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Goosen, C. (author), van der Maarel, M.J.E.C. (author), Dijkhuizen, L. (author), TNO Kwaliteit van Leven (author)The purified exo-inulinase enzyme of Aspergillus niger N402 (AngInuE; heterologously expressed in Escherichia coli) displayed a sucrose:inulin (S/I) hydrolysis ratio of 2.3, characteristic for a typical exo-inulinase. The enzyme also had significant transfructosylating activity with increasing sucrose concentrations, producing various...article 2008
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Steeneken, P.A.M. (author), Tas, A.C. (author), Woortman, A.J.J. (author), Sanders, P. (author), Mijland, P.J.H.C. (author), de Weijs, L.G.R. (author), TNO Kwaliteit van Leven (author)The effect of the granule structure on the methylation of starch was investigated by comparing the substitution patterns of potato starch methylated in granular suspension and in solution to DS 0.3. Substitution patterns were analyzed by successive digestion with α-amylase and amyloglucosidase, fractionation of the resulting malto...article 2008
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Hogervorst, M.A. (author), van Damme, W.J.M. (author), TNO Defensie en Veiligheid (author)Purpose. The purpose of our study was to develop a tool to visualize the limitations posed by visual impairments in detecting small and low-contrast elements in natural images. This visualization tool incorporates existing models of several aspects of visual perception, such as the band-limited contrast model of Peli (J Opt Soc Am A 1996;13:1131...article 2008
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Huisman, D.J. (author), Pols, S. (author), Joosten, I. (author), van Os, B.J.H. (author), Smit, A. (author), TNO Bouw en Ondergrond (author)A group of Roman glass objects from the Bocholtz burial in the SW of Limburg (The Netherlands) was found to have been subject to varying degrees of degradation. Many of the 25 colourless glass objects were fragmented to pieces <0.1 cm ("sugared"), whereas the three transparent blue-green glass objects were in near-pristine state. Analyses using...article 2008
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Engelen, L. (author), van den Keybus, P.A.M. (author), de Wijk, R.A. (author), Veerman, E.C.I. (author), Amerongen, A.V.N. (author), Bosman, F. (author), Prinz, J.F. (author), van der Bilt, A. (author), TNO Kwaliteit van Leven (author)Saliva is expected to be of significance for the perception of food stimuli in the mouth. Mixing the food with saliva, including breakdown and dilution, is considered to be of large importance for semi-solids as these products are masticated without chewing. It is known that there are large variations in composition of saliva originating from...article 2007
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Slimani, N. (author), Deharveng, G. (author), Unwin, I. (author), Southgate, D.A.T. (author), Vignat, J. (author), Skeie, G. (author), Salvini, S. (author), Parpinel, M. (author), Møller, A. (author), Ireland, J. (author), Becker, W. (author), Farran, A. (author), Westenbrink, S. (author), Vasilopoulou, E. (author), Unwin, J. (author), Borgejordet, Å. (author), Rohrmann, S. (author), Church, S. (author), Gnagnarella, P. (author), Casagrande, C. (author), van Bakel, M. (author), Niravong, M. (author), Boutron-Ruault, M.C. (author), Stripp, C. (author), Tjønneland, A. (author), Trichopoulou, A. (author), Georga, K. (author), Nilsson, S. (author), Mattisson, I. (author), Ray, J. (author), Boeing, H. (author), Ocké, M. (author), Peeters, P.H.M. (author), Jakszyn, P. (author), Amiano, P. (author), Engeset, D. (author), Lund, E. (author), Santucci de Magistris, M. (author), Sacerdote, C. (author), Welch, A. (author), Bingham, S. (author), Subar, A.F. (author), Riboli, E. (author), TNO Kwaliteit van Leven (author)Objective: This paper describes the ad hoc methodological concepts and procedures developed to improve the comparability of Nutrient databases (NDBs) across the 10 European countries participating in the European Prospective Investigation into Cancer and Nutrition (EPIC). This was required because there is currently no European reference NDB...article 2007
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Coulier, L. (author), Bas, R. (author), Jespersen, S. (author), Verheij, E. (author), van der Werf, M.J. (author), Hankemeier, T. (author), TNO Kwaliteit van Leven TNO Voeding (author)We have developed an analytical method, consisting of ion-pair liquid chromatography coupled to electrospray ionization mass spectrometry (IP-LC-ESI-MS), for the simultaneous quantitative analysis of several key classes of polar metabolites, like nucleotides, coenzyme A esters, sugar nucleotides, and sugar bisphosphates. The use of the ion-pair...article 2006
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Smeets, P.A.M. (author), de Graaf, C. (author), Stafleu, A. (author), van Osch, M.J.P. (author), Nievelstein, R.A.J. (author), van der Grond, J. (author), TNO Kwaliteit van Leven (author)Background: The brain plays a crucial role in the decision to eat, integrating multiple hormonal and neural signals. A key factor controlling food intake is selective satiety, ie, the phenomenon that the motivation to eat more of a food decreases more than does the motivation to eat foods not eaten. Objective: We investigated the effect of...article 2006
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Vente, J.A. (author), Bosch, H. (author), de Haan, A.B. (author), Bussman, P.J.T. (author), TNO Kwaliteit van Leven (author)The goal of this work was to enchance the selectivity of the separation of fructose or glucose from carbohydrate mixtures with adsorbents capable of reversible reaction. The experimental data presented demonstrate the feasibility of separating glucose from trans-galacto-oligosaccharides and fructose from fructo-oligosaccharides using resins as...article 2006
