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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Analysis of pesticide residues in strawberries and soils by GC-MS/MS, LC-MS/MS and two-dimensional GC– time-of-flight MS comparing organic and integrated pest management farming
Fernandes, V.C. ; Lehotay, S.J. ; Geis-Asteggiantec, L. ; Kwon, H. ; Mol, J.G.J. ; Kamp, H.J. van der; Mateus, N. ; Domingues, V.F. ; Delerue-Matos, C. - \ 2014
Food Additives & Contaminants. Pt. A, Chemistry, Analysis, Control, Exposure & Risk Assessment 31 (2014)2. - ISSN 1944-0049 - p. 262 - 270.
pressure gas-chromatography - tandem mass-spectrometry - performance liquid-chromatography - quechers sample preparation - qualitative aspects - multiresidue method - vegetables - fruits - extraction - foods
In this study, we analyzed 22 strawberry and soil samples after their collection over the course of 2 years to compare the residue profiles from organic farming to integrated pest management practices in Portugal. For sample preparation, we used the citrate-buffered version of the quick, easy, cheap, effective, rugged, and safe (QuEChERS) method. We applied three different methods for analysis: (i) 27 pesticides were targeted using LC-MS/MS; (ii) 143 were targeted using low pressure GC - tandem mass spectrometry (LP-GC-MS/MS); and (iii) More than > 600 pesticides were screened in a targeted and untargeted approach using comprehensive, two-dimensional gas chromatography time-of-flight mass spectrometry (GC × GC-TOF-MS). Comparison was made of the analyses using the different methods for the shared samples. The results were similar, thereby providing satisfactory confirmation of both similarly positive and negative findings. No pesticides were found in the organic-farmed samples. In samples from integrated pest management practices, 9 pesticides were determined and confirmed to be present ranging from 2 µg kg-1 for fluazifop-p-butyl to 50 µg kg-1 for fenpropathrin. Concentrations of residues in strawberries were less than European maximum residue limits.
metAlignID: A high-throughout sofware tool set for automated detection of trace level contaminants in comprehensive LECO two-dimensional gas chromatography time-of-flight mass spectrometry data
Lommen, A. ; Kamp, H.J. van der; Kools, H.J. ; Lee, M.K. van der; Weg, G. van der - \ 2012
Journal of Chromatography. A, Including electrophoresis and other separation methods 1263 (2012). - ISSN 0021-9673 - p. 169 - 178.
pesticides - separation - extraction - residues - fish
A new alternative data processing tool set, metAlignID, is developed for automated pre-processing and library-based identification and concentration estimation of target compounds after analysis by comprehensive two-dimensional gas chromatography with mass spectrometric detection. The tool set has been developed for and tested on LECO data. The software is developed to run multi-threaded (one thread per processor core) on a standard PC (personal computer) under different operating systems and is as such capable of processing multiple data sets simultaneously. Raw data files are converted into netCDF (network Common Data Form) format using a fast conversion tool. They are then preprocessed using previously developed algorithms originating from metAlign software. Next, the resulting reduced data files are searched against a user-composed library (derived from user or commercial NIST-compatible libraries) (NIST = National Institute of Standards and Technology) and the identified compounds, including an indicative concentration, are reported in Excel format. Data can be processed batch wise. The overall time needed for conversion together with processing and searching of 30 raw data sets for 560 compounds is routinely within an hour. The screening performance is evaluated for detection of pesticides and contaminants in raw data obtained after analysis of soil and plant samples. Results are compared to the existing data-handling routine based on proprietary software (LECO, ChromaTOF). The developed software tool set, which is freely downloadable at www.metalign.nl, greatly accelerates data-analysis and offers more options for fine-tuning automated identification toward specific application needs. The quality of the results obtained is slightly better than the standard processing and also adds a quantitative estimate. The software tool set in combination with two-dimensional gas chromatography coupled to time-of-flight mass spectrometry shows great potential as a highly-automated and fast multi-residue instrumental screening method.
