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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 27 (1979), S. 194-195 
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 27 (1979), S. 1177-1181 
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    European food research and technology 159 (1975), S. 285-286 
    ISSN: 1438-2385
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Description / Table of Contents: Summary The relationship between the malonaldehyde formed as oxidation product of lipids, and changes of proteins in frozen Baltic herring (Clupea harengus var.membranes) was studied. Changes occurred in the muscle proteins due to freezing, so that water-binding capacity, solubility, and the amount of free s-amino groups in these proteins decreased. A close relationship was found between the amount of malonaldehyde and changes of proteins in the different phases of storage. The reaction of malonaldehyde with the free amino groups of the proteins may be one of the factors on which the changes of proteins during frozen storage are based.[/p]
    Notes: Zusammenfassung Das Verhältnis zwischen Malonaldehyd, welches als Oxydationsprodukt von Fetten entsteht, und Veränderungen von Proteinen in gefrorenem Ostseehering (Clupea harengus var.membranes) wurde untersucht. Veränderungen in den Muskelproteinen wurden durch Gefrieren verursacht, so daß Wasserbindungsvermögen, Löslichkeit und Menge von freien ɛ-Aminogruppen vermindert wurden. Ein enger Zusammenhang herrschte zwischen der Menge von Malonaldehyd und Veränderungen von Proteinen zu verschiedenen Lagerungszeiten. Die Reaktion von Malonaldehyd mit den freien Aminogruppen der Proteine mag einer der Faktoren sein, auf welche die Veränderungen von Proteinen während der Lagerung in gefrorenem Zustand beruhen.[/p]
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    European food research and technology 166 (1978), S. 19-22 
    ISSN: 1438-2385
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Description / Table of Contents: Summary Golden beet (Beta vulgaris var. lutea) color was found to contain 8 components, of which the most important seemed to be vulgaxanthin-I and -II. Purified vulgaxanthin-I solutions are easily degraded at high temperatures. The stability is, however, strongly dependent on pH: the stability is best at pH values between 5 and 6, and poorest at low pH values, but at pH 7 the stability is better than that of betanin. Vulgaxanthin-I is more stable in the raw extract than in a purified solution. EDTA, even in ppm amounts, was found to improve the stability of betanin. The effect was dependent on pH value, being most efficient at pH 2.0 and 5.0. Stability of vulgaxanthin-I was not improved by EDTA. Tannin did not show stabilizing influence. Ascorbic acid was found to have an unfavorable influence on stability, especially in the case of betanin.
    Notes: Zusammenfassung Die Farbe der gelben Variante der roten Beete (Beta vulgaris var. lutea) enthielt 8 Komponenten, davon die wichtigsten Vulgaxanthin-I und -II. Gereinigte Lösungen von Vulgaxanthin-I werden bei hohen Temperaturen leicht zersetzt. Die Haltbarkeit ist jedoch in hohem Grade von pH-Wert abhängig und am besten zwischen pH 5 und 6, am schlechtesten bei niedrigem pH. Jedoch ist die Haltbarkeit von Vulgaxanthin-I bei pH 7 besser als die von Betanin. Vulgaxanthin-I ist besser haltbar im Rohextrakt als in gereinigter Lösung. Es wurde gefunden, daß EDTA schon in Mengen von ppm die Haltbarkeit von Betanin verbessert. Der Einfluß war pH-abhängig und am besten zwischen pH 2,0 und 5,0. Bei Vulgaxanthin-I wurde die Haltbarkeit nicht durch EDTA verbessert. Tannin hatte keine stabilisierende Wirkung, die Ascorbinsäure beeinflußte die Haltbarkeit nachteilig, besonders die von Betanin.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    European food research and technology 167 (1978), S. 250-251 
    ISSN: 1438-2385
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Description / Table of Contents: Summary The stability of vulgaxanthin I at 100 °C is dependant on the water activity of the system. The half-life of vulgaxanthin I was found to be three times greater ata 1 0.20 than at 1.00. The rate constants for vulgaxanthin I degradation varied exponentially with respect to water activity and belowa w=0.50 the stability was not improved.
    Notes: Zusammenfassung Die Stabilität von Vulgaxanthin I hängt von der Aktivität des Wassers im System ab. Die Halbwertszeit von Vulgaxanthin I war beia w = 0,20 dreimal so groß wie beia w = 1,00. Die Verteilungskoeffizienten für die Zersetzung von Vulgaxanthin I in Abhängigkeit von der Wasseraktivität zeigen einen exponentiellen Zusammenhang, so daß die Stabilität bei Werten füra w kleiner 0,50 nicht mehr zunahm.
    Type of Medium: Electronic Resource
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