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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Tracking pan-continental trends in environmental contamination using sentinel raptors—what types of samples should we use?
Espín, S. ; García-Fernández, A.J. ; Herzke, D. ; Shore, R.F. ; Hattum, B. van; Martínez-López, E. ; Coeurdassier, M. ; Eulaers, I. ; Fritsch, C. ; Gómez-Ramírez, P. ; Jaspers, V.L.B. ; Krone, O. ; Duke, G. ; Helander, B. ; Mateo, R. ; Movalli, P. ; Sonne, C. ; Den Brink, N.W. van - \ 2016
Ecotoxicology (2016). - ISSN 0963-9292 - p. 777 - 801.
Bird of prey - Contaminant - Matrix - Monitoring - Sample type

Biomonitoring using birds of prey as sentinel species has been mooted as a way to evaluate the success of European Union directives that are designed to protect people and the environment across Europe from industrial contaminants and pesticides. No such pan-European evaluation currently exists. Coordination of such large scale monitoring would require harmonisation across multiple countries of the types of samples collected and analysed-matrices vary in the ease with which they can be collected and the information they provide. We report the first ever pan-European assessment of which raptor samples are collected across Europe and review their suitability for biomonitoring. Currently, some 182 monitoring programmes across 33 European countries collect a variety of raptor samples, and we discuss the relative merits of each for monitoring current priority and emerging compounds. Of the matrices collected, blood and liver are used most extensively for quantifying trends in recent and longer-term contaminant exposure, respectively. These matrices are potentially the most effective for pan-European biomonitoring but are not so widely and frequently collected as others. We found that failed eggs and feathers are the most widely collected samples. Because of this ubiquity, they may provide the best opportunities for widescale biomonitoring, although neither is suitable for all compounds. We advocate piloting pan-European monitoring of selected priority compounds using these matrices and developing read-across approaches to accommodate any effects that trophic pathway and species differences in accumulation may have on our ability to track environmental trends in contaminants.

An overview of existing raptor contaminant monitoring activities in Europe
Gomez-Ramirez, P. ; Shore, R.F. ; Brink, N.W. van den; Hattum, B. van; Bustnes, J.O. ; Duke, G. ; Fritsch, C. ; Garcia-Fernandez, A.J. ; Helander, B.O. ; Jaspers, V. ; Krone, O. ; Martinez-Lopez, E. ; Mateo, R. ; Movalli, P. ; Sonne, C. - \ 2014
Environment International 67 (2014). - ISSN 0160-4120 - p. 12 - 21.
brominated flame retardants - eagles haliaeetus-albicilla - kestrel falco-tinnunculus - white-tailed eagles - long-term trends - environmental contaminants - organochlorine pesticides - southeastern spain - accipiter-gentilis - biomonitoring tool
Biomonitoring using raptors as sentinels can provide early warning of the potential impacts of contaminants on humans and the environment and also a means of tracking the success of associated mitigation measures. Examples include detection of heavy metal-induced immune system impairment, PCB-induced altered reproductive impacts, and toxicity associated with lead in shot game. Authorisation of such releases and implementation of mitigation is now increasingly delivered through EU-wide directives but there is little established pan-European monitoring to quantify outcomes. We investigated the potential for EU-wide coordinated contaminant monitoring using raptors as sentinels. We did this using a questionnaire to ascertain the current scale of national activity across 44 European countries. According to this survey, there have been 52 different contaminant monitoring schemes with raptors over the last 50 years. There were active schemes in 15 (predominantly western European) countries and 23 schemes have been running for > 20 years; most monitoring was conducted for > 5 years. Legacy persistent organic compounds (specifically organochlorine insecticides and PCBs), and metals/metalloids were monitored in most of the 15 countries. Fungicides, flame retardants and anticoagulant rodenticides were also relatively frequently monitored (each in at least 6 countries). Common buzzard (Buteo buteo), common kestrel (Falco tinnunculus), golden eagle (Aquila chrysaetos), white-tailed sea eagle (Haliaeetus albicilla), peregrine falcon (Falco peregrinus), tawny owl (Strix aluco) and barn owl (Tyto alba) were most commonly monitored (each in 6–10 countries). Feathers and eggs were most widely analysed although many schemes also analysed body tissues. Our study reveals an existing capability across multiple European countries for contaminant monitoring using raptors. However, coordination between existing schemes and expansion of monitoring into Eastern Europe is needed. This would enable assessment of the appropriateness of the EU-regulation of substances that are hazardous to humans and the environment, the effectiveness of EU level mitigation policies, and identify pan-European spatial and temporal trends in current and emerging contaminants of concern.
