TY - THES T1 - Determination and use of processing factors for pesticide residues after processing of fruit and vegetables : carrot, celery, spinach, melon Y1 - 2012 A1 - A. Bonnechère ED - Bragard,C. ED - V. Hanot KW - application KW - AS KW - assessment KW - Blanching KW - Change KW - Combination KW - consumer KW - d KW - detection KW - Ethylenethiourea KW - EVALUATION KW - factors KW - food KW - Frequency KW - Fruit KW - IS KW - Lead KW - Leaf KW - LEVEL KW - levels KW - observed KW - ON KW - Order KW - parameters KW - pesticide KW - Pesticide residues KW - Pesticides KW - ph KW - Practice KW - PRACTICES KW - Processing factor KW - production KW - RANGE KW - Reduction KW - regulation KW - Residue KW - risk KW - Risk Assessment KW - risks KW - Spinach KW - time KW - use KW - VARIABILITY KW - varieties KW - variety KW - Vegetable KW - Vegetables KW - work AB - The content of pesticide residues in fruit and vegetables is influenced by washing, peeling and cooking. Processing factors, reflecting the change in concentration of these residues following processing, help to refine the risk assessment for consumers. Four commodities (carrot, celery, spinach and melon) were selected in combination with a panel of pesticides (acetamiprid, azoxystrobin, boscalid, carbendazim, chlorpyrifos, lambda-cyhalothrin, cyromazine, deltamethrin, difenoconazole, dimethoate, imazalil, iprodione, linuron, mancozeb, maneb, phenmedipham, pirimicarb, propamocarb, tebuconazole, thiamethoxam), on the basis of most frequently consumed matrices and of the high frequency of detection for these pesticides. For some combinations pesticide-commodity-processing, significant reductions in residue levels were observed up to 90% during washing and peeling, 70% during blanching and 99% during sterilization. However, other combinations did not lead to any reduction, or occasionally lead to the production of more toxic compounds. Indeed, during the sterilization of spinach, maneb degradation has led to the emergence of ethylenethiourea. The variability, which was sometimes very strong for processing factors determined for the same combination, leads us to question the current regulations, which are currently based on the evaluation of only two processing factors. Although the physico-chemical properties of pesticides may explain the processing factors obtained for leaves vegetables like spinach, our work illustrates that a broad range of parameters actually influence the processing factors, as for example the application time of pesticide or the choice of variety. These elements support the relevance of a reassessment of agricultural practices in order to limit further risks for the consumer. PB - Université Catholique de Louvain CY - Louvain-La-Neuve CP - 11/2012 U1 - 2116 ER -