Validation of automated Library-Based Qualitative Screening of Pesticides by Comprehensive Two-Dimensional Gas Chromatography/Time-of-Flight Mass Spectrometry
Mol, J.G.J. ; Kamp, H.J. van der; Weg, G. van der; Lee, M.K. van der; Punt, A.M. ; Rijk, T.C. de - \ 2011
Journal of AOAC International 94 (2011)6. - ISSN 1060-3271 - p. 1722 - 1740.
large-volume injection - spectral deconvolution - residue analysis - identification system - organic contaminants - time - vegetables - fruits - target - optimization
A method for automated detection and reporting of pesticides in plant materials based on comprehensive two-dimensional GC/time-of-flight MS with library-based detection by software has been developed and validated. Optimum settings for detection parameters such as spectral match threshold and first and second dimension retention time tolerances were assessed with respect to occurrence of false detects and false negatives. Next the method was validated following European Union guidelines established for qualitative screening of pesticides. The validation was largely done in retrospect by using data obtained for spiked samples (235 pesticides, various crops, 0.01-0.2 mg/kg) that had been analyzed previously with routine samples over a period of 18 months. At 0.01 mg/kg, the required 95% confidence level (
Qualitative Aspects in the Analysis of Pesticide Residues in Fruits and Vegetables Using Fast, Low -Pressure Gas Chromatography-Time-of-Flight Mass Spectrometry
Lehotay, S.J. ; Koesukwiwat, U. ; Kamp, H.J. van der; Mol, J.G.J. ; Leepipatpiboon, N. - \ 2011
Journal of Agricultural and Food Chemistry 59 (2011)14. - ISSN 0021-8561 - p. 7544 - 7556.
gc-ms - spectral deconvolution - identification system - multiresidue method - quechers - confirmation - extraction - food
Quantitative method validation is a well-established process to demonstrate trueness and precision of the results with a given method. However, an assessment of qualitative results is also an important need to estimate selectivity and devise criteria for chemical identification when using the method, particularly for mass spectrometric analysis. For multianalyte analysis, automatic instrument software is commonly used to make initial qualitative identifications of the target analytes by comparison of their mass spectra against a database library. Especially at low residue levels in complex matrices, manual checking of results is typically needed to correct the peak assignments and integration errors, which is very time-consuming. Low-pressure gas chromatography-mass spectrometry (LP-GC-MS) has been demonstrated to increase the speed of analysis for GC-amenable residues in various foods and provide more advantages over the traditional GC-MS approach. LP-GC-MS on a time-of-flight (ToF) instrument was used, which provided high sample throughput with
Monitoring results for pesticide residues in feed and feed ingredients
Rijk, T.C. de; Punt, A.M. ; Kamp, H.J. van der; Zomer, P. ; Mol, J.G.J. ; Egmond, H.J. van; Jong, J. de; Schee, H. van der - \ 2011
Verification of the identity of fats and oils
Ruth, S.M. van; Akkermans, L.M.W. ; Rozijn, M. ; Koot, A.H. ; Kamp, H.J. van der; Tres, A. ; Alewijn, M. - \ 2011
Verification of the identity of organic feed by fatty acid fingerprinting
Tres, A. ; Rozijn, M. ; Kamp, H.J. van der; Alewijn, M. ; Ruth, S.M. van - \ 2011
Authentication of feeding fats: Classification of animal fats, fish oils and recycled cooking oils
Ruth, S.M. van; Rozijn, M. ; Koot, A.H. ; Perez-Garcia, R. ; Kamp, H.J. van der; Codony, R. - \ 2010
Animal Feed Science and Technology 155 (2010)1. - ISSN 0377-8401 - p. 65 - 73.
reaction-mass-spectrometry - partial least-squares - trace gas-analysis - electronic nose - vegetable-oils - discrimination - spectroscopy - acids
Classification of fats and oils involves the recognition of one/several markers typical of the product. The ideal marker(s) should be specific to the fat or oil. Not many chemical markers fulfill these criteria. Authenticity assessment is a difficult task, which in most cases requires the measurement of several markers and must take into account natural and technology-induced variation. The present study focuses on the identity prediction of three by-products of the fat industry (animal fats, fish oils, recycled cooking oils), which may be used for animal feeding. Their identities were predicted by their triacylglycerol fingerprints, their fatty acid fingerprints and their profiles of volatile organic compounds. Partial least square discriminant analysis allowed samples to be assigned successfully into their identity classes. Most successful were triacylglycerol and fatty acid fingerprints (both 96% correct classification). Proton transfer reaction mass spectra of the volatile compounds predicted the identity of the fats in 92% of the samples correctly.
