GLORIA

GEOMAR Library Ocean Research Information Access

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 31 (1983), S. 1237-1239 
    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
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of natural products 58 (1995), S. 1790-1793 
    ISSN: 1520-6025
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 1438-2385
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Description / Table of Contents: Zusammenfassung Ethylester von (E)-2-Octensäure, (Z)-4-Decensäure und (E,Z)-2,4-Decadiensäure sind nach Aromaabtrennung durch Flüssig-Flüssig-Extraktion mittels Capillargaschromatographie und Gaschromatographie-Massenspektrometrie-Kopplung als primäre Aromastoffe von Äpfeln der Sorte Red Delicious identifiziert und semiquantitativ bestimmt worden. Der Nachweis einer künstlichen Aromatisierung von Apfelprodukten mit den sog. “"Birnenestern” und deren mögliche Biosynthese in Äpfeln werden diskutiert.
    Notes: Summary Ethyl esters of (E)-2-octenoic acid, (Z)-4-decenoic acid and (E,Z)-2,4-decadienoic acid were found to be genuine aroma compounds in apples of the cultivar Red Delicious and have been estimated semiquantitatively employing aroma separation by liquid-liquid extraction, capillary gas chromatography and coupled gas chromatography-mass spectrometry. The artificial flavouring of apple products with the so called “pear esters” and their possible biosynthesis in apples are discussed.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Springer
    European food research and technology 176 (1983), S. 275-280 
    ISSN: 1438-2385
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Description / Table of Contents: Zusammenfassung Eine Vergrößerung des Verhältnisses von Oberfläche zu Volumen durch Macerationsenzyme bei Erdbeer- und Bananenfrüchten führt nicht zu einem Anstieg der für die Aromabiosynthese verantwortlichen metabolischen Aktivitäten. Werden Erdbeersegmente unter spezifischen Bedingungen mit exogenen kurzkettigen Fettsäuren versorgt, tritt ein kontinuierlicher Konzentrationsanstieg bei verschiedenen fruchttypischen Aromakomponenten auf, der mehr als 36 Std andauert. Bei Erdbeermaceraten ist die Biosynthese der Methylester verschiedener geradkettiger Fettsäuren (C12–C18) die wichtigste gaschromatographisch nachweisbare Veränderung nach Zugabe der genannten Precursoren. Bei Bananenpulpe führt dieselbe Macerationsmethode zu Homogenaten, deren Estergehalte einige Std konstant bleiben. Ein Teil der Befunde spricht dafür, daß der enzymatischen Zerkleinerung der Fruchtgewebe eine wundinduzierte Reorganisation des Stoffwechsels folgt, wobei die prinzipielle Fähigkeit zur Carboxylesterbildung mehr als vier Tage erhalten bleibt.
    Notes: Summary An increase in the ratio of surface to volume in strawberries and bananas using macerating enzymes does not result in an increase of the metabolic activities involved in aroma biosynthesis. Feeding strawberry segments with shortchain fatty acids as precursors under specific conditions causes a continuous increase of various fruit-typical aroma compounds and lasts for more than 36 h. In macerates of strawberries, upon addition of the above precursors, the biosynthesis of methyl esters of various unbranched fatty acids (C12–C18) is the most important GC-detectable change. The same maceration method applied to banana pulp yields macerates with an ester content which remains constant for some hours. A number of facts show that the enzymic commination of the fruit tissues is followed by a wound induced reorganisation of metabolic path-ways, with the principal capability to form carboxylic esters remaining for more than four days.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Springer
    European food research and technology 177 (1983), S. 328-332 
    ISSN: 1438-2385
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Description / Table of Contents: Zusammenfassung Sellerieknollen wurden nach mechanischer Zerkleinerung mit Hilfe von Rohament P enzymatisch maceriert bzw. mit einem Gemisch von Rohament P und Cellulase enzymatisch verflüssigt. Das Macerat und das Solubilisat wurden durch Walzen-und Gefriertrocknung zu Pulvern weiterverarbeitet. Die neutralen flüchtigen Bestandteile der Pulver wurden nach extraktiver Anreicherung und Reinigung über Kieselgelsäulen mittels Gaschromatographie und Gaschromatographie/Massenspektrometrie-Kopplung untersucht. Zur Bestimmung der originären Aromastoffzusammensetzung von frischer Sellerie sind die Knollen (Enzyminhibierung mit Methanol) unter identischen Bedingungen wie die Pulver aufgearbeitet worden. Quantitative Bestimmungen ergaben, daß im walzengetrockneten Pulver die Konzentrationen der Mehrzahl der flüchtigen Verbindungen sowie der wertgebenden Phthalide im Vergleich zum frischen Material drastisch reduziert wurden. Nach Gefriertrocknung waren die leichtflüchtigen Verbindungen noch in hohen Konzentrationen vorhanden und die Summe der Phthalide noch etwa zur Hälfte erhalten. Der durch die enzymatische Vorbehandlung bewirkte intensive Aufschluß des pflanzlichen Materials hatte bei Weiterverarbeitung zu Trockenprodukten eine deutliche Verminderung der Aromagehalte zur Folge.
