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Klughammer N, Barth A, Dekker M, Fragasso A, Onck PR, Dekker C. Diameter dependence of transport through nuclear pore complex mimics studied using optical nanopores. eLife 2024; 12:RP87174. [PMID: 38376900 PMCID: PMC10942607 DOI: 10.7554/elife.87174] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2024] Open
Abstract
The nuclear pore complex (NPC) regulates the selective transport of large biomolecules through the nuclear envelope. As a model system for nuclear transport, we construct NPC mimics by functionalizing the pore walls of freestanding palladium zero-mode waveguides with the FG-nucleoporin Nsp1. This approach enables the measurement of single-molecule translocations through individual pores using optical detection. We probe the selectivity of Nsp1-coated pores by quantitatively comparing the translocation rates of the nuclear transport receptor Kap95 to the inert probe BSA over a wide range of pore sizes from 35 nm to 160 nm. Pores below 55 ± 5 nm show significant selectivity that gradually decreases for larger pores. This finding is corroborated by coarse-grained molecular dynamics simulations of the Nsp1 mesh within the pore, which suggest that leakage of BSA occurs by diffusion through transient openings within the dynamic mesh. Furthermore, we experimentally observe a modulation of the BSA permeation when varying the concentration of Kap95. The results demonstrate the potential of single-molecule fluorescence measurements on biomimetic NPCs to elucidate the principles of nuclear transport.
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Affiliation(s)
- Nils Klughammer
- Department of Bionanoscience, Kavli Institute of Nanoscience, Delft University of TechnologyDelftNetherlands
| | - Anders Barth
- Department of Bionanoscience, Kavli Institute of Nanoscience, Delft University of TechnologyDelftNetherlands
| | - Maurice Dekker
- Zernike Institute for Advanced Materials, University of GroningenGroningenNetherlands
| | - Alessio Fragasso
- Department of Bionanoscience, Kavli Institute of Nanoscience, Delft University of TechnologyDelftNetherlands
| | - Patrick R Onck
- Zernike Institute for Advanced Materials, University of GroningenGroningenNetherlands
| | - Cees Dekker
- Department of Bionanoscience, Kavli Institute of Nanoscience, Delft University of TechnologyDelftNetherlands
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Paddick SM, Gamassa E, Mwaluwinga N, Lewis EG, Duinmaijer A, Urasa S, Tucker L, Mukaetova-Ladinska E, Cosker G, Dekker M, Kisoli A, Cletus J, Lissu C, Dotchin C, Gray W, Walker R. Preliminary evaluation of a smartphone application (DelApp) for identification of delirium in sub-Saharan Africa. Acta Neuropsychiatr 2023:1-28. [PMID: 37345466 DOI: 10.1017/neu.2023.29] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 06/23/2023]
Abstract
OBJECTIVE In sub-Saharan Africa (SSA), there are no validated screening tools for delirium in older adults, despite the known vulnerability of older people to delirium and the associated adverse outcomes. This study aimed to assess the effectiveness of a brief smartphone-based assessment of arousal and attention (DelApp) in identification of delirium amongst older adults admitted to the medical department of a tertiary referral hospital in Northern Tanzania. METHOD Consecutive admissions were screened using the DelApp during a larger study of delirium prevalence and risk factors. All participants subsequently underwent detailed clinical assessment for delirium by a research doctor. Delirium and dementia were identified against DSM-5 criteria by consensus. RESULTS Complete data for 66 individuals were collected of whom 15 (22.7%) had delirium, 24.5% had dementia without delirium and 10.6% delirium superimposed on dementia. Sensitivity and specificity of the DelApp for delirium were 0.87 and 0.62 respectively (AUROC 0.77) and 0.88 and 0.73 (AUROC 0.85) for major cognitive impairment (dementia and delirium combined). Lower DelApp score was associated with age, significant visual impairment (<6/60 acuity), illness severity, reduced arousal and DSM-5 delirium on univariable analysis, but on multivariable logistic regression only arousal remained significant. CONCLUSION In this setting, the DelApp performed well in identifying delirium and major cognitive impairment but did not differentiate delirium and dementia. Performance is likely to have been affected by confounders including uncorrected visual impairment and reduced level of arousal without delirium. Negative predictive value was nevertheless high, indicating excellent "rule out" value in this setting.
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Affiliation(s)
- S M Paddick
- Institute of Translational and Clinical Medicine, Newcastle University, Newcastle upon Tyne, UK
- Cumbria Northumberland Tyne and Wear NHS Foundation Trust, Newcastle upon Tyne, UK
| | - E Gamassa
- Kilimanjaro Christian Medical University College, Moshi, Tanzania
| | - N Mwaluwinga
- Kilimanjaro Christian Medical University College, Moshi, Tanzania
| | - E G Lewis
- Charité - Universitätsmedizin Berlin CVK: Campus Virchow-Klinikum Institute of Tropical Medicine and International Health, Berlin, Germany
| | - A Duinmaijer
- Haydom Lutheran Hospital, Mbulu, Manyara, Tanzania
| | - S Urasa
- Kilimanjaro Christian Medical University College, Moshi, Tanzania
| | - L Tucker
- The London School of Hygiene & Tropical Medicine, London, UK
| | | | - G Cosker
- Cumbria Northumberland Tyne and Wear NHS Foundation Trust, Newcastle upon Tyne, UK
| | - M Dekker
- Kilimanjaro Christian Medical University College, Moshi, Tanzania
| | - A Kisoli
- Kilimanjaro Christian Medical University College, Moshi, Tanzania
| | - J Cletus
- Hai District Hospital, Boman'gombe, Kilimanjaro, Tanzania
| | - C Lissu
- Kilimanjaro Christian Medical University College, Moshi, Tanzania
| | - C Dotchin
- Institute of Population Sciences, Newcastle University, Newcstle upon Tyne, UK
- Northumbria Healthcare NHS Foundation Trust, North Shields, UK
| | - W Gray
- Northumbria Healthcare NHS Foundation Trust, North Shields, UK
| | - R Walker
- Institute of Population Sciences, Newcastle University, Newcstle upon Tyne, UK
- Northumbria Healthcare NHS Foundation Trust, North Shields, UK
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Dekker M, Van der Giessen E, Onck PR. Phase separation of intrinsically disordered FG-Nups is driven by highly dynamic FG motifs. Proc Natl Acad Sci U S A 2023; 120:e2221804120. [PMID: 37307457 DOI: 10.1073/pnas.2221804120] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Accepted: 05/09/2023] [Indexed: 06/14/2023] Open
Abstract
The intrinsically disordered FG-Nups in the central channel of the nuclear pore complex (NPC) form a selective permeability barrier, allowing small molecules to traverse by passive diffusion, while large molecules can only translocate with the help of nuclear transport receptors. The exact phase state of the permeability barrier remains elusive. In vitro experiments have shown that some FG-Nups can undergo phase separation into condensates that display NPC-like permeability barrier properties. Here, we use molecular dynamics simulations at amino acid resolution to study the phase separation characteristics of each of the disordered FG-Nups of the yeast NPC. We find that GLFG-Nups undergo phase separation and reveal that the FG motifs act as highly dynamic hydrophobic stickers that are essential for the formation of FG-Nup condensates featuring droplet-spanning percolated networks. Additionally, we study phase separation in an FG-Nup mixture that resembles the NPC stoichiometry and observe that an NPC condensate is formed containing multiple GLFG-Nups. We find that the phase separation of this NPC condensate is also driven by FG-FG interactions, similar to the homotypic FG-Nup condensates. Based on the observed phase separation behavior, the different FG-Nups of the yeast NPC can be divided into two classes: The FG-Nups (mostly GLFG-type) located in the central channel of the NPC form a highly dynamic percolated network formed by many short-lived FG-FG interactions, while the peripheral FG-Nups (mostly FxFG-type) at the entry and exit of the NPC channel likely form an entropic brush.