Prediction of the identity of fats and oils by their fatty acid, triacylglycerol and volatile compositions using PLS-DA
Ruth, S.M. van; Villegas, B. ; Akkermans, W. ; Rozijn, M. ; Kamp, H.J. van der; Koot, A.H. - \ 2010
Food Chemistry 118 (2010)4. - ISSN 0308-8146 - p. 948 - 955.
reaction mass-spectrometry - trace gas-analysis - dairy-products - ptr-ms - authenticity - chromatography
The identity of a variety of animal fats and vegetable oils was predicted by three different analytical techniques with help of chemometrics. The sample material of animal origin consisted of milk fat, cow fat, pig fat and poultry fat. The vegetable oils comprised coconut, palm and palm kernel oils. Each product group was composed of at least eight samples of independent batches. For the identity prediction of the fats/oils several (combinations of) datasets were used: absolute and relative measurements of fatty acid compositions, of triacylglycerol compositions, and of combined fatty acid and triacylglycerol compositions. Volatile organic compound compositions were used as well. Fatty acid and triacylglycerol compositions were determined by gas chromatography. Fingerprints of volatile compositions were acquired using Proton transfer reaction-mass spectrometry. The rates of successful prediction were high and varied between 89 and 100%. The 100% rate was obtained for the absolute combined fatty acid/triacylglycerol dataset. Proton transfer reaction-mass spectrometry resulted in 89% correct classifications, has the advantage that it allows very rapid measurements compared to the other techniques, but requires further studies
Prediction of the identity of regular and fractionated butter fats by their fatty acid and triacylglycerol compositions using PLS-DA
Ruth, S.M. van; Akkermans, W. ; Villegas-Pascual, B. ; Rozijn, M. ; Kamp, H.J. van der - \ 2008
In: Proceedings of AGROSTAT 2008: 10th European Symposium on Statistical Methods for the Food Industry, 23-25 January 2008, Louvain-la-Neuve, Belgium. - Louvain-la-Neuve : l'Institut de statistique, Universite catholique de Louvain - p. 359 - 365.
Resultaten onderzoek organochloorbestrijdingsmiddelen, chloorbifenylen en zware metalen in organen en vetten. Jaaroverzicht 1996 (Nationaal Plan hormonen en overige stoffen en concept Nationaal Plan Pluimvee)
Roos, A.H. ; Kamp, H.J. van der; Oostrom, J.J. van; Polanen, A. van - \ 1997
Unknown Publisher (RIKILT-DLO rapport 97.02)
Comparison of immunoaffinity columns with Florisil/C18 columns for the determination of aflatoxins in animal feed and maize
Roos, A.H. ; Kamp, H.J. van der; Marley, E.C. - \ 1997
Mycological Research 13 (1997). - ISSN 0953-7562 - p. 2 - 10.
Resultaten onderzoek organochloorbestrijdingsmiddelen, chloorbifenylen en zware metalen in organen en vetten. Jaaroverzicht 1995
Roos, A.H. ; Kamp, H.J. van der; Oostrom, J.J. van; Polanen, A. van - \ 1996
Wageningen : DLO-Rijks-Kwaliteitsinstituut voor land- en tuinbouwprodukten (RIKILT-DLO) (Rapport RIKILT-DLO 96.11) - 9 p.
animal products - analysis - pesticides - heavy metals - polychlorinated biphenyls - analytical chemistry
Resultaten onderzoek organochloorbestrijdingsmiddelen, chloorbifenylen en zware metalen in organen en vetten. Jaaroverzicht 1994 (Nationaal Plan Overige Stoffen en concept Nationaal Plan Pluimvee)
Roos, A.H. ; Kamp, H.J. van der; Oostrom, J.J. van; Polanen, A. van - \ 1995
Wageningen : DLO-Rijks-Kwaliteitsinstituut voor land- en tuinbouwprodukten (RIKILT-DLO) (Rapport RIKILT-DLO 95.03) - 10 p.
organochlorine pesticides - chlorobiphenyls - heavy metals - monitoring
Chemisch onderzoek van broodsmeersels
Kamp, H.J. van der - \ 1995
Wageningen : RIKILT-DLO (Rapport / DLO-Rijks-Kwaliteitsinstituut voor Land- en Tuinbouwprodukten 95.31) - 7
margarine - dierlijk vet - plantaardige vetten - chemische samenstelling - spijsvetten - animal fat - plant fats - chemical composition - edible fats - food
Bepaling van het oliegehalte van het zaad van Crambe abyssinica, Euphorbia lagascae, Dimorphotheca pluvialis en Limnanthes alba met lage resolutie puls NMR
Kamp, H.J. van der; Oostrom, J.J. van; Groenendijk, F.P.F. - \ 1992
Wageningen : DLO-Rijks-Kwaliteitsinstituut voor Land- en Tuinbouwprodukten (Rapport / RIKILT-DLO 92.19) - 15
olieleverende planten - crambe abyssinica - kernmagnetische resonantiespectroscopie - euphorbia - dimorphotheca - limnanthes alba - oil plants - nuclear magnetic resonance spectroscopy
Orienterend onderzoek naar de bepaling van het oliegehalte in Dimorphotheca pluvialis, Crambe abyssinica en Euphorbia lagascae met NMR et NIRS
Kamp, H.J. van der; Groenendijk, F.P.F. ; Oostrom, J.J. van; Frankhuizen, R. - \ 1991
Wageningen : DLO-Rijks-Kwaliteitsinstituut voor Land- en Tuinbouwprodukten (Rapport / RIKILT-DLO 91.52) - 17
crambe abyssinica - euphorbiaceae - olieleverende planten - kernmagnetische resonantiespectroscopie - infraroodspectroscopie - oil plants - nuclear magnetic resonance spectroscopy - infrared spectroscopy
In het kader van het agrificatie onderzoekprogramma van het Ministerie van LNV "Plantaardige technische oliën als nieuwe landbouwgrondstoffen voor de industrie" zijn de mogelijkheden onderzocht om het oliegehalte van Dimorphotheca pluvialis, Crambe abyssinica en Euphorbia lagascae met lage resolutie Nuclear Magnatie Resonance (NMA) en Nabij Infrarood Reflectie Spectroscopie (NIRS) te voorspellen.