Moderate alcohol consumption and lipoprotein-associated phospholipase A2 activity
Beulens, J.W.J. ; Berg, R. van den; Kok, F.J. ; Helander, A. ; Vermunt, S.H.F. ; Hendriks, H.F.J. - \ 2008
Nutrition, Metabolism & Cardiovascular Diseases 18 (2008)8. - ISSN 0939-4753 - p. 539 - 544.
gamma-glutamyl-transferase - coronary-heart-disease - c-reactive protein - middle-aged men - postmenopausal women - risk-factors - randomized intervention - cardiovascular-disease - insulin sensitivity - serum paraoxonase
Background and aims To investigate the effect of moderate alcohol consumption on lipoprotein-associated phospholipase A2 activity, markers of inflammation and oxidative stress and whether these effects are modified by BMI. Methods and results Eleven lean (BMI: 18.5¿25 kg/m2) and 9 overweight (BMI > 27 kg/m2) men participated in a randomized controlled crossover trial. After consuming 3 cans of beer (40 g ethanol) or alcohol-free beer daily during 3 weeks, fasting blood samples were taken. HDL cholesterol increased by 18.2% (p <0.001) after beer compared to alcohol-free beer, while LDL cholesterol decreased by 7.8% (p = 0.008). Lipoprotein-associated phospholipase A2 activity was not different (p = 0.23) between beer (47.5 ± 0.8) and alcohol-free beer (48.9 ± 0.8). High-sensitive C-reactive protein was unaffected, but urinary isoprostanes tended to increase (p = 0.09) after beer (114.0 ± 6.9) compared to alcohol-free beer (96.9 ± 6.5). An interaction between BMI and treatment (p <0.05) on liver enzymes was observed, indicating an increase of liver enzymes after moderate alcohol consumption in overweight men only. Conclusion Despite profound effects on HDL and LDL cholesterol, moderate alcohol consumption did not affect lipoprotein-associated phospholipase A2 activity. Liver enzymes increased after alcohol consumption in overweight men only, suggesting a less favorable response to moderate alcohol consumption in overweight people.
The effect of moderate alcohol consumption on adiponectin oligomers and muscle oxidative capacity: a human intervention study
Beulens, J.W.J. ; Loon, L.J.C. van; Kok, F.J. ; Pelsers, M. ; Bobbert, T. ; Spranger, J. ; Helander, A. ; Hendriks, H.F.J. - \ 2007
Diabetologia 50 (2007)7. - ISSN 0012-186X - p. 1388 - 1392.
insulin sensitivity - resistance
Aims/hypothesis The aim of this study was to investigate whether moderate alcohol consumption increases plasma high molecular weight (HMW) adiponectin and/or muscle oxidative capacity. Materials and methods Eleven lean (BMI 18 - 25 kg/m(2)) and eight overweight ( BMI >= 27 kg/m(2)) men consumed 100 ml whisky (similar to 32 g alcohol) or water daily for 4 weeks in a randomised, controlled, crossover trial. After each treatment period, muscle biopsies and fasting blood samples were collected. Results Adiponectin concentrations increased ( p <0.001) by 12.5% after 4 weeks of moderate alcohol consumption. Moderate alcohol consumption tended to increase HMW adiponectin by 57% ( p= 0.07) and medium molecular weight adiponectin by 12.5% ( p= 0.07), but not low molecular weight (LMW) adiponectin. Skeletal muscle citrate synthase, cytochrome c oxidase and beta-3-hydroxyacyl coenzyme A dehydrogenase (beta-HAD) activity were not changed after moderate alcohol consumption, but an interaction between alcohol consumption and BMI was observed for cytochrome c oxidase ( p= 0.072) and citrate synthase ( p= 0.102) activity. Among lean men, moderate alcohol consumption tended to increase cytochrome c oxidase ( p= 0.08) and citrate synthase activity ( p= 0.12) by 23 and 26%, respectively, but not among overweight men. In particular, plasma HMW adiponectin correlated positively with activities of skeletal muscle citrate synthase ( r= 0.64, p= 0.009), cytochrome c oxidase ( p= 0.59, p= 0.009) and beta-HAD ( r= 0.46, p= 0.056), while such correlation was not present for LMW adiponectin. Whole-body insulin sensitivity and intramyocellular triacylglycerol content were not affected by moderate alcohol consumption. Conclusions/interpretation Moderate alcohol consumption increases adiponectin concentrations, and in particular HMW adiponectin. Concentrations of HMW adiponectin in particular were positively associated with skeletal muscle oxidative capacity.
