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O'Kane, F.E. (author), Happe, R.P. (author), Vereijken, J.M. (author), Gruppen, H. (author), van Boekel, M.A.J.S. (author), TNO Voeding (author)Gel network formation of pea legumin (8.4% on a protein basis, pH 7.6) was monitored via dynamic rheological measurements. Gelation was performed in the absence and presence of the thiol-blocking reagent N-ethylmaleimide, at different rates of heating and cooling. Overall, it was shown that pea legumin gel formation was not effected by changes...article 2004
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Koppelman, S.J. (author), Wensing, M. (author), Ertmann, M. (author), Knulst, A.C. (author), Knol, E.F. (author), TNO Voeding (author)Background: A number of allergenic proteins in peanut has been described and the relative importance of these allergens is yet to be determined. Objectives: We have investigated the relevance of previously identified peanut allergens in well-characterized peanut-allergic patients by in vitro, ex vivo and in vivo assays. Methods: Thirty-two adult...article 2004
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Characterization of Pea Vicilin. 1. Denoting Convicilin as the α-Subunit of the Pisum Vicilin FamilyO'Kane, F.E. (author), Happe, R.P. (author), Vereijken, J.M. (author), Gruppen, H. (author), van Boekel, M.A.J.S. (author), TNO Voeding Centraal Instituut voor Voedingsonderzoek TNO (author)Vicilin, a major globulin protein of pea that has been described as "extremely heterogeneous in terms of its polypeptide composition", was extracted from pea flour under alkaline conditions and subsequently fractionated by salt under acid conditions. This procedure induced the separation of vicilin into two fractions, which, after purification,...article 2004
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van Wijk, F. (author), Hartgring, S. (author), Koppelman, S.J. (author), Pieters, R. (author), Knippels, L.M.J. (author), TNO Voeding (author)Background: Peanut allergy is known for its severity and persistence through life. Several peanut proteins have been identified as allergenic and are indicated as Ara h 1-7. Very little is known about the mechanisms that underlie sensitization to peanut proteins. Objective: The purpose of the present study was to reveal the immune responses that...article 2004
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O'Kane, F.E. (author), Happe, R.P. (author), Vereijken, J.M. (author), Gruppen, H. (author), van Boekel, M.A.J.S. (author), TNO Voeding Centraal Instituut voor Voedingsonderzoek TNO (author)The gelling characteristics of two vicilin fractions from pea (Pisum sativum L.) were compared over a range of pH and salt conditions after preliminary results showed that despite having equal opportunity to unfold, and expose hydrophobic residues, they had different minimum gelling concentrations (at pH 7.6). Furthermore, at this pH one...article 2004
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Ladics, G.S. (author), Holsapple, M.P. (author), Astwood, J.D. (author), Kimber, I. (author), Knippels, L.M.J. (author), Helm, R.M. (author), Dong, W. (author)There is a need to assess the safety of foods deriving from genetically modified (GM) crops, including the allergenic potential of novel gene products. Presently, there is no single in vitro or in vivo model that has been validated for the identification or characterization of potential food allergens. Instead, the evaluation focuses on risk...article 2003
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Akkerdaas, J.H. (author), Wensing, M. (author), Knulst, A.C. (author), Krebitz, M. (author), Breiteneder, H. (author), de Vries, S. (author), Penninks, A.H. (author), Aalberse, R.C. (author), Hefle, S.L. (author), van Ree, R. (author)Background: Allergy to tree nuts, like hazelnuts, ranks among the most frequently observed food allergies. These allergies can start at early childhood and are, in contrast to other food allergies, not always outgrown by the patient. Tree nut allergy is frequently associated with severe reactions. Diagnosis partially relies on in vivo testing by...article 2003
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Wensing, M. (author), Knulst, A.C. (author), Piersma, S. (author), O'Kane, F. (author), Knol, E.F. (author), Koppelman, S.J. (author)Background: Serologic cross-reactivity among legumes has been described; however, it is rarely clinically significant. In this study 3 patients with a history of anaphylaxis to pea are described who subsequently had symptoms after ingestion of peanut. Objective: We investigated whether the peanut-related symptoms were due to cross-reactivity...article 2003
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Gaubius Instituut TNO (author), Walker, J.B. (author), Hughes, B. (author), James, I. (author), Haddock, P. (author), Kluft, C. (author), Bajzar, L. (author)Two competitive inhibitors of TAFIa (activated thrombin-activable fibrinolysis inhibitor), 2-guanidinoethyl-mercaptosuccinic acid and potato tuber carboxypeptidase inhibitor, variably affect fibrinolysis of clotted human plasma. Depending on their concentration, the inhibitors shortened, prolonged, or had no effect on lysis in vitro. The...article 2003
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Koppelman, S.J. (author), van Koningsveld, G.A. (author), Knulst, A.C. (author), Gruppen, H. (author), Pigmans, I.G.A.J. (author), de Jongh, H.H.J. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)The interaction of the major potato allergen patatin, Sol t 1, with IgE was investigated on a quantitative level as a function of heat treatment at different temperatures. On the basis of a number of publications, potato is considered to be a heat-labile allergen, but the molecular explanation for this behavior was not given. In this work, heat...article 2002
