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  • 1
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: After decaffeination of green coffee beans by extraction with [14C]-trichloroethylene, the beans were radioactive and did not loose their activity during roasting. On the basis of the radioactivity uptake, it is estimated that during commercial decaffeination 0.25 to 1 g of trichloroethylene is incorporated per kg of beans. The nature of the compound or compounds formed on interaction of trichloroethylene with coffee constituents is still unknown, but attention is directed to the possibility of the formation of highly toxic S-dichlorovinyl derivatives as is the case in the extraction of soya beans with trichloroethylene.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 50 (1967), S. 958-962 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Amphetamine (I) reacts spontaneously at room temperature with carbon disulfide to form (1-phenyl-isopropyl)-isothiocyanate, which was identified by UV.-, IR.- and mass spectrometry. This reaction is used for the analytical determination of I by gas chromatography. The characteristic peak shift which occurs after addition of carbon disulfide differentiates I from N-methylamphetamine (II). The method is applied to urine analysis of I and II (which partially metabolizes to I) and might be useful in doping control.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 50 (1967), S. 1409-1415 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A flameless atomic absorption method for the determination of small amounts of mercury in solutions is described. The mercury is amalgamated quantitatively on a copper wire and subsequently vaporized in an absorption cell which is placed in the light path of a commercial atomic absorption instrument. The mercury vapor can be quantitatively determined by its absorption of the 253.7 nm mercury line. The method has a detection limit of 0.2 ng and is therefore about 10000 times more sensitive than atomic absorption analysis using flame atomization.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 38 (1955), S. 1396-1398 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The poisoning effect of hydroxy-s-triazines on Pt-catalyst was observed using the system PtO2, triazine-derivative, 3,4,5-trimethoxy-cinnamic acid and H2 in alcohol. The dihydroxy-s-triazines I and II resulting from alkaline oxidation of uric acid, their dihydro-derivatives III and IV, and trihydroxy-s-triazine cyanuric acid (VI) inhibit the hydrogenation as has previously been found for the unsubstituted s-triazine V.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Diethyl ether is introduced as solvent for the analysis of gallium, indium and thallium by flame emission. Its use improves the analytical sensitivity and the detection limits of the method. Since diethyl ether is the solvent of choice for the extraction of the three metals from aqueous solutions, the possibility of spraying such extracts into the flame simplifies detection and assay. A procedure for the analysis of thallium in biological samples is given and illustrated by figures for its distribution in a man poisoned by a fatal dose of thallium sulphate.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 34 (1951), S. 82-98 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wurden verschiedene (stereoisomere) α,α′-Imino-propionsäureglutarsäuren, α,α′-Imino glutarsäuren,-bernsteinsäuren und α,α′-Imino glutarsäuren,-bernsteinsäuren hergestellt und ihr Verhalten zu Fermenten, die sich in Leber und Nieren finden, untersucht. Während sich in Nieren- und Leberhomogenaten und in Extrakten aus Aceton-Trockenpulver der genannten Organe keine Fermente nachweisen liessen, welche α,α′-Imino-dipropionsäuren, α,α′-Imino-propionsäureisocapronsäure, Octopin und α,α′-Imino-bernsteinsäure-propionsäuren dehydrieren, wurden α,α′-Imino-propionsäure-glutarsäuren (II) und α,α′-Imino-glutarsäure-bernsteinsäuren (III) bei Gegenwart der genannten Fermentsysteme durch Sauerstoff rasch dehydriert. Es scheint demnach, dass zur Angreifbarkeit solcher Imino-dicarbonsäuren durch Dehydrasen Glutaminsäure am Aufbau der Iminodicarbonsäure teilhaben muss. Als Folge der Hydrolyse der durch die Hydrierung gebildeten Schiff'schen Basen und nachfolgenden Desaminierung der gebildeten Aminosäuren wird Ammoniak freigesetzt, dessen Menge dem Sauerstoffverbrauch, d. h. der Dehydrierung parallel geht.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 36 (1953), S. 549-554 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: α,α′-Imino-glutaric-succ,inic acid is not decomposed by a highly purified preparation of glutamic-oxalacetic transaminase; „α,α'-iminoacid dehydrases“ must be different from transaminases.
    Type of Medium: Electronic Resource
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