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Affiliation(s)
- Maurice Dekker
- Zernike Institute for Advanced Materials, University of Groningen, 9747 AG, Groningen, The Netherlands
| | - Erik Van der Giessen
- Zernike Institute for Advanced Materials, University of Groningen, 9747 AG, Groningen, The Netherlands
| | - Patrick R Onck
- Zernike Institute for Advanced Materials, University of Groningen, 9747 AG, Groningen, The Netherlands
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4
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Verwer M, Waissi F, Mekke J, Dekker M, Stroes E, De Borst G, Kroon J, Hazenberg C, De Kleijn D. High lipoprotein(a) is associated with major adverse limb events after femoral artery endarterectomy. Atherosclerosis 2022. [DOI: 10.1016/j.atherosclerosis.2022.06.415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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van der Klok M, Dekker M, Van der Giessen E, Onck PR. A 4BPA Coarse-Grained Molecular Dynamics Study on the Aggregation of Polyglutamine. Biophys J 2021. [DOI: 10.1016/j.bpj.2020.11.428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Silvis MJM, Dekker M, Zivelonghi C, Agostoni P, Stella PR, Doevendans PA, de Kleijn DPV, van Kuijk JP, Leenders GE, Timmers L. The Coronary Sinus Reducer; 5-year Dutch experience. Neth Heart J 2020; 29:215-223. [PMID: 33284421 PMCID: PMC7991026 DOI: 10.1007/s12471-020-01525-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/10/2020] [Indexed: 11/29/2022] Open
Abstract
Background Refractory angina is a growing and major health-care problem affecting millions of patients with coronary artery disease worldwide. The Coronary Sinus Reducer (CSR) is a device that may be considered for the relief of symptoms of refractory angina. It causes increased venous pressure leading to a dilatation of arterioles and reduced arterial vascular resistance in the sub-endocardium. This study describes the 5‑year Dutch experience regarding safety and efficacy of the CSR. Methods One hundred and thirty-two patients with refractory angina were treated with the CSR. The primary efficacy endpoint of the study was Canadian Cardiovascular Society (CCS) class improvement between baseline and 6‑month follow-up. The primary safety endpoint was successful CSR implantation in the absence of any device-related events. Results Eighty-five patients (67%) showed improvement of at least 1 CCS class and 43 patients (34%) of at least 2 classes. Mean CCS class improved from 3.17 ± 0.61 to 2.12 ± 1.07 after implantation (P < 0.001). The CSR was successfully implanted in 99% of the patients and only minor complications during implantation were reported. Conclusion The CSR is a simple, safe, and effective option for most patients with refractory angina. However, approximately thirty percent of the patients showed no benefit after implantation. Future studies should focus on the exact underlying mechanisms of action and reasons for non-response to better identify patients that could benefit most from this therapy. Electronic supplementary material The online version of this article (10.1007/s12471-020-01525-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- M J M Silvis
- Department of Cardiology, University Medical Centre Utrecht, Utrecht, The Netherlands
| | - M Dekker
- Department of Vascular Surgery, University Medical Centre Utrecht, Utrecht, The Netherlands.,Department of Cardiology, Amsterdam UMC, University of Amsterdam, Amsterdam Cardiovascular Sciences, Amsterdam, The Netherlands
| | - C Zivelonghi
- Hart Centrum, Ziekenhuis Netwerk Antwerpen (ZNA) Middelheim, Antwerpen, Belgium
| | - P Agostoni
- Hart Centrum, Ziekenhuis Netwerk Antwerpen (ZNA) Middelheim, Antwerpen, Belgium
| | - P R Stella
- Department of Cardiology, University Medical Centre Utrecht, Utrecht, The Netherlands
| | - P A Doevendans
- Department of Cardiology, University Medical Centre Utrecht, Utrecht, The Netherlands.,Netherlands Heart Institute, Utrecht, The Netherlands.,Central Military Hospital, Utrecht, University Medical Center Utrecht, Utrecht, The Netherlands
| | - D P V de Kleijn
- Department of Vascular Surgery, University Medical Centre Utrecht, Utrecht, The Netherlands.,Netherlands Heart Institute, Utrecht, The Netherlands
| | - J P van Kuijk
- Department of Cardiology, St. Antonius Hospital Nieuwegein, Nieuwegein, The Netherlands
| | - G E Leenders
- Department of Cardiology, University Medical Centre Utrecht, Utrecht, The Netherlands
| | - L Timmers
- Department of Cardiology, St. Antonius Hospital Nieuwegein, Nieuwegein, The Netherlands.
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Waissi F, Timmerman N, Dekker M, Hoogeveen R, Schnitzler J, De Borst G, Stroes E, De Kleijn D, Kroon J. Elevated lipoprotein(a) levels increase risk of secondary major adverse cardiovascular events in patients undergoing carotid endarterectomy. Atherosclerosis 2020. [DOI: 10.1016/j.atherosclerosis.2020.10.449] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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8
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Caris M, Labuschagne H, Dekker M, Kramer M, van Agtmael M, Vandenbroucke-Grauls C. Nudging to improve hand hygiene. J Hosp Infect 2018; 98:352-358. [DOI: 10.1016/j.jhin.2017.09.023] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2017] [Accepted: 09/24/2017] [Indexed: 12/11/2022]
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de Wilde JA, Dekker M, Middelkoop BJC. BMI-for-age in South Asian children of 0-20 years in the Netherlands: secular changes and misclassification by WHO growth references. Ann Hum Biol 2018. [PMID: 29540065 DOI: 10.1080/03014460.2018.1445288] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
BACKGROUND South Asians are prone to cardiometabolic disease at lower BMI levels than most other ethnic groups, starting in childhood. The magnitude of BMI misclassifications is unknown. AIM To compare the BMI distribution of contemporary South Asian 0-20 year olds in the Netherlands with: (1) The South Asian norm reference (secular trends); and (2) The WHO child growth standard and reference. SUBJECTS AND METHODS The BMI-for-age distribution of 6677 routine measurements of 3322 South Asian children, aged 0-20 years, was described with the LMS method and BMI z-scores. RESULTS The BMI distribution in South Asian 0-4 year olds was almost similar to the norm reference (mean BMI z-score = 0.11, skewness = 0.31, SD = 1.0), whereas in 5-19 year olds the distribution had shifted upwards (mean = 0.53) and widened (skewness = -0.12, SD = 1.08). Overweight (incl. obesity) and obesity peaked at 8-10 years, at 45-48% and 35-37%, respectively. Relative to the WHO references, the BMI distribution was left-shifted at ages 0-4 years (mean BMI z-score = -0.46, skewness = 0.23, SD = 0.98) and widened at ages 5-20 years (mean = 0.05; skewness = -0.02, SD = 1.40). At most ages, thinness rates were significantly higher and obesity rates lower than based on South Asian norms. CONCLUSIONS A secular change of BMI-for-age in South Asian children mostly affected children >4 years. WHO references likely under-estimate overweight and obesity rates in South Asian children.
