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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 21 (1973), S. 670-673 
    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 24 (1976), S. 200-201 
    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
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 27 (1979), S. 195-197 
    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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  • 4
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 22 (1974), S. 709-709 
    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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  • 5
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 25 (1977), S. 438-438 
    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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  • 6
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 28 (1980), S. 1340-1342 
    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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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    European food research and technology 181 (1985), S. 221-222 
    ISSN: 1438-2385
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Description / Table of Contents: Summary At successive intervals, we removed representative samples of 30–50 apples from a batch of about 180 kg of Golden Delicious apples being under a controlled atmosphere at 3–4°C. We constructed simple equipment so that acetone powders could be prepared from these large samples for subsequent study of the activity of the enzymes peroxidase, protease, esterase and amylase. The equipment consisted of a one-gallon (3.8 litre) Waring Blendor and a stainless steel cylinder (capacity about 15 litres), both insulated and connected to a cryostat able to reach −80°C. Phenolic compounds were not present in the powder, as indicated by lack of discoloration and precipitation of the respective enzyme extracts, which were prepared without polyvinylpyrrolidone (PVP) and without agents against condensation of quinones.
    Notes: Zusammenfassung In aufeinanderfolgenden Zeitspannen wurden einer in kontrollierter Atmosphäre bei 3–4°C aufbewahrten Partie von Golden Delicious-Äpfeln (180 kg) jeweils Proben von 30–50 Früchten entnommen. Für die Herstellung von Acetonpulver wurde ein einfaches Gerät entwickelt, mit dem das Studium der Peroxidase, Protease, Esterase und Amylase durchgeführt werden konnte. Das Gerät besteht aus einem Mischer (3,81) und einem rostfreien Stahlzylinder (151). Beide Geräte wurden gegen Kälteverluste isoliert und mit einem Kryostat mit einer Kapazität bis zu −80°C verbunden. Das Pulver enthielt keine phenolischen Verbindungen, weil Verfärbungen oder Niederschläge im Pulverextrakt nicht mehr auftraten. Die Extraktion der Enzyme wurde ohne Polyvinylpyrrolidon (PVP) oder anderen Hilfsstoffen gegen die Kondensation der Chinonen vorgenommen.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    European food research and technology 164 (1977), S. 177-179 
    ISSN: 1438-2385
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Description / Table of Contents: Summary Peroxidase isoenzymes patterns in Golden Delicious apples were similar during the ripening and senescence stages. There were no extra bands at the peaks of peroxidase activity. Therefore the increase in enzyme activity was not caused by synthesisde novo.
    Notes: Zusammenfassung Die Peroxidase-Isoenzym-Muster aus Golden Delicious Äpfeln waren während der Reife und der Alterung identisch. In den Gipfeln der Peroxidase-Aktivität wurden keine zusätzlichen Zonen festgestellt. Daher dürfte die Zunahme der Enzymaktität nicht durch „de novo”-Synthese bedingt sein.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    European food research and technology 174 (1982), S. 1-4 
    ISSN: 1438-2385
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Description / Table of Contents: Summary Sensory analysis and chemical determination of several compounds demonstrated that a batch of Golden Delicious apples, size 70–75/80 mm with al-malate content equal or higher than 0.55% and of sucrose equal or higher than 2% was acceptable on the basis of internal quality. The model is predictive. l-Malate is associated with texture and juiciness, but not with sourness. Sucrose is associated with texture, juiciness, sweetness and flavour. In this manner, all sensory attributes except odour and sourness are represented byl-malate and sucrose contents. Association of production rates of n-hexyl acetate and n-butyl acetate with odour and flavour was not reproducible with aggregated data data of a preliminary trial and the main trial. Consequently production of volatiles were excluded from the chemical model.
    Notes: Zusammenfassung Die sensorische Analyse und chemische Bestimmung von verschiedenen Inhaltsstoffen zeigten, daß eine Partie Golden Delicious Äpfel (Durchmesser 70–80 mm) mit eineml-Äpfelsaure-und Sacharose-Gehalt von mindestens 0,55% bzw. 2% auf Grund der inneren Qualität akzeptierbar ist. Mit diesem Modell ist eine Voraussage möglich. Diel-Äpfelsäure ist mit der Textur und mit der Saftigkeit verknüpft, nicht aber mit dem Säure-Gehalt. Die Sacharose korreliert mit der Textur, der Saftigkeit, der Süße und mit dem Aroma. In dieser Weise werden alle sensorischen Eigenschaften durch diel-Äpfelsäure und den Sacharosegehalt repräsentiert mit Ausnahme des Aromas und dem Säure-Gehalt. Aus der Kombination der Daten des Hauptexperiments mit den Daten eines früheren Experiments läßt sich kein deutlicher Zusammenhang zwischen der n-Hexyl-oder n-Butyl-acetat-Entwicklung und dem Aroma oder Geschmack ableiten. Folglich kann auf die Entwicklung der flüchtigen Substanzen nicht aus dem chemischen Modell geschlossen werden.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1438-2385
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Description / Table of Contents: Summary A method is described that permits estimation of chlorophyllsa andb and pheophytinsa andb. Pigments were extracted with acetone and subjected to thin-layer chromatography on commercially prepared plates. The separated pigments were measured by irradiation at wavelength 360 nm and fluorescence above 630 nm on the plate. Data were compared with those obtained by a spectrophotometric method of pigment extract without purification. Concentrations of pheophytinb obtained by two equations with the spectrophotometric method conflicted with one another and with the new method. Extrapolation of retained chlorophyllb to zero time of boiling gave a more appropriate result with the results from our method.
    Notes: Zusammenfassuug Ein Verfahren zur Bestimmung von Chlorophylla andb, and Phaeophytina andb wird beschrieben. Die Pigmente wurden mit Aceton extrahiert, auf Dünnschichtfertigplatten chromatographiert und Pigmente wurden gemessen mittels Ultraviolettbestrahlung der Platten bei 360 nm und Fluorescenz über 630 nm bestimmt. Die Ergebnisse wurden mit denen einer spektrophotometrischen Methode ohne Auftrennung verglichen. Die Analysendaten von Phaeophytinb nach zwei Formeln der spectrophotometrische Methode differierten untereinander und mit jenen der neuen Methode. Der zu Kochzeit Null extrapolierte Wert der Chlorophyllb-Retention ist mit nahezu 100% nach unserer Methode am zuverlässigsten.
    Type of Medium: Electronic Resource
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