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  • 1
    ISSN: 0935-6304
    Keywords: Thin-layer chromatography, HPTLC ; Anti-circular development ; On-plate derivatization ; Visible scanning ; Quantitation ; Tryptamides/serotonin ; 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
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  • 2
    ISSN: 0935-6304
    Keywords: Thin layer chromatography, HPTLC ; Anticircular mode ; Cosmetic emulsions ; Jojoba wax ester quantitation ; Triglyceride quantitation ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Cosmetic creams were analyzed for their content of jojoba wax and shea fat using anticircular HPTLC, a fast, precise, and reliable method. After optimization of the solvent system (petrol ether/diethyl ether) for the separation of jojoba wax and shea fat, the spots were visualized with phosphomolybdic acid by the “dip-in” technique, subsequently heated, and finally recorded by scanning with a densitometer at 546 nm. Results showed that one particular concentration range gives an optimum correlation between calibration curves and sample evaluations.
    Additional Material: 4 Ill.
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  • 3
    ISSN: 0935-6304
    Keywords: High performance planar chromatography, HPPLC ; Preparative anticircular chromatography (PACH) ; Sample collection ; Quantification ; Silica Gel (20 × 20 and 10 × 10 cm) plates ; RP-18 (20 × 20 and 10 × 10 cm) plates ; Unsaponifiables from plant lipids ; Fatty acid methyl esters ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A preparative anticircular chromatography (PACH) device was constructed to elucidate different applications of separation problems as well as to compare different sample collection techniques in this particular PLC mode. An anticircular PC apparatus had to be established which allowed the utilization of 20 X 20 cm thin-layer plates as well as sampling positioning at any given radius. Typical solvent migration times were 8-12 minutes and ca. 8-10 ml of solvent was needed for an entire 20 cm plate. It was shown that peak broadening effects due to diffusion during long migration could be avoided in the same way as for analytical anticircular PLC on 10 X 10 plates. On the other hand, longer migration distances allow increased resolution, in turn allowing higher sample loads, particularly in the case of trace compound enrichment. A full description of the apparatus is given, including the sampling device.Different sample collection techniques were tried and evaluated, including the through-flow technique by on-line center collection for plate washing as well as classical scraping-off of interesting zones. Further evaluation of the method included quantification and evaluation of consistency by UV/VIS scanning after spot-visualization. Several application examples are given to illustrate the efficiency of the preparative anticircular PLC-system.
    Additional Material: 12 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    ISSN: 0365-9496
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1995 (1995), S. 217-222 
    ISSN: 0947-3440
    Keywords: Amino acids, α-branched ; Highly hindered amides ; Hydrolysis of amino acid amides ; Anchimeric effect ; Phenylalanine, 2-ethyl-, 2-i-propyl- and 2-cyclohexylmethyl- ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Enantiopure 5,5-disubstituted t-butyl 2-t-butyl-3-methyl-4-oxoimidazolidine-1-carboxylates readily available by diastereoselective double alkylation of the parent compound (Boc-BMI) can be converted to α-branched α-amino acids with two bulky substituents (PhCH2/Et, PhCH2/i-Pr, PhCH2/CH2C6H11) in four simple steps: hydrolysis to the amino acid amides, N-benzoylation, cleavage of the amino acid amide group, and debenzoylation (Scheme 3, products 6-10, overall yields 〉50%). This procedure constitutes an extension of the scope of amino acid synthesis from (R)- and (S)-Boc-BMI.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 211 (1882), S. 234-248 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 7
    ISSN: 0173-0835
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: The first topic to be treated in this paper is the nonradioactive DNA fingerprinting by means of in-gel hybridization with digoxigenated (CAC)5. Besides the fact that timeconsuming Southern blotting can be avoided, the dried agarose is an excellent matrix to produce background-free nonradioactive DNA fingerprints. There is no tendency of either the oligonucleotide probe or the antibody towards unspecific binding to the dried agarose. Prehybridization and blocking steps are therefore superfluous. Furthermore, we will discuss what effect the degree of crosslinking of the antibodyenzyme conjugates has. The second topic concerns the isolation and characterization of locus-specific probes from a human (CAC)5 fingerprint. The isolation and characterization of one variable probe, by screening complete genomic libraries, is described and discussed. This probe is compared to a hypervariable single-copy probe, isolated from a size-enriched genomic library. The sequence of the repeat flanking locus-specific probe is presented and a semi-specific, adaptor-mediated polymerase chain reaction was designed to amplify (CAC)n/(GTG)n flanking sequences.
    Additional Material: 5 Ill.
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  • 8
    ISSN: 0173-0835
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Mouse DNA fingerprints were obtained by HaeIII digestion of genomic DNA and ingel hybridization with the (GATA)4 oligonucleotide probe. In order to obtain locusspecific probes that hybridize with only one fragment of the (GATA)4 DNA fingerprint, a genomic library of size-selected inserts was constructed using a system of direct subcloning from the phage clones. During the cloning procedure, the phage as well as the plasmid insert DNAs changed primarily within their repetitive DNA but also within adjacent nonrepetitive sequences, as was demonstrated for several clones by in-gel hybridization with the (GATA)4 probe as well as by sequence analysis. Isolated subclones varied within their (GATA)n repeats, resulting in different insert lengths. Several “metastable” as well as stable (GATA)4-positive subclones could be isolated. Also, vector sequences were affected by alterations during the cloning process. These phenomena are discussed within the context of possible mechanisms for cloning artifacts.
    Additional Material: 5 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    ISSN: 0365-9496
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 10
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Plant/Operations Progress 7 (1988), S. 127-135 
    ISSN: 0278-4513
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The modeling of evaporation and dispersion from chemical spills has been an active area. The available models span the range of very simple calculational methods, for quick response at the time of accidents, to more complex transient models that predict the results of hypothesized events. Conservative assumptions are often used in all of these models in place of more accurate and more complicated computational techniques.
    Additional Material: 8 Ill.
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