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Koek, M.M. (author), Muilwijk, B. (author), van der Werf, M.J. (author), Hankemeier, T. (author), TNO Kwaliteit van Leven (author)An analytical method was set up suitable for the analysis of microbial metabolomes, consisting of an oximation and silylation derivatization reaction and subsequent analysis by gas chromatography coupled to mass spectrometry. Microbial matrixes contain many compounds that potentially interfere with either the derivatization procedure or analysis...article 2006
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Kralj, S. (author), van Geel-Schutten, G.H. (author), Faber, E.J. (author), van der Maarel, M.J.E.C. (author), Dijkhuizen, L. (author), TNO Kwaliteit van Leven (author)Glucansucrase or glucosyltransferase (GTF) enzymes of lactic acid bacteria display high sequence similarity but catalyze synthesis of different α-glucans (e.g., dextran, mutan, alternan, and reuteran) from sucrose. The variations in glucosidic linkage specificity observed in products of different glucansucrase enzymes appear to be based on...article 2005
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Bobeldijk, I. (author), Boonzaaijer, G. (author), Spies-Faber, E.J. (author), Vaes, W.H.J. (author), TNO Kwaliteit van Leven (author)Reversed-phase liquid chromatography and detection with atmospheric pressure chemical ionisation tandem mass spectrometry was used for the determination of kava extracts in herbal mixtures. One percent of kava extract can be detected, corresponding to approximately 0.05-0.2 mg/g of the individual kava lactones kavain, dihydrokavain, yangonin,...article 2005
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TNO Kwaliteit van Leven (author), Kralj, S. (author), Stripling, E. (author), Sanders, P. (author), van Geel-Schutten, G.H. (author), Dijkhuizen, L. (author)Lactobacillus reuteri strain ATCC 55730 (LB BIO) was isolated as a pure culture from a Reuteri tablet purchased from the BioGaia company. This probiotic strain produces a soluble glucan (reuteran), in which the majority of the linkages are of the alpha-(1→4) glucosidic type (∼70%). This reuteran also contains alpha-(1→6)-linked glucosyl units...article 2005
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de Groot, J. (author)Accumulation of advanced glycation endproducts (AGEs) plays a crucial part in the development of age-related diseases and diabetic complications. AGEs are formed in vivo via the so-called Maillard reaction: a reducing sugar reacts with a protein to form a labile Amadori product that is subsequently stabilized, producing an irreversible, non...article 2004
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TNO Preventie en Gezondheid (author), El Oualid, F. (author), Burm, B.E.A. (author), Leroy, I.M. (author), Cohen, L.H. (author), van Boom, J.H. (author), van den Elst, H. (author), Overkleeft, H.S. (author), van der Marel, G.A. (author), Overhand, M. (author)Eleven analogues of the C-terminal Ca1a2X motif found in natural substrates of the prenyl transferases PFT and PGGT-1 were synthesized and evaluated for their inhibition potency and selectivity against PFT and PGGT-1. Replacement of the central dipeptide part a1a 2 by a benzylated sugar amino acid resulted in a good and highly selective PFT...article 2004
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Kralj, S. (author), Geel van - Schutten, G.H. (author), van der Maarel, M.J.E.C. (author), Dijkhuizen, L. (author)Limited information is available about homopolysaccharide synthesis in the genus Lactobacillus. Using efficient screening techniques, extracellular glucosyltransferase (GTF) enzyme activity, resulting in α-glucan synthesis from sucrose, was detected in various lactobacilli. PCR with degenerate primers based on homologous boxes of known...article 2003
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Vermunt, S.H.F. (author), Pasman, W.J. (author), Schaafsma, G. (author), Kardinaal, A.F.M. (author), TNO Voeding (author)Weight reduction programmes are mainly focused on reducing intake of fat and sugar. In this review we have evaluated whether the replacement of dietary (added) sugar by low-energy sweeteners or complex carbohydrates contributes to weight reduction. In two experimental studies, no short-term differences in weight loss were observed after use of...article 2003
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de Jong, A.E.I. (author), Eijhusen, G.P. (author), Brouwer-Post, E.J.F. (author), Grand, M. (author), Johansson, T. (author), Kärkkäinen, T. (author), Marugg, J. (author), in 't Veld, P.H. (author), Warmerdam, F.H.M. (author), Wörner, G. (author), Zicavo, A. (author), Rombouts, F.M. (author), Beumer, R.R. (author)Many media have been developed to enumerate Clostridium perfringens from foods. In this study, six media [iron sulfite (IS) agar, tryptose sulfite cycloserine (TSC) agar, Shahidi Ferguson perfringens (SFP) agar, sulfite cycloserine azide (SCA), differential clostridial agar (DCA), and oleandomycin polymyxin sulfadiazine perfringens (OPSP) agar]...article 2003
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TNO Voeding Centraal Instituut voor Voedingsonderzoek TNO (author), Posthuma, C.C. (author), Bader, R. (author), Engelmann, R. (author), Postma, P.W. (author), Hengstenberg, W. (author), Pouwels, P.H. (author)Purification of xylulose 5-phosphate phosphoketolase (XpkA), the central enzyme of the phosphoketolase pathway (PKP) in lactic acid bacteria, and cloning and sequence analysis of the encoding gene, xpkA, from Lactobacillus pentosus MD363 are described, xpkA encodes a 788-amino-acid protein with a calculated mass of 88,705 Da. Expression of xpkA...article 2002
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Chaillou, S. (author), Pouwels, P.H. (author), Postma, P.W. (author), Centraal Instituut voor Voedingsonderzoek TNO (author)We have identified and characterized the D-xylose transport system of Lactobacillus pentosus. Uptake of D-xylose was not driven by the proton motive force generated by malolactic fermentation and required D-xylose metabolism. The kinetics of D-xylose transport were indicative of a low- affinity facilitated-diffusion system with an apparent K(m)...article 1999