of the statistical method selected, the goal must be to determine which peaks in the gas chromatographic profile are the best indicators of sensory quality. This peak selection together with a mathematical model are used to analytically monitor (or predict) sensory quality. Assuming that the analytical method is both accurate and precise, an instrumental method such as this can very effectively predict sensory quality. In a quality control laboratory, this analytical approach can serve as an untiring evaluator. 

Some studies have found that creosote-treated timber can be a source of PAHs to marine organisms. Tissue of mussels Mytilus edulis) around creosote-treated piers contained elevated concentrations of benzo[a]pyrene, which declined with distance from the pilings (Dunn and Stich 1976b). The authors examined the gas chromatographic profiles of PAHs in mussels and nearby creosote-treated wood and found remarkably similar patterns in the chromatograms, indicating that the creosote-treated wood was probably the source in mussels. Dunn and Fee (1979) found that commercial lobsters Homarus americanus) accumulated PAHs when kept in an impoundment area that was constructed with creosote-coated timbers. After 3 mon, the tail muscle of the animals in the pound facility contained from 3 times more phenanthrene to 482 times more benzo[k]fluoranthene than in control lobsters. Most of the HPAHs were 100-300 times more abundant in the impounded animals compared to control animals. 

Muskiet, F.A.J., Fremouw-Ottevangers, D.C., Wolthers, B.G. and de Vries, J.A. (1977) Gas-chromatographic profiling of urinary acidic and alcoholic catecholamine metabolites. Clin. Chem., 23,863. 

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