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Affiliation(s)
- J A de Wilde
- a Department of Public Health and Primary Care , Leiden University Medical Center , Leiden , the Netherlands.,b Department of Child Health , TNO , Leiden , the Netherlands
| | - M Dekker
- a Department of Public Health and Primary Care , Leiden University Medical Center , Leiden , the Netherlands
| | - B J C Middelkoop
- a Department of Public Health and Primary Care , Leiden University Medical Center , Leiden , the Netherlands.,c Department of Epidemiology , Community Health Service Haaglanden (GGD Haaglanden) , The Hague , the Netherlands
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10
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Sarvan I, Kramer E, Bouwmeester H, Dekker M, Verkerk R. Sulforaphane formation and bioaccessibility are more affected by steaming time than meal composition during in vitro digestion of broccoli. Food Chem 2016; 214:580-586. [PMID: 27507513 DOI: 10.1016/j.foodchem.2016.07.111] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2016] [Revised: 06/26/2016] [Accepted: 07/19/2016] [Indexed: 10/21/2022]
Abstract
Broccoli is a rich source of the glucosinolate glucoraphanin (GR). After hydrolysis of GR by the endogenous enzyme myrosinase, sulforaphane (SF) or sulforaphane nitrile (SFN) are produced, depending on environmental conditions. How the conversion of GR and bioaccessibility of released breakdown products are affected by steaming (raw, 1min, 2min and 3min steamed) and meal composition (protein or lipid addition) was studied with an in vitro digestion model (mouth, stomach, intestine, but not colonic digestion). The main formation of SF and SFN occurred during in vitro chewing. The contents of GR, SF and SFN did not change after further digestion, as the irreversible inactivated myrosinase under gastric conditions caused no further GR hydrolysis. SF concentrations were up to 10 times higher in raw and 1min steamed broccoli samples after digestion compared to longer-steamed broccoli. Protein or lipid addition had no influence on the formation and bioaccessibility of SF or SFN.
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Affiliation(s)
- I Sarvan
- Food Quality and Design Group, Wageningen University, Post Office Box 17, 6700 AA Wageningen, The Netherlands.
| | - E Kramer
- Rikilt-Wageningen University & Research Center, Akkermaalsbos 2, 6708 WB Wageningen, The Netherlands
| | - H Bouwmeester
- Rikilt-Wageningen University & Research Center, Akkermaalsbos 2, 6708 WB Wageningen, The Netherlands
| | - M Dekker
- Food Quality and Design Group, Wageningen University, Post Office Box 17, 6700 AA Wageningen, The Netherlands
| | - R Verkerk
- Food Quality and Design Group, Wageningen University, Post Office Box 17, 6700 AA Wageningen, The Netherlands
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11
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Affiliation(s)
- J. P. Bakker
- Vakgroep Plantenoecologie, Biologische Centrum; Rijksuniversiteit Groningen; Postbus 14 9750 AA Haren (Gn)
| | - M. Dekker
- Vakgroep Plantenoecologie, Biologische Centrum; Rijksuniversiteit Groningen; Postbus 14 9750 AA Haren (Gn)
| | - Y. De Vries
- Vakgroep Plantenoecologie, Biologische Centrum; Rijksuniversiteit Groningen; Postbus 14 9750 AA Haren (Gn)
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12
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Heising J, van Boekel M, Dekker M. Simulations on the prediction of cod (Gadus morhua) freshness from an intelligent packaging sensor concept. Food Packag Shelf Life 2015. [DOI: 10.1016/j.fpsl.2014.10.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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13
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Jin X, Oliviero T, van der Sman R, Verkerk R, Dekker M, van Boxtel A. Impact of different drying trajectories on degradation of nutritional compounds in broccoli (Brassica oleracea var. italica). Lebensm Wiss Technol 2014. [DOI: 10.1016/j.lwt.2014.05.031] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Hennig K, de Vos R, Maliepaard C, Dekker M, Verkerk R, Bonnema G. A metabolomics approach to identify factors influencing glucosinolate thermal degradation rates in Brassica vegetables. Food Chem 2014; 155:287-97. [DOI: 10.1016/j.foodchem.2014.01.062] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2013] [Revised: 10/06/2013] [Accepted: 01/21/2014] [Indexed: 12/19/2022]
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Bongoni R, Verkerk R, Dekker M, Steenbekkers LPA. Consumer behaviour towards vegetables: a study on domestic processing of broccoli and carrots by Dutch households. J Hum Nutr Diet 2014; 28:219-25. [PMID: 24916299 DOI: 10.1111/jhn.12245] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND Preferences for sensory properties (e.g. taste and texture) are assumed to control cooking behaviour with respect to vegetables. Conditions such as the cooking method, amount of water used and the time-temperature profile determine the nutritional quality (e.g. vitamins and phytochemicals) of cooked vegetables. Information on domestic processing and any underlying motives can be used to inform consumers about cooking vegetables that are equally liked and are nutrient-rich. METHODS Two online self-reporting questionnaires were used to identify domestic processing conditions of broccoli and carrots by Dutch households. Questions on various aspects of domestic processing and consumer motives were included. Descriptive data analysis and hierarchical cluster analysis were performed for both vegetables, separately, to group consumers with similar motives and behaviour towards vegetables. RESULTS Approximately 70% of consumers boiled vegetables, 8-9% steamed vegetables, 10-15% stir fried raw vegetables and 8-10% stir fried boiled vegetables. Mainly texture was used as a way to decide the 'doneness' of the vegetables. For both vegetables, three clusters of consumers were identified: texture-orientated, health-orientated, or taste-orientated. The texture-orientated consumers are identified as the most prevalent (56-59%) group in the present study. Statistically significant associations are found between domestic processing conditions and clusters, whereas no such association are found between demographic details and clusters. CONCLUSIONS A wide variation in domestic processing of broccoli and carrots is found in the present study. Mainly sensory properties (i.e. texture and taste) determined the domestic processing conditions. The findings of the present study can be used to optimise cooking to yield vegetables that meet consumer's specific sensory preference and are higher in nutrients, and as well as to communicate with target consumer groups.
