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  • 1
    Electronic Resource
    Electronic Resource
    ROLE OF NITRITE IN CURED MEAT FLAVOR: CHEMICAL ANALYSIS (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 45 (1980), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Hams treated with 2.5% salt and varying concentrations of sodium nitrite, butylated hydroxytoluene (BHT), and citric acid were evaluated by means of thiobarbituric acid (TBA) values, formation of fluorescent products, hexanal and 2,4-decadienal, and sensory analyses. Results demonstrate that nitrite significantly reduces (p 〈 0.05) lipid oxidation in pork stored aerobically at 4°C. Meat treated with 0.02% BHT or 1000 mg/kg of citric acid also reduced TBA values, although these compounds were not as effective as 50 mg/kg of sodium nitrite. A significant relationship (p 〈 0.05) was established between off-odor/flavor formation and both TBA values and the production of fluorescent products during the first 7 days of storage. However, the relationship between fluorescent products and off-odors/flavors was not significant at 14 days. Significantly lower (p 〈 0.05) levels of hexanal and 2,4-decadienal were found in meat treated with nitrite, BHT or citric acid compared to samples containing only salt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1980.tb07472.x
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  • 2
    Electronic Resource
    Electronic Resource
    Comparison of Volatiles Produced by Selected Pseudomonads on Chicken Skin (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 48 (1983), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Four pseudomonad cultures (one P. putida, one nonpigmented, and two P. fluorescens) were isolated from spoiled chicken breasts held at 2–6°C for 14 days. Each culture was grown on psychrotroph-free chicken skin for 14 days at 2–6°C. The volatiles produced by each organism were separated by high-resolution gas chromatography and identified by mass spectrometry. Some of the more significant volatile spoilage compounds produced by these microorganisms were sulfur-containing, e.g. methanethiol, dimethyl sulfide, propylene sulfide, and dimethyl disulfide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1983.tb09233.x
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  • 3
    Electronic Resource
    Electronic Resource
    Trace element analysis of maternal scalp hair by external beam proton-induced X-ray emission (PIXE) (1984)
    Springer
    Journal of radioanalytical and nuclear chemistry 82 (1984), S. 329-339 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract We have constructed an external beam proton-induced X-ray emission (PIXE) system for trace element analysis of biological and environmental samples. Optimization of sample preparation and experimental PIXE set up has produced a rapid, accurate, sensitive, and reliable PIXE analysis procedure. The analytical procedure was evaluated using maternal scalp hair from pregnant women 16–19 weeks' gestation. The samples were irradiated with 3.5 MeV protons from the Rutgers Nuclear Physics Department's 8 MV Tandem FN Van de Graaff accelerator. The concentrations of the elements calcium (Ca) to cadmium (Cd) in hair are reported for 50 subjects. The analytical procedure is suitable for non-invasive clinical analysis for evaluation of nutritional states and for environmental exposure to toxic metals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02037055
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  • 4
    Electronic Resource
    Electronic Resource
    Factors affecting the retention of polycyclic aromatic hydrocarbons in gas chromatography (1981)
    Springer
    Chromatographia 14 (1981), S. 69-72 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Polynuclear aromatic hydrocarbons ; Retention index ; Vapour pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The retention index of a planar polynuclear aromatic hydrocarbon on the GC phases OV-101, SE-52, and OV-17 is strictly related only to the boiling point, and less closely to the relative molecular mass. The very approximates relation with connectivity index ins only a consequence of the latter. On a nematic lqiuid crystal phase, a variation of activity coefficient, expressed in terms of a shape factor, also influences the retention of PAH.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02279514
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  • 5
    Electronic Resource
    Electronic Resource
    CRC handbook of chromatography carbohydrates volume 1 (1982)
    Springer
    Chromatographia 15 (1982), S. 378-378 
    Details
    ISSN: 1612-1112
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02259224
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  • 6
    Electronic Resource
    Electronic Resource
    Nonextractable cyanopropyl polysiloxane stationary phases for capillary chromatography (1983)
    Springer
    Chromatographia 17 (1983), S. 570-573 
    Details
    ISSN: 1612-1112
    Keywords: Cyanopropyl polysiloxane ; Stationary phase ; Capillary chromatography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Crosslinkable cyanopropylpolysiloxane stationary phases have been difficult to produce because of steric effects of the large cyanopropyl groups or because of the interaction between the polar cyanopropyl groups and the groups added for crosslinking. Various polymers containing 50% to 90% cyanopropyl were synthesized which contained vinyl,p-tolyl, or 4-vinylphenyl groups for crosslinking. Thep-tolyl group was found to give satisfactory crosslinking if there were two such groups attached to one silicon atom.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02261921
