福州市蔬菜农药残留检测与分析

采用农业行业标准NY/T761-2008检测方法,用气相色谱仪对福州市3家超市和3家农贸市场销售的16个蔬菜品种共60份样品进行有机氯及拟除虫菊酯类农药残留的检测,并根据GB2763 - 2005标准判定检出超标情况.结果表明:农药残留检出率为31.67％;农药残留超标率为3.33％.从蔬菜种类上,白菜类、瓜类的检出率...     

蔬菜中农药残留检测技术研究进展

对目前蔬菜中农药残留分析检测方法及其前处理过程以及快速检测技术作了综述。固相萃取(SPE)、超临界流体萃取(SFE)等新的萃取方法已逐渐代替了液-液萃取(LLE)等传统提取方法。色谱技术是农药残留分析中的重要手段。毛细管气相色谱(CGC)、高效液相色谱(HPLC)及其联用技术是现阶段农药残留分析中的主要检测方法。并指出了今后该领域的研究方向。     

菏泽市市售蔬菜农药残留分析及应对策略

为进一步提高市售蔬菜的质量水平和监管力度,采用气相色谱法对市售7大类蔬菜进行有机磷类和有机氯类农药残留分析。结果表明：超市所售蔬菜的检出率最低,农药残留多集中在绿叶类蔬菜,百菌清和毒死蜱的检出率相对较大,蔬菜的安全状态有一定的风险。文章分析了产生这一结果的主要原因,并提出应对策略。     

用荧光技术检测蔬菜中的残留农药

用荧光光谱仪测试了几种用于蔬菜的常用农药的荧光光谱。从一些市售农药上记录到了荧光特征峰,从而可以区分这些农药。据此,可利用荧光光谱仪根据荧光光谱的不同,实时实地和快速地识别这些农药及其在粮食、蔬菜、水果表面上的可能残留。     

蔬菜中有机磷农药残留的高效液相色谱分析

应用高效液相色谱法测定蔬菜中有机磷农药残留量。采用高效液相色谱法,C18色谱柱、流动相为甲醇：水(V：V)=70：30,用紫外检测器检测。测定了蔬菜中甲1605和久效磷两种常用有机磷农药的残留量。该法相关性好,线性范围广,精密度高,准确度好。     

荔枝农药残留的初步调查

本文对广东省一些荔枝园进行抽样调查,结果初步显示按常规方式生产的荔枝有三氯杀螨醇、氯氰菊酯以及甲胺磷农药残留,而经权威认证机构认证的有机荔枝园生产的有机荔枝未检测出农药残留.有机荔枝的出现解决了食品安全问题,是未来荔枝市场发展的必然趋势.     

农药的轭合与结合态残留

随着科技水平的不断提高,人们对农药残留影响生态环境的认识不断在更新和完善。农药的轭合与结合残留是在标记农药的出现和高精度分析仪器和技术得到应用后被发现和认识的。国外在这方面的研究开展得较早,工作也较     

环境介质中有机磷农药残留检测方法的研究与进展

在我国农业生产中,有机磷农药大量用于果蔬中,成为广谱、高效的病虫害防治手段.然而,由于有机磷农药长期不合理及过量使用,造成农作物、土壤和水等环境介质中出现有机磷农药或是其代谢物的残留,对消费者的健康产生极大威胁,农药残留问题已成为威胁食品安全的重大隐患.开发检测环境介质中有机磷农药残留的高灵敏和高准确性的方法具有极其重...     

