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目的建立测定中草药类保健食品中有机磷农药残留的分散固相萃取-分散液液微萃取-气相色谱-质谱联用法。方法样品经含0.5%甲酸的乙腈超声提取,上清液经含无水硫酸镁、N-丙基乙二胺(PSA)、C18的分散固相萃取管(d-SPE)净化后,采用分散液液微萃取(DLLME)步骤,用氯仿萃取、浓缩目标化合物。结果在最优条件下,线性范围为0.05~1.00μg/ml,线性相关系数在0.999以上,检出限(LOD)为0.3~3.0μg/kg,29种有机磷农药的平均加标回收率在70.3%~107.5%之间,相对标准偏差均10%。结论该方法具有简便快速、准确灵敏、萃取效率高等特点,可用于中草药类保健食品中有机磷农药残留的检测。 相似文献
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Carb/PSA固相萃取净化一气相色谱质谱法测定茶叶中的34种农药成分 总被引:1,自引:0,他引:1
建立了茶叶中34种农药多残留的气相色谱质谱分析方法。茶叶样品用乙腈一次性提取后,经Carb/PsA固相萃取小柱净化,气相色谱质谱定性定量。添加回收试验的结果表明:34种农药的平均回收率70%124%,相对标准偏差为0.2%-14.9%。方法的检出限为0.1-25.0μg/kg。该方法的灵敏度、准确度和精密度均符合农药残留测定的技术要求。 相似文献
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长期使用拟除虫菊酯类农药产生的健康风险问题使人们对农药残留限量的要求更为严格,农药残留检测前处理技术直接影响其分析效率和分析准确度。对近年来国内应用于食品中拟除虫菊酯类农药残留检测前处理技术中的萃取技术(如浊点萃取、超声波萃取、加速溶剂萃取、分散液液微萃取等)、净化技术(如凝胶渗透色谱、固相萃取等),以及萃取、净化一体化技术(如固相微萃取、基质固相分散萃取、QuEChERS法、磁性固相萃取等)进行综述,并对其发展趋势进行展望。 相似文献
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目的建立固相微萃取-气相色谱-串联质谱法快速筛查检测葡萄酒中农药残留。方法葡萄酒样品稀释后进行固相微萃取,直接进行气相色谱-串联质谱检测。优化选择了萃取纤维类型、萃取方式、萃取时间等固相微萃取的实验条件,考察了方法性能(检出限、添加回收率和精密度等)。结果确定方法可检测目标农药为94种,其检出限10μg/L,平均回收率在60%~110%之间,且方法的重复性和再现性标准偏差分别在20%和30%之内。结论该检测方法操作简便、快速,单个样品分析时间不超过1 h,适用于葡萄酒中农药残留的快速筛查检测。 相似文献
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目的 建立罗汉果中六六六、滴滴涕的基质固相分散萃取(MSPD)-气相色谱(GC)分析方法。方法 采用基质固相分散萃取技术作为前处理方法, 用气相色谱法进行快速定性定量分析。结果 八种有机氯农药的添加回收率在75.1%~112.4%之间, 相对标准偏差为2.1%~12.4%之间。基质固相分散萃取将提取、过滤和净化一步完成, 简化了传统样品的前处理过程, 缩短了时间, 节省溶剂, 也减少了对环境的污染。结论 该方法作为罗汉果中的六六六、滴滴涕有机氯农药残留的快速检测新方法, 基本能满足国内以及国际对农药残留分析质量控制要求。 相似文献
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气相色谱法在农药残留分析中的应用 总被引:6,自引:0,他引:6
固相萃取是目前常用的一种样品预处理方法, 它具有高效、快速、方便和高选择性等特点.气相色谱是农药和药物残留分析中应用最多的分析检测方法,固相萃取和气相色谱的联用实现了样品前处理及分离分析的优化组合.综述了固相萃取和气相色谱联用技术在农药残留分析中的应用. 相似文献
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目的比较液液萃取法、固相萃取法和分散式固相萃取法作为预处理方法对葡萄酒中的氨基甲酸乙酯的处理效率。方法葡萄酒样品中的氨基甲酸乙酯分别用二氯甲烷进行液液萃取,用氨基甲酸乙酯专用柱进行固相萃取,用乙腈、石墨化炭黑和N-丙基乙二胺进行分散式固相萃取,再以气相色谱-质谱联用仪测定其含量。结果 3种预处理方法的平均回收率均在70%~110%之间,相对标准偏差(n=5)均小于6%。液液萃取法处理单个样品成本小于5元,富集倍数可达5倍,可用于低含量样品的预处理和进出口企业的产品合规性检测;固相萃取法操作简便,每人每工作日可处理40个样品,可用于企业的高通量检测;分散式固相萃取法成本适中、回收率最佳、综合预处理效率高,一次预处理可同时检测葡萄酒中农药残留和氨基甲酸乙酯含量,适用于葡萄酒中多种危害物质的筛查。结论三种方法各具优势,综合考虑处理效率和实验成本,分散式固相萃取法更适合葡萄酒生产企业的日常应用。该方法已用于葡萄酒中氨基甲酸乙酯的含量测定。 相似文献
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Figueroa-González I Quijano G Ramírez G Cruz-Guerrero A 《Journal of the science of food and agriculture》2011,91(8):1341-1348
Owing to their health benefits, probiotics and prebiotics are nowadays widely used in yogurts and fermented milks, which are leader products of functional foods worldwide. The world market for functional foods has grown rapidly in the last three decades, with an estimated size in 2003 of ca US$ 33 billion, while the European market estimation exceeded US$ 2 billion in the same year. However, the production of probiotics and prebiotics at industrial scale faces several challenges, including the search for economical and abundant raw materials for prebiotic production, the low-cost