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Affiliation(s)
- R Bongoni
- Food Quality and Design, Wageningen University, Wageningen, the Netherlands
| | - R Verkerk
- Food Quality and Design, Wageningen University, Wageningen, the Netherlands
| | - M Dekker
- Food Quality and Design, Wageningen University, Wageningen, the Netherlands
| | - L P A Steenbekkers
- Food Quality and Design, Wageningen University, Wageningen, the Netherlands
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16
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Silva E, Gerritsen L, Dekker M, van der Linden E, Scholten E. High amounts of broccoli in pasta-like products: nutritional evaluation and sensory acceptability. Food Funct 2014; 4:1700-8. [PMID: 24108199 DOI: 10.1039/c3fo00012e] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Pasta and noodles were enriched with concentrations of broccoli powder (BP) up to 30% (v/v). To ensure the benefits from the broccoli nutrients, their leakage during cooking should be prevented. Such leakage is determined by the microstructure. In a previous study we have shown that the microstructure can change dramatically in such broccoli-enriched products. In this article we investigated the amount of nutrients retained within the product. As a representative of nutrients we have chosen glucosinolates (GLs). Therefore, we have investigated the concentration of these phytochemicals in dried and cooked pasta and noodles. We have found that glucosinolates present in the pasta and noodles increase linearly with the volume fraction of BP up to 20%. At 30% BP the retained amount of GLs was equal to that of 20% BP and did not increase further. Therefore incorporation of 30% BP does not lead to additional health benefits over incorporation of 20% BP. We conclude that the nutritional function of our pasta-like products can be improved by enrichment up to 20% broccoli. This value is much higher than that found in common commercial products (which is a few percent). In this article we also briefly address the sensory acceptability of such products. Up to 20% broccoli the products turned out to remain acceptable. Combining this with our results on texture analysis we conclude that the GLs release, sensory acceptability and textural properties are related via the microstructure.
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Affiliation(s)
- E Silva
- Physics and Physical Chemistry of Foods, Wageningen University, Bornse Weilanden 9, 6708 WG Wageningen, The Netherlands.
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Oliviero T, Verkerk R, Van Boekel MAJS, Dekker M. Effect of water content and temperature on inactivation kinetics of myrosinase in broccoli (Brassica oleracea var. italica). Food Chem 2014; 163:197-201. [PMID: 24912716 DOI: 10.1016/j.foodchem.2014.04.099] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2013] [Revised: 03/11/2014] [Accepted: 04/25/2014] [Indexed: 10/25/2022]
Abstract
Broccoli belongs to the Brassicaceae plant family consisting of widely eaten vegetables containing high concentrations of glucosinolates. Enzymatic hydrolysis of glucosinolates by endogenous myrosinase (MYR) can form isothiocyanates with health-promoting activities. The effect of water content (WC) and temperature on MYR inactivation in broccoli was investigated. Broccoli was freeze dried obtaining batches with WC between 10% and 90% (aw from 0.10 to 0.96). These samples were incubated for various times at different temperatures (40-70°C) and MYR activity was measured. The initial MYR inactivation rates were estimated by the first-order reaction kinetic model. MYR inactivation rate constants were lower in the driest samples (10% WC) at all studied temperatures. Samples with 67% and 90% WC showed initial inactivation rate constants all in the same order of magnitude. Samples with 31% WC showed intermediate initial inactivation rate constants. These results are useful to optimise the conditions of drying processes to produce dried broccoli with optimal MYR retention for human health.
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Affiliation(s)
- T Oliviero
- Food Quality and Design Group, Wageningen University, Postbox 17/bode 30, 6700 AA Wageningen, The Netherlands.
| | - R Verkerk
- Food Quality and Design Group, Wageningen University, Postbox 17/bode 30, 6700 AA Wageningen, The Netherlands.
| | - M A J S Van Boekel
- Food Quality and Design Group, Wageningen University, Postbox 17/bode 30, 6700 AA Wageningen, The Netherlands.
| | - M Dekker
- Food Quality and Design Group, Wageningen University, Postbox 17/bode 30, 6700 AA Wageningen, The Netherlands.
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Chamney P, Moissl U, Wabel P, Amato C, Stuard S, Menzer M, Vollmeier C, Williams G, Shrivastava R, Chess J, Catling E, Brown C, Baker E, Ashcroft R, Mikhail A, Djukanovic L, Djuric Z, Knezevic V, Lazarevic T, Ljubenovic S, Markovic R, Rabrenovic V, Marinkovic J, Dimkovic N, Lebourg L, Ridel C, De Preneuf H, Le Roy F, Petitclerc T, Wester M, Simonis F, Kooman JP, Boer WH, Gerritsen KGF, Joles JA, Yamamoto KI, Eguchi K, Hirakawa S, Murakami J, Akiba T, Mineshima M, Stamopoulos D, Mpakirtzi N, Lavranos A, Panagiotou M, Barbarousi D, Matsouka C, Grapsa E, Abbas SR, Zhu F, Kaysen GA, Kotanko P, Levin NW, Vasilevsky A, Konoplev G, Stepanova O, Rubinsky A, Zemchenkov A, Gerasimchuk R, Frorip A, Abe T, Yamamoto KI, Ishimori I, Eguchi K, Murakami J, Mineshima M, Akiba T, Kusztal M, Go Biowski, T, Letachowicz K, Koni Ski P, Witkowski G, Pozna Ski P, Weyde W, Klinger M, Ito M, Ito S, Suzuki M, Masakane I, Navarro D, Goncalves C, Ferreira AC, Jorge C, Gil C, Aires I, Matias P, Mendes M, Azevedo A, Gomes F, Ferreira A, Perazzini C, Scutiero L, Brighenti L, Surace A, Steckiph D, Rovatti P, Severi S, Soltysiak J, Warzywoda A, Musielak A, Ostalska-Nowicka D, Zachwieja J, Goeksel T, Garnier H, Ritzerfeld M, Mann H, Babinet F, Allard B, Todorova V, Hamont C, Begri R, Dekker M, Taks M, Konings C, Scharnhorst V, Borawski J, Gozdzikiewicz-Lapinska J, Naumnik B, Lodi CA, Surace A, Grandi E, Rovatti P, Mancini E, Santoro A, Sereni L, Caiazzo M, Corazza L, Atti M, Palladino G, Sakurai K, Saito