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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    Water-soluble polysaccharide extracts from the oyster culinary-medicinal mushroom pleurotus ostreatus (Agaricomycetes) with HMGCR inhibitory activity
    Gil-Ramírez, Alicia ; Smiderle, Fhernanda R. ; Morales, Diego ; Govers, Coen ; Synytsya, Andriy ; Wichers, Harry J. ; Iacomini, Marcello ; Soler-Rivas, Cristina - \ 2017
    International Journal of Medicinal Mushrooms 19 (2017)10. - ISSN 1521-9437 - p. 879 - 892.
    Caco2 - Cholesterol - HMGCR - Medicinal mushrooms - Pleurotus ostreatus - Polysaccharides - β-glucans
    Water extracts from Pleurotus ostreatus containing no statins showed 3-hydroxy-3-methyl-glutaryl CoA reductase (HMGCR) inhibitory activity (in vitro) that might be due to specific water-soluble polysaccharides (WSPs); when isolated and deproteinized, increasing concentrations of the WSP extract induced higher inhibition. The WSP extract contained mainly β-glucans, mannogalactans, and glycogen (e.g., α-glucans), although derivatives or fragments with lower molecular weights (between 14 and 3.5 kDa) were present and were able to induce the inhibitory activity. The extract contained more β-(1→3)-glucans than β-(1→3),(1→6)-glucans, and they partially survived digestion and managed to pass through Caco2 cell monolayers to the lower compartment after in vitro digestion and transport experiments. The WSP might also modulate Caco2 membrane integrity.
    Ligninolytic enzymes activities of Oyster mushrooms cultivated on OMW (olive mill waste) supplemented media, spawn and substrates
    Ruiz-Rodrigues, A. ; Polonia, I. ; Soler-Rivas, C. ; Wichers, H.J. - \ 2011
    International Biodeterioration and Biodegradation 65 (2011)2. - ISSN 0964-8305 - p. 285 - 293.
    pleurotus-sajor-caju - manganese peroxidase - alcohol oxidase - laccase - ostreatus - bioconversion - irradiation - fungi - water
    Ligninolytic enzymes activities (laccases, peroxidases (total, MnP and MiP) and aryl-alcohol oxidase (AAO)) were measured during the cultivation of six commercial Pleurotus sp. strains on MMP media, on cereal grains (spawn) and on straw substrates (the three commonly utilized cultivation steps to obtain fruiting bodies) supplemented with several concentrations of autoclaved (OMW) or gamma-irradiated (iOMW) olive mill waste. Results indicated that all the strains were able to grow on MMP media and spawn containing up to 30% OMW and iOMW and on straw substrates mixed with 50% OMW. None of the strains showed AAO activity and there was not a single strain which showed the highest laccases and peroxidases activities, independently of the utilized substrate. Pleurotus mycelia adjusted their enzymatic mechanisms depending on their variety, type of substrate, concentration of OMW or iOMW added. OMW was a better supplement to use than iOMW because OMW induced higher exo-enzymes activities.
    Effect of olive mill waste (OMW) supplementation to Oyster mushrooms substrates on the cultivation parameters and fruiting bodies quality
    Ruiz-Rodriguez, A. ; Soler-Rivas, C. ; Polonia, I. ; Wichers, H.J. - \ 2010
    International Biodeterioration and Biodegradation 64 (2010)7. - ISSN 0964-8305 - p. 638 - 645.
    pleurotus-ostreatus - enzyme-activities - wheat-straw - lignocellulosic wastes - edible mushrooms - water - white - edodes - fungi - bioremediation
    Seven Oyster mushroom strains were cultivated in wheat straw (WS) bags supplemented with 0 up to 90% olive mill waste (OMW), a solid residue obtained from a two-phases olive oil production system. All mushroom strains could grow but high OMW concentrations resulted in a significant yield, biological efficiency and productivity decrease, retarding of pinning and flushing and loss of fruiting bodies quality. However, most of the mushroom strains showed no significant differences on cultivation parameters and fruiting bodies quality (except for colour) between control (WS) substrates or substrates supplemented up to 50% OMW (w/w). Addition of 50% OMW to WS substrates turned mushrooms lighter and less reddish. This colour shift was not due to enzymatic oxidations or inhibition since laccase and peroxidase activities were not differing from control. Total phenolic content and antioxidant activity were also similar and no phenolic compounds from OMW were detected in the fruiting bodies. Some of the analysed Pleurotus strains were better suited to grow on OMW supplemented substrates than others.
