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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 33 (1985), S. 232-235 
    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
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 50 (1985), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: 1-(E,Z)-3,5-undecatriene and 1-(E,Z,Z)-3,5,8-undecatetraene were isolated under enzyme inhibition from edible parts of peach, passion fruit, and kiwi; the triene only was found in celery, parsley, mandarine, apple and pear. Capillary gas chromatography, sniffing-capillary gas chromatography, and combined “live”-capillary gas chromatography-mass spectrometry of the concentrated liquid-liquid extracts were used to establish their identity. Owing to their ultra-low odor detection thresholds and the proposed biogenesis, these trace compounds may be “character impacts” in a wide variety of food flavors of plant origin.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    European food research and technology 183 (1986), S. 169-171 
    ISSN: 1438-2385
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Description / Table of Contents: Zusammenfassung Die Aromastoffe von frischen und gefriergetrockneten Bananenscheiben wurden nach extraktiver Anreicherung mittels Gaschromatographie/Massenspektrometrie untersucht. Während zahlreiche Komponenten in der stärkereichen Matrix gut zurückgehalten werden, erfahren die leichtflüchtigen Carboxylester Verluste von 50–80%. Zur Kompensation der Verluste der sensorisch besonders wichtigen Isopentylester sind Bananenfrüchte vor dem Trocknungsschritt dem biotechnologischen Verfahren der PA (=precursorhaltige Atmosphäre) — Lagerung unterzogen worden. Durch die Nutzung natürlicher Stoffwechselwege wird eine beträchtliche Aromaanreicherung im Fruchtgewebe erzielt. Es resultiert ein qualitativ verbessertes Trockenprodukt mit einem Isopentylestergehalt, der dem von frischen Früchten entspricht.
    Notes: Summary The flavour compounds of fresh and freeze-dried banana slices were concentrated by solvent extraction and investigated by gas chromatography/mass spectrometry. While many compounds show good retention in the starchy matrix, the highly volatile carboxylic esters show losses from 50 to 80%. Compensating for the losses of the isopentyl esters — compounds of special sensory importance — bananas were submitted to the biotechnological process of PA (=precursor atmosphere) — storage prior to dehydration. A considerable flavour accumulation in the fruit tissue is achieved by using natural metabolic pathways. As a result a quality improved dry product — containing a similar amount of isopentyl esters as the fresh fruit — is obtained.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    European food research and technology 188 (1989), S. 122-126 
    ISSN: 1438-2385
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Description / Table of Contents: Summary The volatile constituents of cape gooseberry (Physalis peruviana L.) were characterized using liquid/liquid extraction and fractionation of the flavour concentrates on silica gel, followed by high resolution gas chromatography and coupled gas chromatography — mass spectrometry. Sniffing gas chromatography of serially diluted flavour extracts showed methyl 2-methylbutyrate, 2,5-dimethyl-4-hydroxy-(2H)-furanone and its 4-methoxy derivative, 4- and 5-octanolide, β-ionone, and β-damascenone to be impact components. The non-volatile flavour fraction contained glucose, fructose, sucrose, citric acid, and smaller amounts of organic aliphatic and benzoic acids. The bound forms of volatiles were dominated by benzyl alcohol, 2-methylpropanol, and 2-methyl-butanol. The presence of significant amounts of activated acyl moieties in the fruit was indirectly concluded from various data.
    Notes: Zusammenfassung Die flüchtigen Inhaltsstoffe der Kapstachelbeere (Physalis peruviana L.) sind nach Flüssig/Flüssig-Extraktion und Kieselgelfraktionierung der Aromakonzentrate mittels hochauflösender Gaschromatographie und Kopplung Gaschromatographie-Massenspektrometrie charakterisiert worden. Durch gaschromatographische Sniffing-Analyse von sukzessive verdünnten Aromaextrakten sind 2-Methylbuttersäuremethylester, 2,5-Dimethyl-4-hydroxy-3(2H)-furanon und dessen Methoxyderivat, 4- und 5-Octanolid sowie β-Jonon and β-Damascenon als sensorische Schlüsselsubstanzen erkannt worden. Die nichtflüchtige Aromafraktion enthält Glucose, Fructose, Saccharose, Citronensäure und kleinere Mengen an organischen, aliphatischen und benzoiden Säuren. Bei den gebunden vorliegenden flüchtigen Komponenten dominieren Benzylalkohol, 2-Methylpropanol und 2-Methylbutanol. Die Frucht enthält, wie verschiedene Befunde indirekt belegen, größere Mengen an aktivierten Acylresten.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Plant cell, tissue and organ culture 15 (1988), S. 137-147 
    ISSN: 1573-5044
    Keywords: acid phosphatase ; apple cell culture ; esterase ; α-galactosidase ; β-glucosidase ; intra-and extracellular enzymes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The time course of the activities of esterase, α-galactosidase, and β-glucosidase in cell sap and nutrient medium in in vitro cultured apple cells (Malus sylvestris Mill.) was studied. The corresponding isozyme patterns and the intracellular and extracellular isozyme patterns of acid phosphatase and polyphenol oxidase were compared using isozyme visualization methods adapted to ultra-thin-layer isoelectric focusing. Neither quantitative (total activity) nor qualitative (isozyme pattern) data were congruent for cell saps and nutrient media. Malate dehydrogenase, malic enzyme, and glutamate dehydrogenase occurred in cell sap only. The extracellular activities probably originate to a great part from a programmed release by intact cells. Nutrient media of plant cell cultures constitute a rich source of active plant isozymes.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Plant cell, tissue and organ culture 8 (1987), S. 147-151 
    ISSN: 1573-5044
    Keywords: fruits ; cell homogenates ; linolenic acid ; flavour ; n-hexanal ; n-hexenals ; (Z)-3-hexenol ; light-dependence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Heterotrophic plant cells of three apple cultivars, two pear cultivars, strawberry, and tomato were cultured in vitro. Cell homogenates in the presence of linolenic acid formed n-hexanal, (Z)-3-hexenal, (E)-2-hexenal, and, in one apple cultivar, (Z)-3-hexenol and its acetate. Homogenates of photomixotropic apple cv. Goldparmäne cells contained eight times more (E)-2-hexenal than homogenates of non-green cells.
    Type of Medium: Electronic Resource
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