Optothermistor as a breakthrough in the quantification of lycopene content of thermally processed tomato-based foods: verification versus absorption spectrophotometry and high-performance liquid chromatography
Bicanic, D.D. ; Swarts, J.J. ; Luterotti, S. ; Helander, P. ; Fogliano, V. ; Enese, M. - \ 2005
Journal of Agricultural and Food Chemistry 53 (2005)9. - ISSN 0021-8561 - p. 3295 - 3299.
products - accurate - paste
This study reports on the first use of the "optothermistor" as a novel, precise, fast, and low-cost detector of lycopene in a wide range of commercially available processed-tomato products. The quantitative performance of the new device was evaluated by comparing data obtained to that acquired by conventional methods, namely, absorption spectrophotometry and high-performance liquid chromatography (HPLC); the linear correlation was high (R = 0.98). The variation of data obtained with the optothermistor in a series of consecutive measurements performed with the same loading of the sample was better than 1%. However, the repeatability (RSD 0.5-9.0%, n = 3-5) achieved with the optothermistor by independent analyses (multiple loading) is comparable to that of HPLC and spectrophotometry. Results of the studies performed on the 19 products derived from tomatoes demonstrated that the optothermistor is suitable for selective, accurate, precise, and simple determination of lycopene (range = 7-75 mg/100 g of product weight) without the need for a sample pretreatment step. The estimated sensitivity of the present optothermistor is 2 mg of lycopene/100 g of product
Characterization of the action of selected essential oil components on Gram-negative bacteria
Helander, I.M. ; Alakomi, H.L. ; Latva-Kala, K. ; Mattila-Sandholm, T. ; Pol, I. ; Smid, E.J. ; Gorris, L.G.M. ; Wright, A. von - \ 1998
Journal of Agricultural and Food Chemistry 46 (1998). - ISSN 0021-8561 - p. 3590 - 3595.
CO2 laser infrared optothermal spectroscopy for quantitative adulteration: studies in binary mixtures of extra-virgin olive oil.
Favier, J.P. ; Bicanic, D. ; Cozijnsen, J. ; Veldhuizen, B. van; Helander, P. - \ 1998
Journal of the American Oil Chemists Society 75 (1998). - ISSN 0003-021X - p. 359 - 362.
The Optothermal Approach to a Real Time Monitoring of Glucose Content During Fermentation by Brewers Yeast.
Favier, J.P. ; Bicanic, D. ; Helander, P. ; Iersel, M. van - \ 1997
Journal of Biochemical and Biophysical Methods 34 (1997). - ISSN 0165-022X - p. 205 - 211.
Optothermal Detection of Infrared Radiation Induced Absorption in Aqueous Solution of Carbohydrates: Lactose and Starch.
Favier, J.P. ; Bicanic, D. ; Doka, O. ; Chirtoc, M. ; Helander, P. - \ 1997
Journal of Agricultural and Food Chemistry 45 (1997). - ISSN 0021-8561 - p. 777 - 780.
Applications of a universal optothermal window detector for samples of agricultural purpose.
Favier, J.P. ; Iersel, M. van; Dóka, O. ; Koenderman, I. ; Schouten, F. ; Asselt, K. van; Bicanic, D. ; Helander, P. - \ 1996
Progress in Natural Science 6 (1996)SPEC. ISS.. - ISSN 1002-0071 - p. S562 - S565.