T, Hosoya H, Yamauchi F, Kurihara T, Tanibayashi Y, Ikebe N, Antonic M, Gubensek J, Drozg A, Vannier E, Mattio E, Todorova V, Ragon A, Brunet P, Klimm W, Pleskacz K, Pietrzak B, Niemczyk S, Leypoldt JK, Bernardo A, Muller M, Marbury TC, Culleton BF, Zeraati AA, Hekmat R, Reyhani HR, Sharifipoor F, Bolasco P, Sitzia I, Monni A, Mereu MC, Pinna AM, Logias F, Ghisu T, Passaghe M, Gazzanelli L, Ganadu M, Piras A, Cossu M, Contu B, Palleschi S, Rossi B, Atti M, Caiazzo M, Sereni L, Palladino G, Ghezzi PM, Kron S, Schneditz D, Leimbach T, Aign S, Kron J, Seker Kockara A, Kayatas M, Huzmeli C, Candan F, Yilmaz MB, Ahmed BA, Bejosano CN, Samra Abouchacra SA, Al Falahi SZ, Abdul Moniem KM, Dastoor H, Kim S, Oh J, Sin Y, Kim J, Lee J. HAEMODIALYSIS TECHNIQUES AND ADEQUACY 2. Nephrol Dial Transplant 2014. [DOI: 10.1093/ndt/gfu173] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Hennig K, Verkerk R, van Boekel M, Dekker M, Bonnema G. Food science meets plant science: A case study on improved nutritional quality by breeding for glucosinolate retention during food processing. Trends Food Sci Technol 2014. [DOI: 10.1016/j.tifs.2013.10.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Dekker M, Urasa S, Maro V, Kinabo G, Howlett W. Clinical hallmarks and epidemiology of stiff person syndrome in Tanzania. J Neurol Sci 2013. [DOI: 10.1016/j.jns.2013.07.397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Bongoni R, Steenbekkers L, Verkerk R, van Boekel M, Dekker M. Studying consumer behaviour related to the quality of food: A case on vegetable preparation affecting sensory and health attributes. Trends Food Sci Technol 2013. [DOI: 10.1016/j.tifs.2013.08.004] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Phan V, Ramaekers M, Bolhuis D, Garczarek U, van Boekel M, Dekker M. On the use of Bayesian networks to combine raw data from related studies on sensory satiation. Food Qual Prefer 2012. [DOI: 10.1016/j.foodqual.2012.04.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Hennig K, Verkerk R, Bonnema G, Dekker M. Pitfalls in the desulphation of glucosinolates in a high-throughput assay. Food Chem 2012; 134:2355-61. [PMID: 23442696 DOI: 10.1016/j.foodchem.2012.04.015] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2011] [Revised: 01/25/2012] [Accepted: 04/04/2012] [Indexed: 11/29/2022]
Abstract
Glucosinolates are phytochemicals with health promoting properties. Determination as desulpho-glucosinolates is widely used and a desulphation in microtiter plates has been applied to reach high throughput. The use of various sulphatase concentrations and volumes throughout literature necessitates the identification of an appropriate desulphation procedure in microtiter plates. High sulphatase concentrations (≥15 mg/ml) decreased the concentration of the internal standard glucotropaeolin, whereas the other glucosinolates were less affected. Due to the calculation based on the recovery of glucotropaeolin, this leads to an overestimation of GL concentrations after desulphation with high sulphatase concentrations. A glucosidase side-activity, present in the crude sulphatase powder, is likely causing this phenomenon. At lower sulphatase concentrations (1 mg/ml) glucoiberin and glucoraphanin were insufficiently desulphated. Combining these effects results in a small range of applicable sulphatase concentrations. A purified sulphatase preparation resulted in good recoveries for a diversity of samples and is hence recommended for high throughput desulphation in microtiter plates.
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Affiliation(s)
- K Hennig
- Product Design and Quality Management Group, Department of Agrotechnology and Food Sciences, Wageningen University, P.O. Box 8129, NL-6700 EV Wageningen, The Netherlands.
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Dekker M, Hoeksma AF, Dekker JHM, van Rossum MAJ, Dolman KM, Beckerman H, Roorda LD. Strong relationships between disease activity, foot-related impairments, activity limitations and participation restrictions in children with juvenile idiopathic arthritis. Clin Exp Rheumatol 2010; 28:905-911. [PMID: 21122275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2010] [Accepted: 06/30/2010] [Indexed: 05/30/2023]
Abstract
OBJECTIVES To assess possible relationships between disease activity, foot-related impairments, activity limitations and participation restrictions in children with juvenile idiopathic arthritis (JIA). METHODS Thirty-four children were studied. Disease activity was assessed with the Juvenile Arthritis Disease Activity Score in 71 joints (JADAS-71). Foot-related impairments, activity limitations and participation restrictions were measured with the Juvenile Arthritis Foot Disability Index (JAFI), the Childhood Health Assessment Questionnaire (CHAQ), self-reported or parent-reported and doctor-reported VAS scales. Relationships were quantified with Spearman's correlation coefficient. RESULTS The mean age was 12.4±3.7 years, the median disease duration 1.5 years (interquartile range (IQR) 1.0-4.0), 88% were girls, and 76% had polyarticular disease course. The median JADAS-71 score (range 0-101) was 6 (IQR 1-13). On the JAFI sub-scores (range 0-4) 88% of the children reported some foot-related impairments (median 1.1, IQR 0.4-2.0); 82% reported some foot-related activity limitations (median 0.9, IQR 0.3-2.0), and 65% reported some foot-related participation restrictions (median 0.6, IQR 0-2.1). The median CHAQ score was 0.9 (IQR 0.1-1.8). The JADAS-71 correlated with all impairment, activity limitation and participation restriction variables (r=0.48-0.81, p<0.01). Most of the impairment variables correlated with activity limitation (r=0.39, p<0.05 to r=0.92, p<0.01) and participation restriction variables (r=0.44, p<0.05 to r=0.81, p<0.01). All activity limitation variables correlated with participation restriction variables (r=0.62-0.84, p<0.01). CONCLUSIONS We observed strong relationships between disease activity, foot-related impairments, activity limitations and participation restrictions in children with JIA, and therefore suggest that standard screening for foot problems should be included in follow-up care for JIA patients.
