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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    Effects of a modestly lower carbohydrate diet in gestational diabetes : a randomized controlled trial
    Mijatovic, Jovana ; Louie, Jimmy Chun Yu ; Buso, Marion E.C. ; Atkinson, Fiona S. ; Ross, Glynis P. ; Markovic, Tania P. ; Brand-Miller, Jennie C. - \ 2020
    American Journal of Clinical Nutrition 112 (2020)2. - ISSN 0002-9165 - p. 284 - 292.
    diet - gestational diabetes - ketones - lower carbohydrate - MAMI study - metabolism

    BACKGROUND: Lower carbohydrate diets have the potential to improve glycemia but may increase ketonemia in women with gestational diabetes (GDM). We hypothesized that modestly lower carbohydrate intake would not increase ketonemia. OBJECTIVE: To compare blood ketone concentration, risk of ketonemia, and pregnancy outcomes in women with GDM randomly assigned to a lower carbohydrate diet or routine care. METHODS: Forty-six women aged (mean ± SEM) 33.3 ± 0.6 y and prepregnancy BMI 26.8 ± 0.9 kg/m2 were randomly assigned at 28.5 ± 0.4 wk to a modestly lower carbohydrate diet (MLC, ∼135 g/d carbohydrate) or routine care (RC, ∼200 g/d) for 6 wk. Blood ketones were ascertained by finger prick test strips and 3-d food diaries were collected at baseline and end of the intervention. RESULTS: There were no detectable differences in blood ketones between completers in the MLC group compared with the RC group (0.1 ± 0.0 compared with 0.1 ± 0.0 mmol/L, n = 33, P = 0.31, respectively), even though carbohydrate and total energy intake were significantly lower in the intervention group (carbohydrate 165 ± 7 compared with 190 ± 9 g, P = 0.04; energy 7040 ± 240 compared with 8230 ± 320 kJ, P <0.01, respectively). Only 20% of participants in the MLC group met the target intake compared with 65% in the RC group (P <0.01). There were no differences in birth weight, rate of large-for-gestational-age infants, percent fat mass, or fat-free mass between groups. CONCLUSIONS: An intervention to reduce carbohydrate intake in GDM did not raise ketones to clinical significance, possibly because the target of 135 g/d was difficult to achieve in pregnancy. Feeding studies with food provision may be needed to assess the benefits and risks of low-carbohydrate diets. This trial was registered at www.anzctr.org.au as ACTRN12616000018415.