    Microbiological effects of olive mill waste addition to substrates for Pleurotus pulmonarius cultivation
    Soler-Rivas, C. ; Garcia-Rosado, A. ; Polonia, I. ; Junca-Blanch, G. ; Marin, F.R. ; Wichers, H.J. - \ 2006
    International Biodeterioration and Biodegradation 57 (2006)1. - ISSN 0964-8305 - p. 37 - 44.
    agaricus-bisporus strains - phenolic-compounds - olea-europaea - oil - water - oleuropein - hydrolysis - hydroxytyrosol - antibacterial - polyphenols
    When olive mill wastes (OMWs) and vegetation waters (VWs) obtained during the manufacture of olive oil were added as substrate supplements for the cultivation of Pleurotus pulmonarius the material modified growth of the mushroom and the endemic microbiota of the substrate, in particular the mushroom-pathogenic bacterium Pseudomonas tolaasii, which is responsible for bacterial blotch disease in mushrooms. VW addition to substrates, at up to 30% (v/w), did not interfere with mycelial growth, but inhibited fruit body formation. Supplementation at up to 10% did not inhibit pinhead appearance and reduced Ps. tolaasii-related symptoms. In an attempt to identify the compounds responsible for the observed reduction of symptoms, products of acidic, basic or enzymic hydrolysis of oleuropein, together with OMW ethyl acetate extracts and several single compounds, were studied. OMW ethyl acetate extracts and hydroxytyrosol inhibited Ps. tolaasii growth, but did not show bactericidal activity. Only 4-methylcatechol and catechol were effective as bactericides against Ps. tolaasii (minimum biocidal concentration 5 and 10 mM, respectively). Such concentrations were not reached if the wastes were added at 10% v/w; at such levels growth of the bacteria will only be inhibited, not eliminated completely.
    Monitoring of and technological effects on allergenicity of proteins in the food industry
    Wichers, H.J. ; Matser, A.M. ; Amerongen, A. van; Wichers, J. ; Soler-Rivas, C. - \ 2004
    In: Plant Food Allergens / Shewry, P.R., Mills, E.N.C., Oxford, UK : Blackwell Scientific and Medical Publishers - ISBN 9780632059829 - p. 196 - 212.
    voedselallergieën - voedselindustrie - voedselverwerking - stoornissen samenhangend met voedsel - allergenen - eiwitten - food allergies - food industry - food processing - food-related disorders - allergens - proteins
    Induction of a tyrosinase mRNA in Agaricus bisporus upon treatment with a tolaasin preparation from Pseudomonas tolaasii
    Soler Rivas, C. ; Moeller, A.C. ; Arpin, N. ; Olivier, J. ; Wichers, H.J. - \ 2001
    Physiological and Molecular Plant Pathology 58 (2001)2. - ISSN 0885-5765 - p. 95 - 99.
    In Agaricus bisporus infected with Pseudomonas tolaasii, or treated with a partially purified tolaasin extract or with purified tolaasin, induction of a specific mRNA of the two sequences encoding tyrosinase was found. Tyrosinase isoforms in samples treated with several concentrations of a partially purified tolaasin (PT) extract were visualized after Western analysis and staining with polyclonal tyrosinase-specific antibodies. Similar concentration of a 67 kDa latent tyrosinase was shown in all the samples including the water-treated control but the treatment with the PT extract caused the post-translational modification of the protein into an active tyrosinase of 43 kDa.
    Impact of (bio)chemical and physical procedures on food allergen stability
    Soler Rivas, C. ; Wichers, H.J. - \ 2001
    Allergy 56 (2001)Suppl. 67. - ISSN 0105-4538 - p. 52 - 55.
    Synthesis of the antioxidant hydroxytyrosol using tyrosinase as biocatalyst
    Espin, J.C. ; Soler Rivas, C. ; Cantos, E. ; Tomas Barberan, F.A. ; Wichers, H.J. - \ 2001
    Journal of Agricultural and Food Chemistry 49 (2001)3. - ISSN 0021-8561 - p. 1187 - 1193.
    Maturation and activation of latent tyrosinase from Agaricus bisporus
    Espin, J.C. ; Soler Rivas, C. ; Wichers, H.J. - \ 2000
    In: Proceedings of the 15th International Congress on the Science and Cultivation of Edible Fungi, 15-19 May, at Maastricht (Netherlands)
    Characterization of the total free radical scavenger capacity of vegetable oils and oil fractions using 2,2-diphellyl-1-picrylhydrazyl radical
    Espin, J.C. ; Soler Rivas, C. ; Wichers, H.J. - \ 2000
    Journal of Agricultural and Food Chemistry 43 (2000)3. - ISSN 0021-8561 - p. 648 - 656.
    Anthocyanin-based natural colorants: A new source of antiradical activity for foodstuff
    Espin, J.C. ; Soler Rivas, C. ; Wichers, H.J. ; Garcia Viguera, C. - \ 2000
    Journal of Agricultural and Food Chemistry 48 (2000)5. - ISSN 0021-8561 - p. 1588 - 1592.
    The oxidation of 4-hydroxystilbene catalysed by mushroom, pear and grape polyphenol oxidases
    Espin, J.C. ; Soler-Rivas, C. ; Wichers, H.J. - \ 2000
    Recent Advances in Phytochemistry 1 (2000). - p. 7 - 18.