有机磷农药对人类健康的影响及农药残留检测方法研究进展

随着工农业生产的发展, 社会与生态环境环境对人类健康的影响愈来愈大。环境污染严重影响人类身体和心理健康。对有机磷农药的生产及使用现状, 有机磷农药的结构和毒性作用, 有机磷农药残留对生态环境的污染和对人类健康的危害以及检测方法进行了探讨, 以期为有机磷农药的安全使用和农药残留检测提供参考依据。     

低农药残留量的乌龙茶种质资源筛选研究

以福建省武夷山茶叶科学研究所鸟龙茶种质资源圃120份资源为试验材料,依外部形态特征初步筛选出31份比较有希望的品种（系）。将联苯菊酯、甲氰菊酯、氯氰菊酯和噻嗪酮4种农药喷施于这31份资源,7d后采摘鲜叶,烘干固样。用气相色谱法分析检测31份品种（系）鲜叶中4种农药的残留量,筛选出低联苯菊酯、低甲氰菊酯、低氯氰菊酯和低噻嗪酮残留量的乌龙茶特异资源各5、4、3和7份。     

深圳市南山区西丽人民医院辖区2005-2009年麻疹疫情分析

为了掌握深圳市南山区西丽人民医院辖区内麻疹病毒流行现状,评价该院辖区麻疹疫苗接种效果,为今后制订麻疹预防控制策略提供依据。采用回顾性调查方法,将2005-2009年间的麻疹发病情况作了分析。2005、2007两年发病人数最多,发病率较高,随着麻疹疫苗强化免疫活动的开展,使疫情有了较大的下降趋势。结果表明,接种麻疹疫苗是最有效地预防麻疹疫情的手段。     

Risk assessment of oncogenic potency of pesticide residues in fruits and vegetables

Pesticides are used in agriculture to improve food security by assuring good harvest, however, they can have harmful effects in human beings and animals. One of the harmful effects of pesticides is their carcinogenicity. Exposure to oncogenic compounds may result in cancer to the exposed animal or person. In this paper, exposure assessment of oncogenic potency of pesticides was performed from raw and processed fruits and vegetables. The oncogenic risk was calculated by multiplying the estimated daily intake (EDI) of the pesticide residue with the oncogenic potency factor (Q*) of the concerned pesticide. The total potential oncogenic risk was calculated to be 2.76 x 10(-3) before processing and 8.97 x 10(-4) after processing. The risk was higher than the EPA acceptable limit of 1 x10(-6). Despite the calculated levels exceeding the EPA acceptable limit, food processing activities reduced the dietary oncogenic risk to an average 33.8%.     

Health risk assessment from dermal exposure to pesticide residues on vegetables among greengrocers in fresh market,Bangkok, Thailand

Pesticide residues (PRs) in market vegetables have been reported regularly. Greengrocers may be exposed to several sorts of PRs on vegetables through hand contact. Health risk assessment from occupational exposure to PRs on vegetables is particularly concerning. This study was conducted among 91 vegetable vendors at a large fresh market in Bangkok. Hand wipe samples were collected in the dry season to extract and analyze PRs including organophosphates (OPs), pyrethroids (PYs), and carbamates (CAs) by gas chromatography (GC-FPD/GC-μECD) and liquid chromatography (LC–MS). The results showed that all wipe samples contained OPs, PYs, and CAs, mainly chlorpyrifos (0.01–0.14 µg/hands) and cypermethrin (0.42–11.64 µg/hands). The frequently detected PRs were aldicarb (87.2%), carbofuran (69.2%), permethrin (63.7%), and profenofos (60.0%). At 99th percentile values of PR exposure, average daily dose was 2.42 × 10^?5 mg/kg/d and hazard index did not exceed the acceptable level (0.287). Glove wearing, hand washing, and work-related factors were significantly associated with PRs on hands after adjusted for gender (p-value < 0.05). Greengrocers may therefore not be at risk from PRs on vegetables and exposure via hands during their work. However, these findings suggest that proper personal hygiene practices among greengrocers should be considered to prevent them from PR exposure and potential health risks.     

从罗汉果渣中提取水不溶性膳食纤维的研究

采用化学法、酶法、酶与化学结合法从罗汉果渣中提取水不溶性膳食纤维,并且对三种提取方法所得的水不溶性膳食纤维产品特性进行了分析比较。研究结果表明,采用酶与化学结合法提取到的水不溶性膳食纤维产品纯度最高、生理活性最好,产率为87.15％,蛋白质含量为2.03％,持水力与膨胀力分别为3.807 g·g-1和1.69 mL·g-1。但从成本和实用方面考虑,还是以化学法为宜。