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  • 1
    Electronic Resource
    Electronic Resource
    Degradation Products of Trans-β-Carotene Produced during Extrusion Cooking (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 53 (1988), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Fifteen colored compounds, arising from the degradation of all-trans-β-carotene in extrusion cooking, were isolated by preparative column chromatography and high performance liquid chromatography (HPCL) and identified using chemical and spectrometric methods: six stereo-isomers of β-carotene, one diepoxide derivative, five apo-carotenals, a polyene ketone, one dihydroxide derivative, and one monohydroxide diepoxide derivative. The HPLC fractionation might be useful in food quality control for varied applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1988.tb07866.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Degradation of trans-β-Carotene during Heating in Sealed Glass Tubes and Extrusion Cooking (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 51 (1986), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Four compounds which have been previously reported as products of enzymatic and chemical oxidation reactions were isolated and identified for the first time from the epoxide fraction formed by heating all trans-β-carotene. A HPLC method allowing a quick separation and identification of these epoxides was developed. Extrusion cooking at 180°C was a more drastic treatment for the pigment than simple heating for a long period (2 hr) at the same temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1986.tb13915.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Interspecific relationships between emerging Atlantic salmon, Salmo salar, and coho salmon, Oncorhynchus kisutch, juveniles (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 35 (1989), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Interspecific relationships between Atlantic salmon and coho salmon were studied at early life stages in laboratory and semi-natural stream channels. During emergence, the survival and dispersal patterns were similar for the two species in single or mixed populations. Survival of Atlantic salmon fry was reduced in the presence of older coho fry. However, no predation was observed. Microdistribution differed between the two species, with Atlantic salmon fry more numerous in riffles when coho were present.Coho juveniles had a pelagic and gregarious distribution, in contrast to the benthic behaviour of the Atlantic salmon. In laboratory streams, Atlantic salmon fry moved out or adopted a subordinate cryptic behaviour which allowed them to escape predation while negatively affecting their growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1989.tb03072.x
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  • 4
    Electronic Resource
    Electronic Resource
    Model independent bounds on reaction cross-sections in heavy-ion scattering (1985)
    Springer
    The European physical journal 322 (1985), S. 499-505 
    Details
    ISSN: 1434-601X
    Keywords: 25.70. Cd ; 24.90+ d
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A simple and tractable rule is given to obtain model independent bounds on reaction cross-sections between charged particles. Comparison with other methods is made and conditions of applicability given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01412087
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  • 5
    Electronic Resource
    Electronic Resource
    Optimization of the isocratic non-aqueous reverse phase (NARP) HPLC separation of trans/cis-α-and β-carotenes (1989)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 12 (1989), S. 447-454 
    Details
    ISSN: 0935-6304
    Keywords: Reverse phase chromatography, RP-HPLC ; Optimization ; Polymeric phase ; Dehydrated carrots ; Isomeric carotenes ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Non-aqueous reverse phase chromatography was used to optimize the separation of all-trans-α- and β-carotenes and their cis isomers extracted from dried carrots. The technique can easily be applied to routine assays. Optimization was carried out by modifying the concentrations of methylene chloride and acetonitrile, and by studying the influence of temperature on the capacity factors and selectivity. The effect of the type of C 18 stationary phase bonding (mono- and polyfunctional) on separation was also examined. The need for polymeric bonding on the stationary phase is stressed for the realization of the trans/cis isomer separation.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240120705
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    Paper (German National Licenses)
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