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A study was undertaken to assess the effects of storage intervals and of milling procedures on the dissipation of chlorpyrifos-methyl and pirimiphos-methyl residues in post-harvest-treated wheat grain and to obtain scientific data on the compliance of the processed products with safety requirements concerning baby foods. The insecticide formulations were applied on stored wheat at recommended rates (20 ml t-1). The initial concentration levels in whole grain were determined in samples taken 1 h after treatment. The dissipation of residues and their distribution in different fractions of the milled grain were studied after various storage intervals, from 7 to 270 days after treatment. Samples of treated grain were milled in a fractionating laboratory mill and eight fractions — bran, semolina, three types of groats and three types of flour — were collected and analysed for pesticide residues. The residues were determined by an analytical method based on acetone extraction, graphitized carbon clean-up and GC-ECD, respectively, and GC-NPD determination of residues. The limits of determination of both pesticides were 0.005 mg kg-1, which is high enough for enforcement of the European Commission Directive that established a maximum residue level of 0.01 mg kg-1 for any pesticide in cereal-based baby food. The results showed that the pesticides chlorpyrifos-methyl and pirimiphos-methyl applied post-harvest on wheat as grain protectants were distinguished by relatively low rates of degradation in the grain under practical storage conditions. Milling did not significantly reduce the bulk of the chemicals but resulted in the distribution of residues in various processed products. The main part of the insecticides deposited on the grain remained in the bran and partly in semolina fractions. After 270 days of treatment, the residues of chlorpyrifos-methyl were within the range 0.8-2.1 mg kg-1 and of pirimiphos-methyl — between 0.6 and 3.7 mg kg-1 in the various types of flour.  相似文献
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目的 评价市售的18种呕吐毒素快速检测产品的性能指标及在现场快检中的适用性, 为基层在粮食加工品监管领域中呕吐毒素快检产品的选择与应用提供指导, 同时建立了一种食品快速检测试产品的评价方法。方法 以玉米粉为基质, 采用自然染菌的方式制备盲样, 对18个厂家的呕吐毒素快速检测产品进行测试, 以检测限、假阳性率、假阴性率、灵敏度、特异性、相对准确度为性能指标, 同时考察快检产品的在现场快检中的适用性。结果 本次评价的18种快检产品中, 有8种呕吐毒素快检产品符合标准要求, 在现场快检中的适用性良好, 合格率为44.4%。结论 呕吐毒素胶体金快速检测产品具有快速、准确、方便、灵敏高等特点, 可在粮食加工品的质量监管与质量控制中使用, 但仍有部分产品达不到标准要求, 因此在快检产品使用前, 有必要对其进行评价。  相似文献
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食品安全关系国泰民生,党和国家高度重视食品安全。食品抽检工作逐渐突显为食品安全监管的重要手段之一。正确的食品分类是抽检工作准确的基础、先决条件。然而在实际工作中发现不同法规标准中的食品分类不同,给食品抽检工作甚至是监管工作都带来一定的挑战和困难。为进一步规范粮食加工品的食品分类,提高市场监管部门开展的食品安全抽检工作的质量,助推食品安全抽检工作高质量发展,本文梳理粮食加工品的相关法规标准、总结近年来参与食品抽检工作的经验,对粮食加工品的抽检工作中食品四级分类以及判定注意事项进行比较说明,旨在能够成为市场监管体系下食品安全抽检工作的技术指导。  相似文献
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