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高效液相色谱法对谷物中呕吐毒素的测定   总被引:6,自引:0,他引:6  
样品经乙腈-水(84∶16)溶液提取,提取液通过MycoSepTM227和MultiSepTM216柱净化、浓缩,C18色谱柱分离,紫外检测器检测,外标法定量。对添加两个水平呕吐毒素的玉米样品进行加标样回收实验,平均回收率为84.13%和88.14%,最低检测限为2μg/kg。结果表明,此法不仅定量准确、精密度高,而且操作极为方便。  相似文献
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利用胶体金免疫层析法,研制了一种能够快速检测黄豆中呕吐毒素含量的试纸条。通过试验,胶体金试纸条对呕吐毒素的检测限是1μg/g,对玉米赤霉烯酮毒素、黄曲霉毒素B1、赭曲毒素A等无交叉反应,假阳性率和假阴性率均为0,检测时间为10min。试纸条能够准确、可靠、简便、快速地检测黄豆中残留的呕吐毒素,适合大量样品的现场检测。  相似文献
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Mycotoxins are a potential health threat in cereals including wheat. In the European Union (EU), mycotoxin maximum levels are laid down for cereal raw materials and final food products. For wheat and wheat‐based products, the EU maximum levels apply to deoxynivalenol (DON), zearalenone, aflatoxins, and ochratoxin A. This review provides a comprehensive overview on the different mycotoxins and their legal limits and on how processing of wheat can affect such contaminants, from raw material to highly processed final products, based on relevant scientific studies published in the literature. The potential compliance with EU maximum levels is discussed. Of the four mycotoxins regulated in wheat‐based foods in the EU, most data are available for DON, whereas aflatoxins were rarely studied in the processing of wheat. Furthermore, available data on the effect of processing are outlined for mycotoxins not regulated by EU law—including modified and emerging mycotoxins—and which cover DON derivatives (DON‐3‐glucoside, mono‐acetyl‐DONs, norDONs, deepoxy‐DON), nivalenol, T‐2 and HT‐2 toxins, enniatins, beauvericin, moniliformin, and fumonisins. The processing steps addressed in this review cover primary processing (premilling and milling operations) and secondary processing procedures (such as fermentation and thermal treatments). A special focus is on the production of baked goods, and processing factors for DON in wheat bread production were estimated. For wheat milling products derived from the endosperm and for white bread, compliance with legal requirements seems to be mostly achievable when applying good practices. In the case of wholemeal products, bran‐enriched products, or high‐cereal low‐moisture bakery products, this appears to be challenging and improved technology and/or selection of high‐quality raw materials would be required.  相似文献
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目的建立QD-Infinity免疫荧光法快速测定玉米中呕吐毒素含量的方法,为玉米中呕吐毒素现场筛查提供快速、有效的检测/监测手段。方法通过测定玉米质控样、阴性玉米的添加回收率,与高效液相色谱(high performance liquid chromatography, HPLC)法测定天然玉米进行比较,对QD-Infinity免疫荧光测定法的准确度、精密度及其检出限与定量限进行全面评估。结果玉米质控样中呕吐毒素含量测定值均在其理论值范围内;回收率结果为109.77%、107.83%和111.01%,变异系数分别为9.77%、7.83%、11.01%;与HPLC法相比,测定26份玉米结果的相对偏差在1.20%~5.78%之间;该方法的检出限与定量限分别为10μg/kg、32μg/kg。结论 QD-Infinity免疫荧光法是一种有效、实用的分析方法,能用于玉米中呕吐毒素的定量检测。  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
6.
The effects of oxidizing (potassium bromate and L-ascorbic acid) and reducing (sodium bisulfite and L-cysteine) agents, and ammonium phosphate, at varying levels, on deoxynivalenol (DON; vomitoxin: 3,7,15-trihydroxy-12,13-epoxytrichothec-9 en-8 one) in whole wheat flour were investigated during breadbaking. Baking of flour containing 3.13 μg/g DON brought about 7.0% toxin reduction in bread. Sodium bisulfite (25 and 50 μg/g) L-cysteine (10, 40, and 90 μg/g and ammonium phosphate (1,000 μg/g) were moderately effective in reducing DON level in bread (38.0 to 46.0%). Potassium bromate (25 and 75 μg/g) and L-ascorbic acid (50 μg/g) had no effect.  相似文献
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小麦赤霉病引起的真菌毒素污染是影响小麦质量安全的关键因素。本研究利用等离子体处理,可降解50%乙腈水溶液中的呕吐毒素,并通过胶体金定量试纸条和液质联用仪进行了测定。通过高分辨质谱测定,并分析降解产物结构,鉴定出12种降解产物。进一步对低毒性去环氧基降解产物质谱碎片峰进行匹配分析其裂解途径。结果表明预测的分子结构和检测的二级质谱数据之间匹配度高,确证了降解产物的结构信息。最后,通过胶体金定量试纸条对小麦提取液中呕吐毒素的降解效果进行评价,发现2 min处理降解效率高达90%以上。本研究将为利用等离子体降解小麦及饲料发酵溶液及相关制品中的呕吐毒素提供支撑。  相似文献
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