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  • Kováts retention indices  (1)
  • Lycopersicon esculentum  (1)
  • 1
    Electronic Resource
    Electronic Resource
    The level of trigonelline and other quaternary ammonium compounds in tomato leaves in ratio to the changing nitrogen supply (1988)
    Springer
    Plant and soil 109 (1988), S. 285-287 
    Details
    ISSN: 1573-5036
    Keywords: choline ; Fusarium oxysporum ; Lycopersicon esculentum ; nitrogen supply ; OPLC ; Solanaceae ; tomato ; trigonelline ; Nε-trimethyl-L-lysine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The choline, trigonelline, Nε-trimethyl-L-lysine content in the leaf tissue of tomato plants grown with varying amounts of nitrate nitrogen was determined by the OPLC method. The choline and trigonelline level in tomato leaves increased in direct ratio to the nitrogen supply. The possible role of these compounds in the physiology and in the augmented resistance of plants to nectrotizing stresses is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02202097
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  • 2
    Electronic Resource
    Electronic Resource
    Structure-retention relationships in the gas chromatography of N,N-dialkylhydrazones (1996)
    Springer
    Chromatographia 42 (1996), S. 653-659 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Dialkylhydrazones ; Kováts retention indices ; Structure-retention relationships
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary N,N-Dialkylhydrazones [DAHs; R1R2C=1N-2N(R3)2] were prepared and their Kováts retention indices determined on 100% dimethylpolysiloxane (HP-1) and 5% diphenyl and 95% dimethylpolysiloxane (HP-5) stationary phases. The physico-chemical and retention behaviour of the DAHs depend greatly on whether R2=H or an alkyl group. A similar difference is observed in the alkane and oxo homomorphic factors of DAHs formed from aldehydes or ketones. The difference is explained on the basis of NMR and quantum-chemical results by intramolecular interactions between R2 and the lone pair of the2N atom. A single linear equation is suitable for prediction of retention indices if parameters are introduced representing resonance structure (bond angle and electron density) besidesI oxo or the van der Waals' surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02267697
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    Paper (German National Licenses)
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