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Affiliation(s)
- M Dekker
- Department of Rehabilitation Medicine, Centre for Rehabilitation and Rheumatology, Amsterdam, The Netherlands
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Bracco P, Kirschner A, Dekker M, Janssen D. Enzym-katalysierte, regioselektive Steroidhydroxylierungen. CHEM-ING-TECH 2010. [DOI: 10.1002/cite.201050219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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van Oostrom JCH, Dekker M, Willemsen ATM, de Jong BM, Roos RAC, Leenders KL. Changes in striatal dopamine D2 receptor binding in pre-clinical Huntington's disease. Eur J Neurol 2008; 16:226-31. [PMID: 19138335 DOI: 10.1111/j.1468-1331.2008.02390.x] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
BACKGROUND Carriers of the Huntington disease (HD) mutation develop a progressive neurodegenerative disorder after a pre-clinical phase. We examined the value of (11)C-raclopride PET (RAC) as a biomarker for pre-clinical HD pathophysiology. METHODS In a prospective cohort study with clinical and neuropsychological assessment we collected complete RAC data in 18 pre-clinical mutation carriers (HD-PMC) and 11 controls. Follow-up was 2 years. We calculated striatal RAC binding potential (BP) to measure dopamine D2 receptor availability. RESULTS No HD-PMC had overt neuropsychological dysfunction. RAC-BP in putamen was abnormal in up to 44% of HD-PMC. The rate of RAC-BP decline (2.6% per year) was not significantly higher than in controls. Follow-up putaminal BP correlated weakly with predicted distance to onset of clinical HD (P = 0.034), but the rate of decline did not. Three HD-PMC developed motor abnormalities suspect for HD but did not show an increased rate of decline of putaminal BP. CONCLUSIONS Many HD-PMC have striatal abnormalities but we found no clearly increased rate of D2 receptor changes around the onset of clinical HD. A longer follow-up of the present study cohort is needed to establish the value of RAC-BP in assessing the risk of clinical conversion from striatal D2 binding data.
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Affiliation(s)
- J C H van Oostrom
- Department of Neurology, University Medical Center Groningen, The University of Groningen, Groningen, The Netherlands.
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Stoffers NH, Brandsch R, Bradley EL, Cooper I, Dekker M, Störmer A, Franz R. Feasibility study for the development of certified reference materials for specific migration testing. Part 2: Estimation of diffusion parameters and comparison of experimental and predicted data. ACTA ACUST UNITED AC 2007; 22:173-84. [PMID: 15864868 DOI: 10.1080/02652030400028076] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
This paper describes the second part of a project whose main objective was to develop the know-how to produce certified reference materials (CRMs) for specific migration testing. Certification parameters discussed are the diffusion coefficient, D(P), the respective polymer-specific coefficient, A(P), of the migrant polymer combinations and the partitioning coefficient, K(P,F), describing the partitioning of the migrant between the polymer and a food simulant. The parameters were determined for 16 preliminary candidate CRMs. Each parameter was determined by one laboratory. The six materials most suitable as reference materials were selected and the parameters then determined by four laboratories. The coefficients resulting from this small-scale interlaboratory comparison study can be regarded as the most reliable values available to date. These coefficients were applied for a comparison of experimental and predicted migration data. The experimental migration data arose from the same project and were determined by one laboratory for the first 16 materials and subsequently by four laboratories for the six materials selected in the second phase. Overall, experimental and predicted migration data fit together quite well. Roughly half of the predicted data were within +/-10%; almost all predicted data were within +/-40% compared with the experimental data.
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Affiliation(s)
- N H Stoffers
- Fraunhofer Institute for Process Engineering and Packaging, Freising, Germany
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Dekker M, Brouwers C, Aarts M, van der Torre J, de Vries S, van de Vrugt H, te Riele H. Effective oligonucleotide-mediated gene disruption in ES cells lacking the mismatch repair protein MSH3. Gene Ther 2006; 13:686-94. [PMID: 16437133 DOI: 10.1038/sj.gt.3302689] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
We have previously demonstrated that site-specific insertion, deletion or substitution of one or two nucleotides in mouse embryonic stem cells (ES cells) by single-stranded deoxyribo-oligonucleotides is several hundred-fold suppressed by DNA mismatch repair (MMR) activity. Here, we have investigated whether compound mismatches and larger insertions escape detection by the MMR machinery and can be effectively introduced in MMR-proficient cells. We identified several compound mismatches that escaped detection by the MMR machinery to some extent, but could not define general rules predicting the efficacy of complex base-pair substitutions. In contrast, we found that four-nucleotide insertions were largely subject to suppression by the MSH2/MSH3 branch of MMR and could be effectively introduced in Msh3-deficient cells. As these cells have no overt mutator phenotype and Msh3-deficient mice do not develop cancer, Msh3-deficient ES cells can be used for oligonucleotide-mediated gene disruption. As an example, we present disruption of the Fanconi anemia gene Fancf.
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Affiliation(s)
- M Dekker
- Division of Molecular Biology, The Netherlands Cancer Institute, 1066 CX Amsterdam, The Netherlands
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Abstract
The migration of laurolactam and cyclic di- and trimer of nylon 12 was assessed using three different films and five food simulants (olive oil, isooctane, 95% ethanol, 50% ethanol, water). Substitute test conditions for migration into olive oil according to European Union Directive EC/97/48 were applied using 95% ethanol and isooctane. Results showed that 95% ethanol overestimated while isooctane underestimated the respective migration into olive oil. Water was the best olive oil substitute, as migration of laurolactam into water and olive oil using the same temperature gave similar results. Additionally, diffusion kinetics of laurolactam were investigated by migration kinetic studies using isooctane and olive oil. Diffusion coefficients determined with isooctane were significantly higher than those found using olive oil. It was proved that isooctane had an interaction and olive oil was inert to the polymer. The diffusion conductance parameter, A(p), for nylon 12 determined using olive oil ranged from 0.3 to 0.6.
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Affiliation(s)
- N H Stoffers
- Fraunhofer Institute for Process Engineering and Packaging, Freising, Germany.
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Helmroth IE, Dekker M, Hankemeier T. Additive diffusion from LDPE slabs into contacting solvents as a function of solvent absorption. J Appl Polym Sci 2003. [DOI: 10.1002/app.12802] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Dekker M, van Willige RWG, Linssen JPH, Voragen AGJ. Modelling the effect of oil/fat content in food systems on flavour absorption by LLDPE. Food Addit Contam 2003; 20:180-5. [PMID: 12623667 DOI: 10.1080/0265203021000042887] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
One of the phenomena in food-packaging interactions is flavour absorption. Absorption of flavour compounds from food products into food-packaging materials can result in loss of flavour compounds or an unbalance in the flavour profile changing a product's quality. The food matrix influences the amounts of absorbed flavour compounds; the presence of oil or fat especially determines the ability to absorb flavour compounds from the food to the package. On the other hand, the polarity of the flavour compound itself is a characteristic that also influences the level of absorption into synthetic polymers. A model based on the effect of the polarity (logP) of flavour compounds and on their partitioning coefficients between the food (matrix) and the packaging material is described. The model can be used for predicting absorption of flavour compounds from foods into LLDPE. However, an attempt to apply the proposed model on real foods shows serious limitations of the model for (very) low fat products. Predictive values deviate from the measured values, probably due to other interaction phenomena, e.g. with proteins. Predictive and measured values from a product with a substantial amount of fat match much better, suggesting that the model is valid for products having a substantial amount of (free) fat.