The optothermal window (OW) described here is a practical and easy to use sensor that enables one to calculate the optical absorption coefficient of fluid and semi fluid samples from the measured optothermal signal. The potential of this new and universal device is demonstrated in studies on liquids and gels of agricultural interest.
Detection of total trans fatty acids content in margarine: an intercomparison study of GLC, GLC+TLC, FT-IR and optothermal window (open photoacoustic cell).
Favier, J.P. ; Bicanic, D. ; Bovenkamp, P. van de; Chirtoc, M. ; Helander, P. - \ 1996
Analytical Chemistry 68 (1996). - ISSN 0003-2700 - p. 729 - 733.
Compact, open and general purpose cell of variable effective path length: direct absorption measurement of SO4 ~ in water.
Favier, J.P. ; Bicanic, D. ; Chirtoc, M. ; Helander, P. - \ 1996
Fresenius' journal of analytical chemistry 355 (1996). - ISSN 0937-0633 - p. 357 - 358.
Photothermal determination of absorption coefficients in optically dense fluids: application to oleic acid and water at CO laser wavelengths.
Bicanic, D. ; Chirtoc, M. ; Chirtoc, I. ; Helander, P. ; Favier, J.P. - \ 1995
Applied Spectroscopy 49 (1995)10. - ISSN 0003-7028 - p. 1485 - 1489.
New technique for measuring absorption coefficients of strongly absorbing liquids: optothermal study of oleic acid and its chloroform solutions at 3.39 Microns.
Bicanic, D. ; Chirtoc, M. ; Helander, P. ; Favier, J.P. - \ 1995
Spectroscopy letters 28 (1995). - ISSN 0038-7010 - p. 101 - 110.
New approach in determining absorption coefficients of strongly absorbing liquids: optothermal studies on sunflower oil, oleic acid (and its chloroform solutions) at 3.39 microns.
Bicanic, D. ; Chirtoc, M. ; Veldhuizen, B. van; Favier, J.P. ; Helander, P. ; Harryvan, J. ; Cozijnsen, J. ; Lubbers, M. - \ 1994
Journal de Physique IV France 4 (1994). - ISSN 1155-4339 - p. 487 - 490.
Optothermal measurement of absolute absorption coefficients of neat oleic acid and its solutions at infrared frequencies of C-H and C=O stretch vibrations.
Bicanic, D. ; Chirtoc, M. ; Chirtoc, I. ; Bovenkamp, P. ; Harryvan, H. ; Helander, P. - \ 1994
In: Abstracts 8th Int. Topical Meeting on Photoacoustic and photothermal phenomena. Pointe-a-Pitre, Guadeloupe, Fr. - p. 339 - 340.
Optothermal measurement of absolute absorption coefficients of neat oleic acid and its solutions at infrared frequencies of C-H and C=O stretch vibrations.
Bicanic, D. ; Chirtoc, M. ; Chirtoc, I. ; Bovenkamp, P. ; Harryvan, H. ; Helander, P. - \ 1993
In: Abstract 2nd UNESCO/ICTP/IAEC Int. Workshop Physics and modern applications of lasers. Dept. Physics, Univ. Zimbabwe, Harare (1993) Techn. Digest 38-39
Interfacing photoacoustic and photothermal techniques for new hyphenated methodologies and instrumentation suitable for agricultural, environmental and medical applications.
Bicanic, D. ; Jalink, H. ; Chirtoc, M. ; Sauren, H. ; Lubbers, M. ; Quist, J. ; Gerkema, E. ; Asselt, K. van; Miklos, A. ; Solyom, A. ; Angeli, Gy.Z. ; Helander, P. ; Vargas, H. - \ 1992
In: Photoacoustic and photothermal phenomena 3 / Bicanic, D., Heidelberg/Berlin : Springer Verlag (Springer Series in Optical Sciences 69) - p. 20 - 27.
Alcohol consumption and synthesis of ethyl esters of fatty acids in adipose tissue.
Björntorp, P. ; Depergola, G. ; Sjöberg, C. ; Pettersson, P. ; Hallgren, P. ; Boström, K. ; Helander, K.G. ; Seidell, J.C. - \ 1990
Journal of Internal Medicine 228 (1990). - ISSN 0954-6820 - p. 557 - 562.
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