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  • 1
    Electronic Resource
    Electronic Resource
    Identification of pesticide residues in real matrices by combining retention indices and specific multidetection responses (1996)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 19 (1996), S. 80-84 
    Details
    ISSN: 0935-6304
    Keywords: Capillary GC ; Specific detectors ; ECD/FPD response ratios ; Retention indices ; Identification on real samples ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A previous paper reported the possibility of using the ratio between the responses of two different specific detectors to a single compound (detector response ratio, DRR) as an identification criterion for that compound, in combination with its retention index.This article gives some applications of DRR in the identification of some pesticides in four different fruits (apples, apricots, strawberries, and peaches) in a range varying from 0.02 to 1.3 ppm, by means of their ECD/FPD DRRs. After clean-up GC analyses were performed on a single column with dual parallel detection; a personal computer system was used for data analysis.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240190204
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Cyclodextrin derivatives in GC separation of racemic mixtures of volatiles - part XII: Thick-film wide-bore columns for enantiomer GC preparation (1997)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 20 (1997), S. 493-498 
    Details
    ISSN: 0935-6304
    Keywords: Cyclodextrin derivatives ; Enantiomer micropreparative GC ; Thick-film wide-bore columns ; Column loading capacity ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Preliminary results on thick-film wide-bore (0.53mm i.d.) columns for GC preparation of pure enantiomers are described. In particular the loading capacity for several racemates of a 3μm, 30% 2,6-di-O-methyl-3-O-Pentyl-β-CD/OV1701 column and of a 2 μm, 30% 2,3-di-O-acetyl-6-O-dimethyl-t-butylyl-β-CD/PS-086 collumn were determined. Consideration is also given to the relation-ship between resolution values of two enantiomers on anayltical columns and their loading capacity and scaling-up to the corresponding micropreparative columns.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240200906
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Cyclodextrin derivatives for GC separation of racemic mixtures of volatile compounds. Part VIII: 2,6-di-O-methyl-3-O-pentyl-γ-cyclodextrin and 2,6-di-O-methyl-3-O-(4-oxo-pentyl)- and 2,6-di-O-pentyl-3-O-(4-oxo-pentyl)-β-and -γ-cyclodextrins (1995)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 18 (1995), S. 295-298 
    Details
    ISSN: 0935-6304
    Keywords: Capillary GC ; Enantiomer separation ; Differently derivatized cyclodextrins ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In pre vious papers, 2,6-di-O-methyl-3-O-pentyl-β-cyclodextrin (CD) was demonstrated to be successful in separating volatile compounds, while avoiding the drawbacks of 2,3,6-tri-O-methyl-O-methyl-β-CD in terms of column stability and operating temperature.Since a CD chiral selector of universal use has not yet been found, and at least two (or more) columns coated with different CD derivatives are therefore necessary for routine work, the performance of 2,6-di-O-methyl-3-O-pentyl-γ-CD, 2,6-di-O-methyl-3-O-(4-oxopentyl)-γ-CD, 2,6-di-O-pentyl-3-O-(4-oxo-pentyl)-β-CD, and 2,6-di-O-pentyl-3-O-(-4-oxo-pentyl)-γ-CD diluted in polysiloxanes for the separation of volatile compounds in aromas and essential oils will be illustrated; each column coated with each of the newly synthesized CD derivatives was evaluated by analyzing more than 150 different recemates with different structures.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240180506
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    HPLC - UV determination of pesticide residues at 0.01 ppm in apple and pear pulp used for baby food (1996)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 19 (1996), S. 105-110 
    Details
    ISSN: 0935-6304
    Keywords: HPLC-UV ; Baby food ; Apple pulp ; Pear pulp ; Diflubenzuron ; Ethiofencarb ; Teflubenzuron ; Triflumuron ; Triforine ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Two distinct methods are described for determination of residues of ethiofencarb and triforine, and of diflubenzuron, teflubenzuron, and triflumuron at the 0.01 ppm level in apple and pear pulp used for baby food;recoveries are above 50%. Diflubenzuron, teflubenzuron, and triflumuron are extracted with a 1:1 mixture of dichloromethane and acetone, and the extracts are cleaned by SPE using C18 as stationary phase and methanol as mobile phase. Ethiofencarb and triforine are extracted with dichloromethane, and the extracts cleaned using the same stationary phase but a 1:1 mixture of acetonitrile and water as mobile phase. Analysis of both groups of pesticides is by isocratic HPLC - UV at 210 nm using an RP-18 column and acetonitrile-water as mobile phase.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240190209
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Cyclodextrin Derivatives in GC Separation of Racemic Mixtures of Volatiles. Part XIV: Some Applications of Thick-Film Wide-Bore Columns to Enantiomer GC Micropreparation (1998)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 21 (1998), S. 103-106 
    Details
    ISSN: 0935-6304
    Keywords: cyclodextrin derivatives ; enantiomer micropreparative GC ; thick-film wide-bore columns ; high-purity enantiomer isolation ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---Representative examples of preparative GC isolation of pure enantiomers in amounts ranging from 0.5 to 2 mg, with thick-film wide-bore open tubular columns coated with cyclodextrin (CD) diluted in polysiloxanes, are described. Two 25 m×0.53 mm i.d. columns, coated with 3 μm of 30% 2,6-di-O-methyl-3-O-pentyl-β-CD/OV-1701 and 2 μm of 30% 2,3-di-O-acetyl-6-O-tert- butyldimethylsilyl-β-CD/PS-086 as stationary phases, were used. Methyl 3-hydroxyhexanoate, methyl 2-methylbutanoate, δ-hexalactone, δ-octalactone, and γ-decalactone (the latter from a nature-identical mango aroma), were submitted to automated micropreparative GC. Average yields of about 30% were achieved when amounts above 20 μg/μl were injected, and an enantiomeric purity above 90% was obtained.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
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