Onderzoek naar de bepaling van het carvon- en limoneengehalte in karwijzaad met NIRS
Tusveld, M.A.H. ; Frankhuizen, R. ; Kamp, H.J. van der - \ 1991
Wageningen : DLO-Rijks-Kwaliteitsinstituut voor Land- en Tuinbouwprodukten (Rapport / RIKILT-DLO 91.34) - 16
carum carvi - karwij - etherische oliën - limoneen - carvon - infraroodspectroscopie - caraway - essential oils - limonene - carvone - infrared spectroscopy
In het kader van het "Onderzoeksprogramma ter verbetering van karwij als akkerbouwgewas en ter introduktie van nieuwe afzetmogelijkheden" zijn de mogelijkheden onderzocht om het carvon-, limoneen- en etherisch oliegehalte te voorspellen met NIRS. Als referentiemethode is de gaschromatografische bepaling gebruikt. In totaal zijn 53 monsters karwijzaad met een zo groot mogelijke spreiding in carvongehalte onderzocht. Met een NIRSystems-6500 zijn nabij infrarood reflectiespectra opgenomen.
Ontwikkeling van een bepalingsmethode voor magere melkpoeder in kunstmelkvoeder met FPLC
Korbee, H.J. ; Kamp, H.J. van der; Frankhuizen, R. - \ 1991
Wageningen : DLO-Rijks-Kwaliteitsinstituut voor Land- en Tuinbouwprodukten (Rapport / RIKILT-DLO 91.30) - 17
voedselanalyse - melkvervangers - imitatiemelk - imitatieroom - melkpoeder - vloeistofchromatografie - food analysis - milk substitutes - imitation milk - imitation cream - dried milk - liquid chromatography
Op grond van EEG-verordening 1725/79 wordt financiële steun verleend voor de verwerking van magere melkpoeder (MMP) en ondermelk in kunstmelkvoeders (KUVO's). De verwerkte hoeveelheid MMP kan gecontroleerd worden m.b.v de Resmini-methode welke gestoord kan worden door niet-melkeiwitten, zoals soja- en viseiwitten maar ook door wei-eiwitten en lecithine. Daarnaast kan de verwerking van MMP, gedroogd bij hoge temperatuur (zgn. high-heat poeder) te hoge waarden geven, veroorzaakt door de coprecipitatie van wei-eiwitten met caseines. Doel van dit onderzoek is een analysemethode te ontwikkelen voor de bepaling van MMP in KUVO die ook bij verwerking van lage percentages MMP betrouwbare resultaten geeft. Bovendien moet de opwerking van de monsters relatief eenvoudig zijn terwijl de verhittingsgraad van de MMP en de matrixbestanddelen het analyseresultaat niet mogen beïnvloeden. Tevens is onderzocht of het gehalte zoete en zure karnemelkpoeders (toegevoegd i.p.v. MMP) bepaald kan worden indien deze zijn verwerkt in KUVO's.
Chemisch onderzoek van slagroomgebak en tompoezen
Kamp, H.J. van der; Herstel, H. - \ 1991
Wageningen : DLO-Rijks-Kwaliteitsinstituut voor Land- en Tuinbouwprodukten (Rapport / RIKILT-DLO 91.46) - 8
zoetwaren - biscuits - geslagen room - cakes - voedselsamenstelling - voedselchemie - chemische samenstelling - confectionery - whipped cream - food composition - food chemistry - chemical composition
Op verzoek van Konsumenten Kontakt zijn in januari 1991 20 monsters tompoezen en 20 monsters slagroomgebak onderzocht. Het slagroomgebak bestond uit 13 monsters gebakjes en 7 monsters schnitten (rechthoekige slagroomtaart).
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