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van Koningsveld, G.A. (author), Walstra, P. (author), Gruppen, H. (author), Wijngaards, G. (author), van Boekel, M.A.J.S. (author), Voragen, A.G.J. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)In the present study, foam-forming and -stabilizing properties of potato proteins were studied using whipping and sparging tests. The soluble potato proteins are mainly composed of patatin and protease inhibitors. The whipping tests showed that less foam was formed from untreated patatin than from the protease inhibitors, but patatin foam was...article 2002
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van Duijn, G. (author), van Biert, R. (author), Bleeker-Marcelis, H. (author), van Boeijen, I. (author), Adan, A.J. (author), Jhakrie, S. (author), Hessing, M. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)According to European Commission (EC) Regulation 1139/98, foods and food ingredients that are to be delivered to the final consumer in which either protein or DNA resulting from genetic modification is present, shall be subject to additional specific labeling requirements. Since 1994, genetically altered tomatoes, squash, potatoes, canola,...article 2002
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TNO Voeding (author), van Duijn, G. (author), van Biert, R. (author), Bleeker-Marcelis, H. (author), van Boeijen, I. (author), Adan, A.J. (author), Jhakrie, S. (author), Hessing, M. (author)According to European Commission (EC) Regulation 1139/98, foods and food ingredients that are to be delivered to the final consumer in which either protein or DNA resulting from genetic modification is present, shall be subject to additional specific labeling requirements. Since 1994, genetically altered tomatoes, squash, potatoes, canola,...article 2002
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Centraal Instituut voor Voedingsonderzoek TNO TNO Voeding (author), Korthout, H.A.A.J (author), Caspers, M.P.M (author), Kottenhagen, M.J. (author), Helmer, Q. (author), Wang, M. (author)Over the past few years the presence of p53-like proteins in plants was frequently reported, by using the monoclonal antibody Pab240. By means of protein purification and screening a cDNA library, a Pab240 cross-reacting protein and a cDNA clone were isolated from barley. Peptide- and DNA-sequence analysis identified one and the same protein: 2...article 2002
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Koppelman, S.J. (author), Vlooswijk, R.A.A. (author), Knippels, L.M.J. (author), Hessing, M. (author), Knol, E.F. (author), van Reijsen, F.C. (author), Bruijnzeel-Koomen, C.A.F.M. (author)Background: The serology of peanut allergy seems to be different in various parts of the world. We analyzed the composition of 13 samples of three varieties of peanut in order to compare their allergenic nature. Methods: Peanut cultivars that are commonly processed in the West were analyzed for protein content, protein composition, and Ara h 1...article 2001
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Caspers, M.P.M. (author), Lok, F. (author), Sinjorgo, K.M.C. (author), van Zeijl, M. (author), Nielsen, K.A. (author), Cameron-Mills, V. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)We have identified the major endo-β-l,4-xylanase (XYN-1) in the aleurone of germinating barley grain, and show that it is expressed as a precursor of Mr 61 500 with both N- and C-terminal propeptides. XYN-1 is synthesized as an inactive enzyme in the cytoplasm, and only becomes active at a late stage of germination when the aleurone ceases to...article 2001
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Lakemond, C.M.M. (author), de Jongh, H.H.J. (author), Hessing, M. (author), Gruppen, H. (author), Voragen, A.G.J. (author)The 7S/11S glycinin equilibrium as found in Lakemond et al. (J. Agric. Food Chem. 2000, 48, xxxxxxxx) at ambient temperatures influences heat denaturation. It is found that the 7S form of glycinin denatures at a lower temperature than the 11S form, as demonstrated by a combination of calorimetric (DSC) and circular dichroism (CD) experiments. At...article 2000
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TNO Voeding (author), Lakemond, C.M.M. (author), de Jongh, H.H.J. (author), Hessing, M. (author), Gruppen, H. (author), Voragen, A.G.J. (author)This study describes the relationship between the solubility of glycinin, a major soy protein, and its structural properties at a quaternary, tertiary, and secondary folding level under conditions representative for food products. When the ionic strength is lowered from 0.5 to 0.2 or 0.03, the basic polypeptides shift more to the exterior of the...article 2000
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van Zeijl, M.J. (author), Testerink, C. (author), Kijne, J.W. (author), Wang, M. (author)Expression and post-translational modification of barley 14-3-3 isoforms, 14-3-3A, 14-3-3B and 14-3-3C, were investigated using isoform-specific antibodies. Although all three isoforms were shown to be present in the cytosolic, the nuclear and the microsomal cell fractions, differences in post-translational modification were identified for the...article 2000
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Gaubius Instituut TNO (author), Korthout, H.A.A.J. (author), Berecki, G. (author), Bruin, W. (author), van Duijn, B. (author), Wang, M. (author)Caspases play a very important role in initiating and executing apoptotic processes in animal cells. In this study we show that plant mitochondria were able to initiate the activation of caspase 3 in a Xenopus cell free system. Caspase 3-like activity was found to be present in plant cells and could only be inhibited by the specific caspase 3...article 2000