Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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    A sound approach: Exploring a rapid and non-destructive ultrasonic pulse echo system for vegetable oils characterization
    Yan, Jing ; Wright, William M.D. ; O'Mahony, James A. ; Roos, Yrjö ; Cuijpers, Eric ; Ruth, Saskia M. van - \ 2019
    Food Research International 125 (2019). - ISSN 0963-9969
    Density - Fatty acids - Rheology - Ultrasonic velocity

    A rapid and non-destructive ultrasonic pulse echo system was developed for vegetable oils characterization. To understand the differences in the ultrasonic properties of the oils, physical traits, such as their viscosity and density, were related to the ultrasonic data. In turn, these physical traits were correlated with the fatty acid compositions of the oils. Eighty oil samples, including 30 extra virgin olive oil (EVOO), 15 refined olive oil, 15 pomace olive oil, 10 rapeseed oil, 5 sunflower oil and 5 peanut oil samples, were analysed for their sound properties, viscosities, densities and fatty acid compositions. It was observed that the ultrasonic velocity of EVOO decreased linearly with increase in temperature, the temperature coefficient of ultrasonic velocity in EVOO was −2.92 m·s−1·°C−1. The ultrasonic velocity of EVOO (1453 ± 2 m/s) differed significantly from those of pomace olive oil and the oils of other botanical origin, but not from the velocity of refined olive oil. Ultrasonic velocity was positively correlated with the density and negatively correlated with the viscosity of the oils. The higher density and lower viscosity of the oils were in turn related to a higher unsaturation degree of the oils. Hence, oils with a higher proportion of unsaturated fat present higher densities and lower viscosities, which resulted in higher ultrasonic velocity values. Ultrasonic measurements allow rapid, non-destructive analysis, and this first application for characterization of these oils is promising.

    Heldere herleidbaarheid in de visketen
    Asselt, E.D. van; Roest, J.G. van der; Staats, M. ; Kok, E.J. ; Cuijpers, H.J.J. ; Ruth, S.M. van - \ 2015
    RIKILT Wageningen UR (RIKILT-rapport 2015.013) - 39
    technologie - visproducten - analytische methoden - naspeurbaarheid - vis - visverwerking - diepvriesvis - schaaldieren - garnalen - kabeljauw - verse producten - technology - fish products - analytical methods - traceability - fish - fish processing - frozen fish - shellfish - shrimps - cod - fresh products
    Heldere herleidbaarheid betekent dat kenmerken die bij verkoop worden toegekend aan visproducten terug te herleiden zijn in de keten. Het gaat daarbij om aspecten als de vissoort, maar ook de geografische oorsprong en de processing van de vis. Om de consument volledig inzicht te bieden in productinformatie is de etiketteringswetgeving ((EU) 1169/2011) recent aangescherpt en dienen dergelijke aspecten op het etiket vermeld te worden. In dit project is onderzocht welke administratieve en analytische methoden gebruikt kunnen worden om de voorgeschiedenis van visproducten aan te tonen. Er is gewerkt aan vier deelprojecten die door de projectpartners als prioriteit werden aangemerkt: administratieve traceerbaarheid in de kabeljauwketen, aantonen van watergehaltes in garnalen, vaststellen van geografische oorsprong van witpootgarnalen en onderscheid tussen verse en ontdooide vis. De resultaten van deze vier onderzoeken zijn in dit rapport beschreven.
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