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  • Springer  (3)
  • 1970-1974  (2)
  • 1965-1969  (1)
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  • Springer  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Plant foods for human nutrition 16 (1968), S. 162-175 
    ISSN: 1573-9104
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Summary The autoxidative rancidity of food fats which brings deep alterations to their gustatory qualities leads to the formation of small quantities of complex mixtures composed essentially of volatile carbonyl derivatives and low molecular weight acids. In studying the products of oxidation of oleic acid the authors have identified the first as their di-nitrophenyl hydrazones, and the seconds as their hydroxamic derivatives, by means of various thinlayer chromatographic techniques. The obtained results have enabled the authors to confirm an hypothesis recently voiced by them concerning the mechanism of autoxidative alteration of fatty chains as well as concerning the nature of the various impurities that may be formed.
    Abstract: Zusammenfassung Das autoxydierende Ranzigwerden der Nahrungsmittelfette, das ihre geschmacklichen Qualitäten weitgehend mindert, führt zur Bildung kleiner Mengen komplexer Gemische, die im wesentlichen aus flüchtigen Carbonyl-Abkömmlingen und niedermolekularen Säuren bestehen. Bei der Untersuchung der Oxydationsprodukte der Ölsäure stellten die Autoren die ersten in Form ihrer Di-nitrophenyl-hydrazone, die letzteren in Form ihrer Hydroxamate mittels verschiedener DC-Techniken fest. Die Ergebnisse bestätigten eine kürzlich von den Autoren entwickelte Hypothese betreffend den Mechanismus des Abbaues der Fett-Ketten durch Autoxydation und die Natur der verschiedenen sich bildenden Verunreinigungen.
    Notes: Résumé Le rancissement autoxydatif des corps gras alimentaires qui altère profondément leurs qualités gustatives, conduit à la formation de petites quantités de mélanges complexes constitués essentiellement de dérivés carbonylés volatiles et d'acides à bas poids moléculaire. En étudiant les produits d'oxydation de l'acide oléique, les auteurs ont identifié les premiers sous forme de leurs di-nitro-phényl-hydrazones et les seconds sous forme de leurs dérivés hydroxamiques par diverses techniques de chromatographie sur couche mince. Les résultats obtenus ont permis de confirmer une hypothèse précédemment émise par les auteurs sur le mécanisme de l'altération des chaines grasses par autoxydation, ainsi que sur la nature de diverses impuretés susceptibles de se former.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Mutants of E. coli specifically deficient for the enzyme altronic hydrolyase have been isolated. These strains are unable to metabolize galacturonate but still normally grow on glucuronate; inducibility for the other galacturonate-induced enzymes is not modified. The position of these mutations called “uxaA” locus in relation to the argG, tolC and metC markers was established both by sexual crosses and by P1 transduction; evidence is presented that uxaA is located between argG and tolC. Biochemical characterization of uxaA mutants using thermosensible revertants or mutants was achieved by means of thermal inactivation and kinetic parameters determination. Experimental results strongly suggest that uxaA locus is the structural gene of the altronic hydrolyase enzyme.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Mutants of E. coli specifically deficient for the enzyme mannonic hydrolyase have been isolated. These strains are unable to metabolize glucuronate but still normally grow on galacturonate; inducibility for the other glucuronate-induced enzymes is not modified. The position of these mutations called “uxuA” locus in relation to the pyrB-guaC region, and probably near 85.5 minutes, was established by sexual crosses and by P1 transduction Biochemical characterization of uxuA mutants using thermosensible mutants was achieved by means of thermal inactivation and kinetic studies. Experimental results strongly suggest that uxuA locus is the structural gene of the mannonic hydrolyase.
    Type of Medium: Electronic Resource
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