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  • 1
    Electronic Resource
    Electronic Resource
    Static headspace gas chromatography of residual solvents in pharmaceutical products (1994)
    Springer
    Chromatographia 39 (1994), S. 645-648 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Headspace analysis ; Gonadotrophins ; Residual solvents
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A headspace, gas chromatographic method for determining residual solvents in pharmaceutical products such as the gonadotrophin powders, has been developed. The method allows the determination of residual solvents by transferring the samples directly into a vial contianing 10 mL 2M sodium chloride; the analysis is carried out by sampling the headspace and separating by capillary gas chromatography using a programmedtemperature vaporizer (PTV) injector. The procedure described is simple, sensitive and reproducible. The lower limit of detection is 20 ppb for ethyl alcohol, 8 ppb for acetone and 0.5 ppb for diethyl ether.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02274577
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  • 2
    Electronic Resource
    Electronic Resource
    Fast headspace analysis with short microcapillary columns (1995)
    Springer
    Chromatographia 41 (1995), S. 419-423 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Headspace analysis ; Microcapillary columns ; Short columns ; Volatile compounds
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A new method of analysis using headspace gas chromatography with microcapillary columns is proposed. Small diameter (50 μm I.D.) fused-silica capillary columns with non-extractable SE-54 and PS-255 polysiloxane stationary phases were used for the analysis of low boiling organic compounds. The small diameter columns possess the usual very high efficiency so that the method can be employed for the headspace analysis of complex mixtures. The use of short microcolumns reduces the analysis times in comparison to conventional capillary columns. Good performances were obtained in the analysis of volatile compounds in some lemon essential oil, perfumes, and water samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02318616
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  • 3
    Electronic Resource
    Electronic Resource
    Separation of polychlorinated biphenyls from chlorinated pesticides using aminopropyl bonded-phase cartridge and determination by GC-ECD (1998)
    Springer
    Chromatographia 48 (1998), S. 293-298 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Solid phase extraction ; Polychlorobiphenyls ; Clorinated pesticides ; Organochlorine separation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Gas chromatography of polychlorinated biphenyls and chlorinated pesticides in water samples is carried out after adsorption from a 25–500 mL sample, on a cartridge containing 100 mg aminopropyl-bonded porous silica. The clean-up step in which the PCBs and chlorinated pesticides are separated in different eluates is achieved by passing 25 mL of 40% aqueous methanol through the NH2 Sep-Pak cartridge. The PCBs are desorbed with 500 μL ethylacetate, which is concentrated and analysis by GC-ECD. The average recovery, at 1 ppb is 〉97% with a standard deviation 〈2. The limits of detection are 0.1 ng μL−1 and 5 pg μL−1 respectively for Cl3-PCB and Cl8-PCB congeners. In the separation of PCBs from the chlorinated pesticides tested in this work, only the Aldrin is adsorbed for 60% with the PCBs by the NH2 Sep-Pak cartridge. The method described is rapid, simple and reproducible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02467685
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  • 4
    Electronic Resource
    Electronic Resource
    Rapid determination of chlorinated pesticides using CN-bonded cartridges followed by GC-ECD (1993)
    Springer
    Chromatographia 35 (1993), S. 290-294 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Solid phase extraction ; Organochloride pesticides ; Water analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Gas chromatography of chlorinated pesticides in water is carried out after adsorption of a 50 mL sample using a cartridge containing 100 mg CN-bonded porous silica and extraction with 500 μL pentane. The average recovery for eight organochloride pesticides at 1 ppb was 〉95%. The procedure described is simple, selective and reproducible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02277512
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  • 5
    Electronic Resource
    Electronic Resource
    Separation of aliphatic and aromatic amines by thin-layer chromatography using silica gel plates (1980)
    Springer
    Chromatographia 13 (1980), S. 623-625 
    Details
    ISSN: 1612-1112
    Keywords: Aliphatic amines ; Aromatic amines ; TLC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary 28 different aromatic and aliphatic amines have been separated by TLC; 20 solvent systems were examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02302464
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  • 6
    Electronic Resource
    Electronic Resource
    Headspace gas chromatographic analysis for the determination of traces of ethylene oxide in sterilized materials (1989)
    Springer
    Chromatographia 27 (1989), S. 469-471 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Headspace analysis ; Ethylene oxide ; Capillary column
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A headspace gas chromatographic method for determination of traces of ethylene oxide (EO) in sterilized materials has been developed. The method allows the determination of the amount of EO by putting the samples directly into acetonitrile and analysing by means of headspace GC. The procedure described is simple, sensitive, reproducible and linear. The lower limit of detection is 0.015 μg/g of sterilized material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02319567
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  • 7
    Electronic Resource
    Electronic Resource
    Kaolin as support for porous layer open tubular columns (1981)
    Springer
    Chromatographia 14 (1981), S. 285-288 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Porous layer open tubular columns ; Kaolin as support ; Column performance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary PLOT columns have been prepared with kaolin as the liquid phase support. These columns show good efficiency with different stationary phases and good thermal stability with polar phases. The performance of columns is shown by the separation of various mixtures such as fatty acids, phenols and anilines which are of analytical importance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02259267
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  • 8
    Electronic Resource
    Electronic Resource
    Trapping efficiency of aqueous micropollutants sampled and analysed using the same capillary column. Theoretical aspects and experimental results (1993)
    Springer
    Chromatographia 35 (1993), S. 653-660 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Capillary column sampling ; Additivity of variance in GC ; Aqueous samples ; PAHs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The possibility of using capillary columns for both sampling and gas chromatographic analysis of aqueous micropollutants has been studied. Factors influencing gas chromatographic band dispersion of the solute were investigated and a mathematical relationship developed correlating the properties (ID, df) of the capillary columns to the degree of dispersion of adsorbed substances has been derived. The experimental results obtained with aqueous samples are in good agreement with the theoretically forecast data. The method developed allows gas chromatographic dosing of traces of organic substances, reducing inconvenience deriving from excessive sample handling to a minimum. Non-refocusing of the analyte does not, in any significant way, compromise column efficiency for substances that are not very soluble in water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02267932
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  • 9
    Electronic Resource
    Electronic Resource
    Capillary columns in series for the gas chromatographic analysis of essential oils (1987)
    Springer
    Chromatographia 23 (1987), S. 790-795 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Capillary columns in series ; Variable polarity columns ; Essential oils analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary By connecting capillary columns of different polarity in series and by changing the temperature program gradient, a system of variable polarity is obtained. The working conditions can be adjusted to optimize separations of complex mixtures. Application to the analysis of essential oils of: lavender, thyme, lemon petit grain, bergamot, and tangerine, are reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02311401
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  • 10
    Electronic Resource
    Electronic Resource
    Linear trimerization of 1-ethynylcyclohexan-1-ol catalysed by nickel(II) complexes (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 1 (1987), S. 555-563 
    Details
    ISSN: 0268-2605
    Keywords: Trimerization ; 1-ethynylcyclohexan-1-ol linear trimer ; Ni(II) catalysis ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The catalytic reaction of 1-ethynylcyclohexan-1-ol (EC) in the presence of bisphosphine nickel(II) complexes yields a linear trimer. The trimer could be isolated and characterized by means of MS, IR and NMR spectroscopies. The reaction mechanism is also discussed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aoc.590010610
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