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Affiliation(s)
- M Dekker
- Product Design and Quality Management, Department of Agrotechnology and Food Sciences, Wageningen University, PO Box 8129, 6700 EV Wageningen, The Netherlands
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Helmroth IE, Bekhuis HAM, Linssen JPH, Dekker M. Direct measurement of additive migration from low-density polyethylene as a function of space and time. J Appl Polym Sci 2002. [DOI: 10.1002/app.11324] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Noordman T, de Jonge A, Wesselingh J, Bel W, Dekker M, Voorde E, Grijpma S. Application of fluidised particles as turbulence promoters in ultrafiltration. J Memb Sci 2002. [DOI: 10.1016/s0376-7388(02)00229-6] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Abstract
OBJECTIVE Strategies are available to reduce maternal-fetal transmission of HIV and depend on adequate prenatal screening. At present, a significant proportion of Canadian pregnant women remain unscreened. We reviewed our screening practices before and after the implementation of a departmental policy on universal counselling for HIV screening and the distribution of a patient educational brochure developed at our centre (interventions). METHODS Charts of all new antenatal patients seen during February-April in 1996 (n = 186) and 1998 (n = 212) were reviewed. Maternal demographics and evidence of HIV counselling and screening were collected and analyzed. RESULTS Following our interventions, HIV counselling and screening rates increased from 13% to 72%. Patient acceptance of testing was high. The majority of missed opportunities for HIV testing were patients transferred urgently from other institutions. CONCLUSION HIV counselling and screening can be improved by implementation of local strategies. We have demonstrated the feasibility of this approach in a tertiary care unit.
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Affiliation(s)
- A Gruslin
- Division Maternal-Fetal Medicine, Dept. Obstetrics/Gynecology and Newborn Care, Rm. 8420, Ottawa Hospital-General Campus, University of Ottawa, 501 Smyth Rd, Ottawa, ON K1H 8L6.
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Abstract
The effect of solvent absorption on additive migration was studied by relating the diffusion coefficient (D) of Irganox 1076 to the maximum solvent absorption of different solvents in low-density polyethylene (LDPE) film. Solvents tested were ethanol, isopropanol, isooctane, ethylacetate, cyclohexane, tributyrin, tricaprylin and olive oil. Diffusion and partition coefficients were determined by fitting the migration curves, i.e. the concentration of Irganox 1076 in solvent as a function of time, with Fick 's diffusion equation. The results for the low molecular weight solvents show that with increasing maximum solvent absorption, D of Irganox 1076 is increasing as well. This trend is not observedfor the two triglycerides and olive oil. In spite of absorption, no increase in D was observed. The obtained result is the basis of an extended predictive migration model that, besides migrant and polymer properties, is also based on the maximum solvent absorption in the polymer.
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Affiliation(s)
- I E Helmroth
- TNO Nutrition and Food Research, Packaging Research and Sensortechnology, Zeist, The Netherlands.
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van der Sluis AA, Dekker M, de Jager A, Jongen WM. Activity and concentration of polyphenolic antioxidants in apple: effect of cultivar, harvest year, and storage conditions. J Agric Food Chem 2001; 49:3606-13. [PMID: 11513636 DOI: 10.1021/jf001493u] [Citation(s) in RCA: 176] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Consumers' increasing interest in the relationship between diet and health is a sign for food producers to pay more attention to potential health-protecting compounds in new product development and food processing. From a production chain perspective the choice of the raw material that is used is important for the health-protecting potential of the end product. Four apple cultivars (Jonagold, Golden Delicious, Cox's Orange, and Elstar), which can be used as fresh apples or in processed apple products, were compared with regard to flavonol, catechins, phloridzin, and chlorogenic acid concentrations and antioxidant activity. Jonagold apples possessed the highest flavonoid concentration and the highest antioxidant activity. To study seasonal differences, apples from three different harvest years were analyzed, but in three cultivars no effect on flavonoid concentration and antioxidant activity was observed. Long-term storage, both at refrigerator temperature and under controlled atmosphere conditions, was found not to influence flavonoid concentration or antioxidant activity.
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Affiliation(s)
- A A van der Sluis
- Product Design and Quality Management Group, Department of Agrotechnology and Food Sciences, Wageningen University, P.O. Box 8129, 6700 EV Wageningen, The Netherlands
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te Riele H, Brouwers C, Dekker M. Generation of double-knockout embryonic stem cells. Methods Mol Biol 2001; 158:251-62. [PMID: 11236661 DOI: 10.1385/1-59259-220-1:251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Affiliation(s)
- H te Riele
- Division of Molecular Carcinogenesis, The Netherlands Cancer Institute, Amsterdam, The Netherlands
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Gruslin A, Salvador A, Dekker M, Menard-de Varennes D, Eason E. Prenatal HIV screening in a tertiary care centre. Can J Public Health 2001; 92:255-8. [PMID: 11962108 PMCID: PMC6979943] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 07/20/2000] [Accepted: 03/21/2001] [Indexed: 02/24/2023]
Abstract
OBJECTIVE Strategies are available to reduce maternal-fetal transmission of HIV and depend on adequate prenatal screening. At present, a significant proportion of Canadian pregnant women remain unscreened. We reviewed our screening practices before and after the implementation of a departmental policy on universal counselling for HIV screening and the distribution of a patient educational brochure developed at our centre (interventions). METHODS Charts of all new antenatal patients seen during February-April in 1996 (n = 186) and 1998 (n = 212) were reviewed. Maternal demographics and evidence of HIV counselling and screening were collected and analyzed. RESULTS Following our interventions, HIV counselling and screening rates increased from 13% to 72%. Patient acceptance of testing was high. The majority of missed opportunities for HIV testing were patients transferred urgently from other institutions. CONCLUSION HIV counselling and screening can be improved by implementation of local strategies. We have demonstrated the feasibility of this approach in a tertiary care unit.
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Affiliation(s)
- A Gruslin
- Division Maternal-Fetal Medicine, Dept. Obstetrics/Gynecology and Newborn Care, Rm. 8420, Ottawa Hospital-General Campus, University of Ottawa, 501 Smyth Rd, Ottawa, ON K1H 8L6.
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van der Sluis AA, Dekker M, Verkerk R, Jongen WM. An improved, rapid in vitro method to measure antioxidant activity. Application On selected flavonoids and apple juice. J Agric Food Chem 2000; 48:4116-4122. [PMID: 10995324 DOI: 10.1021/jf000156i] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A rapid in vitro method for measuring antioxidant activity is presented, which enables the evaluation of health claims and the optimization of product development with respect to health protecting compounds. Antioxidant activity is assessed in a system in which lipid peroxidation is induced in male rat liver microsomes by ascorbic acid and FeSO(4). This method has been significantly improved by enabling the use of microtiter plates and an ELISA reader. Large numbers of samples can be analyzed with good reproducibility, which is necessary when dealing with microsomes possessing biological variability. An objective mathematical procedure has been developed to translate data obtained from the lipid peroxidation assay into a value describing the antioxidant activity. As an illustration the method has been applied to measure antioxidant activity of individual flavonoids and apple juice.