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  • 7
    Electronic Resource
    Electronic Resource
    The preparation of non-extractable methylphenylpolysiloxane stationary phases for capillary column gas chromatography (1982)
    Springer
    Chromatographia 15 (1982), S. 335-340 
    Details
    ISSN: 1612-1112
    Keywords: Capillary gas chromatography ; Fused silica capillary columns ; Crosslinked phenyl polysiloxanes ; Non-extractable stationary phases
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The synthesis of methylphenylpolysiloxane polymers and their use in the preparation of crosslinked, non-extractable stationary phases for fused-silica capillary columns are described. By preparing more viscous phenyl-containing polymers than are commercially available, stationary phase films of these polymers could be efficiently coated on fused-silica capillary columns and stabilized by a free radical crosslinking mechanism using peroxides. Four methylphenylpolysiloxane polymers containing different phenyl concentrations were prepared. These included three polymers containing 50% phenyl and one polymer containing 70% phenyl. Two of the 50% phenyl polymers had one phenyl and one methyl group attached to each silicon atom. One of these also had 1% vinyl incorporated. The third 50% phenyl polymer was synthesized in such a way that one half of the silicon atoms had two phenyl groups attached while the rest contained dimethyl groups. The 70% phenyl polymer also had 4% vinyl incorporated. Due to the intrinsic thermal stability of these phenyl phases and the enhanced film stability achieved by crosslinking, the 70% phenyl phase could be utilized up to 400 °C. Using the methods described in this paper, highly efficient and thermally stable fused silica capillary columns coated with crosslinked methylphenylpolysiloxane stationary phases can be successfully prepared.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02259213
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  • 8
    Electronic Resource
    Electronic Resource
    Static coating of capillary columns using mixed solvents (1983)
    Springer
    Chromatographia 17 (1983), S. 451-453 
    Details
    ISSN: 1612-1112
    Keywords: Static coating ; Mixed solvents ; Capillary gas chromatography ; Capillary supercritical fluid chromatography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Mixed solvents in coating solutions were employed to facilitate (lower temperatures and shorter times) the static coating of capillary columns. Different volume ratios of mixed solvents used in the coating solutions do not affect the quality of capillary columns coated with stationary phases of different polarity. Small diameter (〈100 μm i.d.) capillaries of up to 50 m long were successfully coated with a methylphenylpolysiloxane (50% phenyl) for use in supercritical-fluid chromatography. In addition, an 80 m×0.31 mm i.d. capillary was statically coated with Superox 20 M (0.25 μm film thickness) in a 1∶1n-pentane/methylene chloride mixture at 55 °C. The coating time was only 7 hrs, and the resultant column exhibited a total of 170,000 theoretical plates (k′=5.5).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02262929
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  • 9
    Electronic Resource
    Electronic Resource
    Deactivation of fused silica capillary columns with polymethylhydrosiloxanes (1984)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 329-332 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Fused silica capillary columns ; Deactivation ; Polymethylhydrosiloxanes ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240070608
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of viscosity on stationary phase stability in capillary column gas chromatography (1982)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 5 (1982), S. 413-416 
    Details
    ISSN: 0935-6304
    Keywords: Capillary gas chromatography ; Stationary phase stability ; Stationary phase viscosity ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: With recent advances in column technology it is now possible to prepare highly efficient, very inert, and thermally stable capillary columns coated with nonpolar polysiloxane stationary phases. Unfortunately, the same degree of success has not been achieved for some of the more polar polysiloxane phases. A parameter that has been studied little in the past in relation to stationary phase film stability is the viscosity of the stationary phase. In this paper the efficiency and stability of coated columns are correlated to the viscosity of the phase. Due to their structure, the viscosity of the phenyl-containing polysiloxanes change rapidly with temperature and hence, thin-film coatings are not stable at elevated temperatures. By using high viscosity phenyl-containing methylphenylpolysiloxanes which were recently synthesized, efficient and stable columns have been prepared.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240050804
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