    The formation of fat-derived flavour compounds during the ripening of Gouda-type cheese
    Alewijn, M. - \ 2006
    Wageningen University. Promotor(en): J.T.M. Wouters, co-promotor(en): E.L. Sliwinski. - Wageningen : - ISBN 9789085043812 - 136
    goudse kaas - geurstoffen en smaakstoffen - vetten - vetzuren - lactonen - esters - ketonen - kaasrijping - gouda cheese - flavour compounds - fats - fatty acids - lactones - esters - ketones - cheese ripening
    Cheese flavour is an important quality attribute, and is mainly formed during cheese ripening. Besides compounds that are formed from protein and carbohydrates, milk fat-derived compounds are essential for cheese flavour. Before, but mainly during ripening, free fatty acids, lactones, ketones, esters, alcohols and aldehydes can be formed from milk fat, compounds that all contribute their own special character to the final cheese flavour. The formation mechanisms that lead to these compounds are not completely understood, and therefore cheese flavour formation is not under full control.
    Comparison of gas-phase acidities of some carbon acids with their rates of hydron exchange in methanolic methoxide
    DeTuri, V.F. ; Koch, H.F. ; Koch, J.G. ; Lodder, G. ; Mishima, M. ; Zuilhof, H. ; Abrams, N.M. ; Anders, C.E. ; Biffinger, J.C. ; Han, P. ; Kurland, A.R. ; Nichols, J.M. ; Ruminski, A.M. ; Smith, P.R. ; Vasey, K.D.J. - \ 2006
    Journal of Physical Organic Chemistry 19 (2006)5. - ISSN 0894-3230 - p. 308 - 317.
    proton-transfer reactions - methanolic sodium methoxide - bronsted correlation - isotope exchange - hydrocarbons - mechanism - solvolysis - solvation - ketones - benzyl
    Hydron exchange reaction rates, k(exch)M(-1) s(-1), using methanolic sodium methoxide are compared with gas-phase acidities, Delta G(Acid)(0) kcal/mol, for four 9-YPhenylfluorenes-9-H-i, seven (YC6H4CH)-H-i(CF3)(2), seven YC6H4-(CHClCF3)-H-i, and (C6F5H)-H-i. Fourteen of the fluorinated benzylic compounds and pentafluorobenzene result in near unity experimental hydrogen isotope effects that suggest substantial amounts of internal return associated with the exchange process. Although the reactions of 9-phenylfluorene have experimental isotope effects that appear to be normal in value, they do not obey the Swain-Schaad relationship. This suggests that they occur with small amounts of internal return. The entropies of activation, Delta S-double dagger, are +12 to +14eu, for the benzylic compounds and different significantly from those for the 9-YPhenylfluorenes, Delta S-double dagger of -8 to - 12 eu. The Delta S-double dagger similar to 1 eu for the reactions of pentafluorobenzene falls between the other compounds. Density functional calculations using B3LYP/6-31+G(d,p) are reported for the reactions of CH3O-(HOCH3)(3) with C6F5H, C6H5CH(CF3)(2), C6H5CHClCF3, and 9-phenylfluorene. Copyright (c) 2006 John Wiley & Sons, Ltd.
    Stereoselectivity and substrate specificity in the kinetic resolution of methyl-substituted 1-oxaspiro[2.5]octanes by Rhodotorula glutinis epoxide hydrolase
    Weijers, C.A.G.M. ; Meeuwse, P. ; Herpers, R.L.J.M. ; Franssen, M.C.R. ; Sudhölter, E.J.R. - \ 2005
    Journal of Organic Chemistry 70 (2005)17. - ISSN 0022-3263 - p. 6639 - 6646.
    ylide-mediated epoxidation - methionine aminopeptidase - spectrophotometric assay - angiogenesis inhibitors - efficient synthesis - fumagillin analogs - terminal epoxides - hydrolysis - ketones - stereochemistry
    [GRAPHICS] The kinetic resolution of a range of methyl-substituted 1-oxaspiro[2.5]octanes by yeast epoxide hydrolase (YEH) from Rhodotorula glutinis has been investigated. The structural determinants of substrate specificity and stereoselectivity of YEH toward these substrates appeared to be the configuration of the epoxide ring and the substitution pattern of the cyclohexane ring. For all compounds tested, O-axial epoxides were hydrolyzed faster than the corresponding O-equatorial compounds. In concern of the ring substituents,.YEH preferred methyl groups on the Re side of the ring. Placement of substituents close to the spiroepoxide carbon decreased the reaction rate but increased enantioselectivity. YEH-catalyzed kinetic resolutions of 4-methyl 1-oxaspiro [2.5] octane epimers were most enantioselective,(E > 100).
    Qualitätsbestimmung bei Lagerkartoffeln
    Hak, P.S. ; Oosterhaven, J. - \ 1997
    Der Kartoffelbau 48 (1997)11. - ISSN 0022-9156 - p. 418 - 420.
    opslag - chemische samenstelling - planten - chemische analyse - koolhydraten - aldehyden - ketonen - zetmeel - cellulose - kwaliteit - prestatieniveau - fabrieksaardappelen - storage - chemical composition - plants - chemical analysis - carbohydrates - aldehydes - ketones - starch - quality - performance - starch potatoes
    Onderzoek naar oorzaken van veroudering bij het bewaren van fabrieksaardappelen. De balans tussen het zetmeel- en suikergehalte is een indicator voor de kwaliteit van frieten
    Enzymic modification of cellulose - xyloglucan networks : implications for fruit juice processing = Enzymatische modificatie van cellulose - xyloglucaan netwerken
    Vincken, J.P. - \ 1996
    Agricultural University. Promotor(en): A.G.J. Voragen; G. Beldman. - S.l. : Vincken - ISBN 9789054855101 - 159
    appels - malus - koolhydraten - aldehyden - ketonen - zetmeel - cellulose - apples - malus - carbohydrates - aldehydes - ketones - starch - cellulose

    Xyloglucans play an important role in connecting cellulose microfibrils in the primary coli wall of plants, and the resulting cellulose-xyloglucan network is thought to determine the strength of these walls. Xyloglucans were isolated from apple fruit and potato tuber cell wall material by alkaline extraction and their primary structures were determined. Major differences between these two polysaccharides were their degree of backbone branching and the presence of fucosyl and arabinosyl residues.

    The substrate specificity of three ondoglucanases from Trichoderma viride (endol, endolV and endoV) was investigated. The target substrate of endol is cellulose, that of endolV xyloglucan, whereas endoV is the most versatile endoglucanase having the ability of degrading both substrates. EndolV and endoV differ in their mode of action towards potato xyloglucan. Further, strong indications were obtained that xyloglucanase activity is related to a long array of substrate-binding sites.

    The degradation of the cellulose-xyloglucan network in isolated coli wall material from apple fruit involves several glucanase activities. Xyloglucanase activity is important to make cell wall embedded cellulose more accessible to true cellulolytic enzymes such as endol and cellobiohydrolase. Extensive degradation is required because xyloglucan fragments having a backbone of 20 glucosyl residues (five building units) still bind to cellulose surfaces. These results might explain why fungi excrete so many different kinds of endoglucanases.