production of probiotics and the improvement of probiotic viability after storage or during the manufacturing process of the functional food. In this review, functional foods based on probiotics and prebiotics are introduced as a key biotechnological field with tremendous potential for innovation. A concise state of the art addressing the fundamentals and challenges for the development of new probiotic- and prebiotic-based foods is presented, the niches for future research being clearly identified and discussed. 相似文献
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常用消毒灭菌法及其机理与应用 总被引:3,自引:0,他引:3
介绍了采用消毒灭菌方法,有加热消毒法,紫外线辐射法和化学药剂消毒法。常用化学药剂有醛类、含氯消毒剂、醇类消毒剂以及高锰酸钾、生石灰等,阐释了消毒与灭菌两个概念的区别。 相似文献
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Wim Verbeke Federico J.A. Pérez-Cueto Marcia D. de Barcellos Athanasios Krystallis Klaus G. Grunert 《Meat science》2010
This paper presents the combined mid-term findings of the consumer research components of two EU Sixth Framework Programme integrated projects concerning meat, ProSafeBeef and Q-PorkChains. The consumer pillar of ProSafeBeef carried out eight focus group discussions in May 2008, in France, Germany, Spain and the UK. Q-PorkChains conducted a large-scale, web-based, consumer survey in January 2008 in Belgium, Denmark, Germany, Greece and Poland. The first project provides a set of qualitative data from a small cohort of focus groups and the second a set of quantitative data from a larger consumer sample. This paper draws together the main findings of both projects and provides a comprehensive overview of European citizens’ and consumers’ attitudes towards and preferences regarding beef and pork. In general, consumers consider meat to be a healthy and important component of the diet. Consumers support the development of technologies that can improve the health attributes of meat products and guarantee eating quality, but they have a negative view of what they see to be excessive manipulation and lack of naturalness in the production and processing of beef products. In the Q-PorkChains study consumer and citizen segments are identified and profiled. Consumer segments were built upon the frequency and variety of pork consumption. The citizen segments were built upon their attitudes towards pig production systems. Overall, the relationship between individuals’ views as citizens and their behaviour as consumers was found to be quite weak and did not appear to greatly or systematically influence meat-buying habits. Future studies in both projects will concentrate on consumers’ acceptance of innovative meat product concepts and products, with the aim of boosting consumer trust and invigorating the European beef and pork industries. 相似文献
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果蔬可以提供营养, 有利于人类健康, 而果蔬的后熟及其与环境的相互作用会影响果蔬采后的质量和安全。对果蔬生物学过程的了解和掌握是减少果蔬采后损失和保障果蔬采后质量和安全的关键。在过去的10多年, 基于组学技术的系统生物学在了解果蔬后熟及其与环境相互作用的分子机制方面得到了越来越多的应用。本文对此做了细致的总结, 指出了存在的不足, 并提出了未来的发展方向。 相似文献
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