    Potential role of fungi for long term manned space missions
    Marin-Vinader, L. ; Eckhard, F. ; Lasseur, C. ; Wichers, H.J. ; Soler-Rivas, C. - \ 2000
    In: Proceedings of the 15th International Congress on the Science and Cultivation of Edible Fungi, 15-19 May, at Maastricht (Netherlands)
    A fast In Vitro method to screen for antioxidant activity of functional components in foodstuff
    Marin-Vinader, L. ; Wichers, H.J. ; Zondervan, C. ; Boeriu, C. ; Soler-Rivas, C. - \ 2000
    In: European Conference on Nutritional Enhancement of Plant Foods, 6-9 September, at Norwich (United Kingdom)
    FOOD: Fungus on Orbit Demonstration
    Soler-Rivas, C. ; Eckhard, F. ; Lasseur, C. ; Wichers, H.J. - \ 2000
    In: 30th International Conference on Experimental Systems, 10-13 July, at Toulouse (France)
    Characterization of the antioxidant (3,4-dihydroxyphenyl) ethanol ( hydroxytyrosol) enzymatically synthesised using mushroom tyrosinase
    Soler-Rivas, C. ; Wichers, H.J. ; Cantos, E. ; Espín, J.C. - \ 2000
    In: 20th International Conference on Polyphenols, 10-15 September, at Freising-Weihenstephan (Germany)
    Oleuropein and related compounds
    Soler-Rivas, C. ; Espin, J.C. ; Wichers, H.J. - \ 2000
    Journal of the Science of Food and Agriculture 80 (2000)7. - ISSN 0022-5142 - p. 1013 - 1023.
    An easy and fast test to compare total free radical scavenger capacity of foodstuffs
    Soler-Rivas, C. ; Espin, J.C. ; Wichers, H.J. - \ 2000
    Phytochemical Analysis 11 (2000)5. - ISSN 0958-0344 - p. 330 - 338.
    An easy and fast test has been designed to compare the total free radical scavenging capacity (RSC) of various food samples. Black and green teas from different countries, and wines of different brands were studied and compared as examples of coloured liquids (water- and methanol-soluble); oils from different sources were used as examples of lipidic foodstuffs; apples of different varieties and spinach were analysed as solid foods. Dilutions of extracts of the described foodstuffs were prepared and aliquots of each dilution were spotted onto TLC silica gel layers in the form of a dot-blot test: layers were stained with a methanolic solution of the 2,2-diphenyl-1-picrylhydrazyl radical. Dots of extracts of foodstuffs with RSC turned yellow, with a colour intensity depending on the RSC compounds present in the dilutions. After 1 h staining, the intensity of the yellow colour was measured with a chromameter (b* parameter) at one of the dilutions at which the colour value was linearly correlated to the concentration of the sample. According to these readings the different samples were organised in decreasing order of b* values, an order which corresponded to the decreasing order of RSC as determined by spectrophotometric methods. The dot-blot test was sensitive enough to detect differences of RSC between varieties and brands of water- or methanolsoluble products, but was not adequate for lipid-based compounds. The test was also able to follow the variation of RSC during food processing as in, for example, the heat-treatment of spinach. Copyright (C) 2000 John Wiley and Sons, Ltd.
    Determination of total antioxidant activity (TAA) in foodstuff using an easy and fast test to compare a wide range of samples
    Soler-Rivas, C. ; Espín, J.C. ; Swallow, K. ; Wichers, H.J. - \ 2000
    In: 10th Symposium of the ALW-Discussion Group on Secondary Metabolism in Plant and Plant Cell, 11 February, at Free University Amsterdam (Netherlands)
    Discoloration and tyrosinase activity in Agaricus bisporus fruit bodies infected with various pathogens
    Soler-Rivas, C. ; Arpin, N. ; Olivier, J.M. ; Wichers, H.J. - \ 2000
    Mycological Research 104 (2000)3. - ISSN 0953-7562 - p. 351 - 356.
    The discoloration of A. bisporus after infection by Pseudomonas tolaasii, P. gingeri, P. agarici, P. reactans, Verticillium fungicola and Trichoderma harzianum can be distinguished by chromametric measurements. Infection with P. tolaasii caused a specific colour change, independent of the bacterial concentration applied (ΔL = 54.7, Δa = 16.6, Δb = 28.7%). The colour change provoked by P. gingeri had a characteristic profile different from P. tolaasii (ΔL = 36.3, Δa = 14.1, Δb = 49.5%). P. agarici and P. reactans provoked only a slight increase of red colour. Response to T. harzianum was orange, and to V. fungicola brown, similar to P. tolaasii but paler and more yellowish. All pathogens except P. reactans provoked degradation of total tyrosinase to variable extents. Activation of tyrosinase was only observed after infection with P. tolaasii (to almost 7%) and V. fungicola (to 3%).
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