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Affiliation(s)
- A A van der Sluis
- Integrated Food Technology Group, Department of Agrotechnology and Food Sciences, Wageningen University, P.O. Box 8129, 6700 EV Wageningen, The Netherlands
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Jansen L, Claij N, Dekker M, van Klink Y, van der Valk M, van 't Wout K, te Riele H. Acceleration of lymphomagenesis in mismatch-repair deficient mice by exposure to genotoxic agents. Toxicol Lett 2000; 112-113:245-50. [PMID: 10720738 DOI: 10.1016/s0378-4274(99)00277-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Hemizygosity for genes that are essential for DNA mismatch repair (MMR) was found to underlie cancer predisposition in hereditary nonpolypsis colorectal cancer (HNPCC). Loss of the wild-type allele generates a MMR-deficient cell compartment with a high propensity to oncogenic transformation. MMR deficiency not only accelerates spontaneous mutagenesis resulting from DNA replication errors, but also affects the cellular response to genotoxic agents. To study the consequences of MMR deficiency in vitro and to provide experimental access to HNPCC we have generated MMR-deficient cell lines and mice. The combination of MMR deficiency and exposure to genotoxic agents strongly accelerated lymphomagenesis.
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Affiliation(s)
- L Jansen
- The Netherlands Cancer Institute, Division of Molecular Carcinogenesis, Plesmanlaan 121, 1066 CX, Amsterdam, The Netherlands
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Sinninghe Damsté JS, Dekker M, van Dongen BE, Schouten S, Piersma T. Structural identification of the diester preen-gland waxes of the red knot (Calidris canutus). J Nat Prod 2000; 63:381-384. [PMID: 10757724 DOI: 10.1021/np990377m] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The intact C(32)-C(48) diester wax esters of the preen gland of the migrating bird Calidris canutus are shown, using synthesized standards, to comprise predominantly C(12)-C(16) alkane-1,2-diols esterified with octanoic, decanoic, and dodecanoic acid at one position, and with predominantly even-numbered carbon fatty acids at the other position.
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Affiliation(s)
- J S Sinninghe Damsté
- Department of Marine Biogeochemistry and Toxicology, Netherlands Institute for Sea Research, P.O. Box 59, 1790 AB Den Burg, The Netherlands.
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de Wind N, Dekker M, Claij N, Jansen L, van Klink Y, Radman M, Riggins G, van der Valk M, van't Wout K, te Riele H. HNPCC-like cancer predisposition in mice through simultaneous loss of Msh3 and Msh6 mismatch-repair protein functions. Nat Genet 1999; 23:359-62. [PMID: 10545954 DOI: 10.1038/15544] [Citation(s) in RCA: 153] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Cancer predisposition in hereditary non-polyposis colon cancer (HNPCC) is caused by defects in DNA mismatch repair (MMR). Mismatch recognition is attributed to two heterodimeric protein complexes: MutSalpha (refs 2, 3, 4, 5), a dimer of MutS homologues MSH2 and MSH6; and MutSbeta (refs 2,7), a dimer of MSH2 and MSH3. These complexes have specific and redundant mismatch recognition capacity. Whereas MSH2 deficiency ablates the activity of both dimers, causing strong cancer predisposition in mice and men, loss of MSH3 or MSH6 (also known as GTBP) function causes a partial MMR defect. This may explain the rarity of MSH6 and absence of MSH3 germline mutations in HNPCC families. To test this, we have inactivated the mouse genes Msh3 (formerly Rep3 ) and Msh6 (formerly Gtmbp). Msh6-deficient mice were prone to cancer; most animals developed lymphomas or epithelial tumours originating from the skin and uterus but only rarely from the intestine. Msh3 deficiency did not cause cancer predisposition, but in an Msh6 -deficient background, loss of Msh3 accelerated intestinal tumorigenesis. Lymphomagenesis was not affected. Furthermore, mismatch-directed anti-recombination and sensitivity to methylating agents required Msh2 and Msh6, but not Msh3. Thus, loss of MMR functions specific to Msh2/Msh6 is sufficient for lymphoma development in mice, whereas predisposition to intestinal cancer requires loss of function of both Msh2/Msh6 and Msh2/Msh3.
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Affiliation(s)
- N de Wind
- Division of Molecular Carcinogenesis, The Netherlands Cancer Institute, Amsterdam, The Netherlands
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Dekker M, Verkerk R, van der Sluis A, Khokhar S, Jongen W. Analysing the Antioxidant Activity of Food Products: Processing and Matrix Effects. Toxicol In Vitro 1999; 13:797-9. [DOI: 10.1016/s0887-2333(99)00057-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Toft NJ, Winton DJ, Kelly J, Howard LA, Dekker M, te Riele H, Arends MJ, Wyllie AH, Margison GP, Clarke AR. Msh2 status modulates both apoptosis and mutation frequency in the murine small intestine. Proc Natl Acad Sci U S A 1999; 96:3911-5. [PMID: 10097137 PMCID: PMC22394 DOI: 10.1073/pnas.96.7.3911] [Citation(s) in RCA: 124] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Deficiency in genes involved in DNA mismatch repair increases susceptibility to cancer, particularly of the colorectal epithelium. Using Msh2 null mice, we demonstrate that this genetic defect renders normal intestinal epithelial cells susceptible to mutation in vivo at the Dlb-1 locus. Compared with wild-type mice, Msh2-deficient animals had higher basal levels of mutation and were more sensitive to the mutagenic effects of temozolomide. Experiments using Msh2-deficient cells in vitro suggest that an element of this effect is attributable to increased clonogenicity. Indeed, we show that Msh2 plays a role in the in vivo initiation of apoptosis after treatment with temozolomide, N-methyl-N'-nitro-N-nitrosoguanidine, and cisplatin. This was not influenced by the in vivo depletion of O6-alkylguanine-DNA-alkyltransferase after administration of O6-benzylguanine. By analyzing mice mutant for both Msh2 and p53, we found that the Msh2-dependent apoptotic response was primarily mediated through a p53-dependent pathway. Msh2 also was required to signal delayed p53-independent death. Taken together, these studies characterize an in vivo Msh2-dependent apoptotic response to methylating agents and raise the possibility that Msh2 deficiency may predispose to malignancy not only through failed repair of mismatch DNA lesions but also through the failure to engage apoptosis.
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Affiliation(s)
- N J Toft
- Cancer Research Campaign Laboratories, Department of Pathology, University Medical School, Teviot Place, Edinburgh, EH8 9AG, United Kingdom
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