    When the cell walls of living apple fruit tissue were treated with pectin lyase and a mixture of glucanases from Trichoderma viride (liquefaction), the ease with which the apple tissue disintegrated, seemed to depend on the maturity of the fruit. The disintegration of apple fruit tissue during liquefaction correlates to the level of (ripeningrelated) xyloglucan endotransglycosylase activity in apple fruit. An hypothesis for the synergism of fungal and plant glucanases is put forward. Under certain circumstances (controlled liquefaction) the cellulose-xyloglucan network can be modified in such a way, that a stable cellulose-based cloud is formed in the resulting apple juice. The significance of these observations for juice manufacturing is discussed.

    Opslag en benutting van niet-structurele koolhydraten in de vegetatieve delen tijdens bloei en zaadvulling bij zaadgewassen : een literatuur-orientatie
    Dijk, W. van - \ 1989
    Wageningen : CABO (CABO-verslag nr. 116) - 41
    aldehyden - koolhydraten - cellulose - distributie - formatie - ketonen - voedingsstoffenreserves - zaadzetting - zaden - zetmeel - aldehydes - carbohydrates - cellulose - distribution - formation - ketones - nutrient reserves - seed set - seeds - starch
    Literatuurstudie naar de bepaling van mono- en disacchariden en polyalcoholen met behulp van instrumentale analysemethoden
    Oostrom, J.J. van; Jong, J. de; Frankhuizen, R. - \ 1989
    Wageningen : RIKILT (Rapport / RIKILT 89.55) - 20
    voedingsmiddelen - voedselproducten - landbouwproducten - voedselkwaliteit - kwaliteitscontroles - derivaten - polyethyleenglycol - glycolen - ethyleenglycol - alcoholen - thiolen - koolhydraten - aldehyden - ketonen - zetmeel - cellulose - analyse - chemie - literatuuroverzichten - analytische scheikunde - foods - food products - agricultural products - food quality - quality controls - derivatives - polyethylene glycol - glycols - ethylene glycol - alcohols - thiols - carbohydrates - aldehydes - ketones - starch - cellulose - analysis - chemistry - literature reviews - analytical chemistry
    Doel van dit onderzoek was het uitvoeren van een literatuurstudie naar de bepalingsmogelijkheden van mono- en disacchariden en polyalcoholen met behulp van instrumentele analysemethoden.
    Hoe bepaal ik suikers in frites- en chipsaardappelen?
    Ludwig, J.W. - \ 1987
    Wageningen : I.B.V.L. (Publikatie / Instituut voor Bewaring en Verwerking van Landbouwprodukten 376)
    aldehyden - koolhydraten - cassave - cellulose - voedselbewaring - voedselkwaliteit - voedingsmiddelen - ketonen - aardappelen - kwaliteitscontroles - wortelgewassen als groente - zetmeel - aldehydes - carbohydrates - cassava - cellulose - food preservation - food quality - foods - ketones - potatoes - quality controls - root vegetables - starch
    De bepaling van reservekoolhydraten in grassen
    Vertregt, N. ; Verhagen, W. - \ 1979
    Wageningen : Centrum voor Agrobiologisch Onderzoek (CABO-verslag / Centrum voor Agrobiologisch Onderzoek no. 23) - 18
    aldehyden - analyse - plantkunde - koolhydraten - cellulose - chemie - ketonen - zetmeel - analytische scheikunde - voedergrassen - aldehydes - analysis - botany - carbohydrates - cellulose - chemistry - ketones - starch - analytical chemistry - fodder grasses
    The determination of sugars in potatoes as studied in a ring - analysis
    Vliet, W.F. van; Mueller, K. - \ 1970
    Wageningen : [s.n.] (Publikatie / Instituut voor bewaring en verwerking van landbouwprodukten no. 218) - 7
    aldehyden - analyse - plantkunde - koolhydraten - cellulose - chemie - ketonen - organische verbindingen - aardappelen - solanum tuberosum - zetmeel - analytische scheikunde - aldehydes - analysis - botany - carbohydrates - cellulose - chemistry - ketones - organic compounds - potatoes - solanum tuberosum - starch - analytical chemistry
    The determination of sugars in potatoes, studied in a ring - analysis
    Vliet, W.F. van - \ 1970
    Wageningen etc. : [s.n.] (Publikatie / Instituut voor bewaring en verwerking van landbouwproducten no. 224) - 2
    aldehyden - analyse - plantkunde - koolhydraten - cellulose - chemie - ketonen - organische verbindingen - aardappelen - solanum tuberosum - zetmeel - analytische scheikunde - aldehydes - analysis - botany - carbohydrates - cellulose - chemistry - ketones - organic compounds - potatoes - solanum tuberosum - starch - analytical chemistry
    De bepaling van pectine in aardappelen
    Schriemer, W. - \ 1961
    Wageningen : [s.n.] (Intern rapport / Instituut voor bewaring en verwerking van landbouwprodukten no. 116) - 19
    aldehyden - koolhydraten - cellulose - ketonen - pectinen - aardappelen - solanum tuberosum - zetmeel - aldehydes - carbohydrates - cellulose - ketones - pectins - potatoes - solanum tuberosum - starch
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