    Notes: Summary Powders of celery tubers were prepared by mechanical comminution followed by enzymatic maceration with Rohament P resp. enzymatic liquefaction with a mixture of Rohament P and cellulase. The neutral volatile constituents of the drum dried, resp. freeze-dried powders, were enriched by solvent extraction, purified on silica gel columns and investigated by gas chromatography and gas chromatography coupled with mass spectrometry. The original aroma composition of fresh celery tubers (following inactivation of endogenous enzymes with methanol) was analyzed under identical conditions as for the powders. Quantitative comparison of the results showed that the concentration of most of the volatile compounds and also the aromatically valuable phthalides were drastically reduced by drum-drying. After freeze-drying the volatiles were present at much higher concentrations and about half of the phthalides were still present. Mechanical and enzymatic comminution of celery tubers followed by processing to dry products results in a significant decrease of the aroma content.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 6
    ISSN: 1619-7089
    Keywords: Key words: Blood-brain barrier ; Brain uptake ; Serotonin receptor binding ; technetium-99m complexes ; pKa values ; Lipophilicity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Low brain uptake is a generally accepted problem in developing technetium-99m brain receptor imaging agents. For a class of potential 5-HT2A receptor-binding agents we tried to improve the original low brain uptake of 0.4% injected dose (ID) in rats 5 min p.i. by modifying the lipophilic properties of the molecules. Because of the presence of a protonable nitrogen, which according to the pK a value leads to ionization of the molecule at blood pH, the pK a value was considered to be the parameter most suitable for adjustment of lipophilicity. Insertion of ether-oxygen in the molecule of five candidates lowers the apparent pK a value from 10.0 to 8.3 and dramatically increases the brain uptake to 1.3% ID at 5 min. The direct relationship between brain uptake and apparent pK a cannot be simply explained by the increase in the pK a-governed proportion of the neutral species.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 7
    ISSN: 1619-7089
    Keywords: Blood-brain barrier ; Brain uptake ; Serotonin receptor binding ; technetium-99m complexes ; pK a values ; Lipophilicity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Low brain uptake is a generally accepted problem in developing technetium-99m brain receptor imaging agents. For a class of potential 5-HT2A receptorbinding agents we tried to improve the original low brain uptake of 0.4% injected dose (ID) in rats 5 min p.i. by modifying the lipophilic properties of the molecules. Because of the presence of a protonable nitrogen, which according to the pK a value leads to ionization of the molecule at blood pH, the pK a value was considered to be the parameter most suitable for adjustment of lipophilicity. Insertion of ether-oxygen in the molecule of five candidates lowers the apparent pK a value from 10.0 to 8.3 and dramatically increases the brain uptake to 1.3% ID at 5 min. The direct relationship between brain uptake and apparent pK a cannot be simply explained by the increase in the pK a-governed proportion of the neutral species.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Plant cell, tissue and organ culture 46 (1996), S. 131-136 
    ISSN: 1573-5044
    Keywords: elicitation ; furocoumarins ; Petroselinum crispum ; photomixotrophy ; phthalides ; volatile compounds
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Photomixotrophic cells of Petroselinum crispum accumulated 〉500 mg chlorophyll per kg wet weight and grew well in a broad range of phytoeffector conditions. Autoclaved fungal cells were lethal for photoheterotrophic cells, but induced in photomixotrophic cells the formation of volatile n-alkanes, phthalides, coumarins, and elemicine. Most of the compounds elicited reached a concentration maximum between 20 and 30 h after addition of the mycelium, whereas the group of n-alkanes increased steadily during the 90 h monitored. Maximum concentrations were: 12 mg of graveolone, 1 mg of bergapten, 0.5 mg of sedanenolide, and 0.5 mg of n-tetradecane per 1 nutrient medium. A dose/effect relationship was found; 10 to 25 g of fungal wet weight per 1 culture medium resulted in maximum accumulation of volatiles. The formation of volatiles by photomixotrophic in vitro cells is discussed as an integral part of plant responses to ecological stress.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Biotechnology techniques 9 (1995), S. 19-24 
    ISSN: 1573-6784
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Deionized water as well as simulated and genuine fermentation media, which contained varying concentrations of benzaldehyde and 4-decanolide, were used to investigate the applicability of selected styrene-divinylbenzene resins for low pressure downflow adsorption of aroma compounds in a fixed bed. The effects of flow rate and matrix on the respective breakthrough curve slopes were examined using the LUB-and the MTZ-model.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Biotechnology techniques 12 (1998), S. 539-544 
    ISSN: 1573-6784
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A fatty acid hydroperoxide lyase of mung beans has been covalently immobilized on different commercially available gels which represents the first immobilization of this type of enzyme from a higher plant. UltraLink Iodoacetyl possessed optimum coupling properties and yielded a maximum activity of 1.3 U ml−1 gel and a yield of 84%. The effect of various protective reagents (e.g. thiols, antioxidants) and of the substrate concentration on the re-usability of the immobilized enzyme was investigated. Compared to a control, the relative activity during re-use was enhanced 1.8- to 2.3-fold in the presence of dithiothreitol. As the hydroperoxide lyase was irreversibly inhibited by the substrate, its re-usability depended strongly on the hydroperoxide concentration. The lowest inactivation was with 55 μM hydroperoxide which resulted in a relative activity of 73% after the third cycle. The storage stability of the hydroperoxide lyase was significantly improved by immobilization and resulted in a relative activity of 86% after 18 days, whereas the soluble enzyme lost 68% of its initial activity. © Rapid Science Ltd. 1998
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...