[Objectives]This study was conducted to establish a qualitative method for rapid detection of pesticide residues in feed.[Methods]A rapid screening method for 82 pesticide residues in feed was established using ultra ...[Objectives]This study was conducted to establish a qualitative method for rapid detection of pesticide residues in feed.[Methods]A rapid screening method for 82 pesticide residues in feed was established using ultra liquid chromatography coupled with quadrupole-time of flight mass spectrometry(UPLC-Q-TOF-MS)combined with optimized pretreatment methods.[Results]Feed samples were extracted with 0.2%formic acid-acetonitrile solution,shaken,centrifuged,and re-centrifuged,and the supernatant was filtered with a 0.22μm filter membrane for determination.The samples were separated on a Waters ACQUITY UPLC HSS T3 chromatographic column(2.1 mm×50 mm,1.8μm),and subjected to gradient elution with methanol-water solution as the mobile phase,and scanning was performed in ESI+mode.82 compounds could be accurately qualitatively detected in 13 min.[Conclusions]This method is simple to operate,time-saving,and can be applied to rapid screening of large-scale feed.This study provides a theoretical basis for the development of new methods in the future.展开更多
Metal device rapid prototyping with welding is one of the research interests at present. A controlled inertial droplet transfer MAG welding (CIDTMAGW) process was developed for the 3D steel device rapid prototyping wi...Metal device rapid prototyping with welding is one of the research interests at present. A controlled inertial droplet transfer MAG welding (CIDTMAGW) process was developed for the 3D steel device rapid prototyping with metal deposition. In this process, by using a special designed wire feeder, a controlled inertia is imposed on the droplet formed on the wire tip and combines with the arc force to make it detached. Thus, according to the requirements of rapid prototyping, the arc heat and the droplet detaching force can be separately controlled to attain a stable and satisfactory metal deposition process. A CIDTMAGW system and a testing manipulator for the 3D steel device rapid prototyping are presented. The required software is completed as well. The experiments proved that the geometric formation of the rapid prototyping device with welding deposition is well agreed the data of the device CAD modeling. The surface of the deposited device is comparatively smooth.展开更多
目的分析2024年欧盟食品饲料快速预警系统(rapid alert system of food and feed,RASFF)通报各国出口欧盟食品情况,总结欧盟在食品安全方面的重点关注。方法以2024年欧盟RASFF通报各国出口欧盟食品数据为基础,从通报国家、被通报国家和...目的分析2024年欧盟食品饲料快速预警系统(rapid alert system of food and feed,RASFF)通报各国出口欧盟食品情况,总结欧盟在食品安全方面的重点关注。方法以2024年欧盟RASFF通报各国出口欧盟食品数据为基础,从通报国家、被通报国家和地区、通报食品品种和危害类型等多个维度分析通报出口欧盟食品整体情况,并对水果蔬菜类、禽肉及其制品类、坚果及其制品和种子类等重点食品品种,以及病原性微生物、农药残留、真菌毒素等重点危害类型进行分析。结果2024年RASFF通报2124批次食品,29个成员国通报113个国家和地区的食品。涉及25类食品品种,水果蔬菜类、禽肉及其制品类、坚果及其制品和种子类排名前3。涉及27种危害类型,病原性微生物、农药残留、真菌毒素排名前3。结论通过总结欧盟RASFF通报各国出口欧盟食品安全情况,借鉴欧盟经验做法,为我国出口食品企业和监管部门提供参考。展开更多
目的统计分析2019—2025年欧盟食品和饲料快速预警系统(rapid alert system for food and feed,RASFF)通报的中国食品安全数据,确定我国食品质量安全问题。方法依据2019—2025年欧盟RASFF通报的我国出口欧洲相关国家的食品安全风险数据...目的统计分析2019—2025年欧盟食品和饲料快速预警系统(rapid alert system for food and feed,RASFF)通报的中国食品安全数据,确定我国食品质量安全问题。方法依据2019—2025年欧盟RASFF通报的我国出口欧洲相关国家的食品安全风险数据,通过数据处理软件对这些数据进行多维度的对比分析,利用数据在产品类型、危险类别等不同维度中的分布特征、变化趋势和波动情况,深入分析目前我国出口欧洲相关国家的食品质量安全问题。结果2019—2025年RASFF系统对华的通报总数为1995例,其中食品1172例占比最高,食品接触材料744例次之,主要的通报类型是边境拒绝通报;荷兰、意大利、西班牙、德国、波兰是通报量排在前5的国家,蔬菜和水果通报数量自2020年起稳居首位且远超其他产品,农药残留是主要被通报项目;2023年禽肉和禽肉制品被通报次数出现大幅增长,原因是在鸡肉制品中检出氯酸盐。2024年掺假/欺诈和转基因食品问题较往年呈大幅增长,原因是食品标签标注信息与实际产品成分不符、转基因成分信息的缺失。真菌毒素黄曲霉毒素B1在高风险产品花生中超标问题依然要引起重视。近几年出口欧盟的食品包装材料问题突出,主要是尼龙和三聚氰胺塑料厨具中检出初级芳香胺迁移、有害元素和甲醛迁移超标。结论通过对比分析2019—2025年欧盟RASFF系统通报的我国食品风险数据,结合近年有关出口食品质量安全舆情,分析总结我国出口食品被通报总体变化趋势及暴露出的问题,为我国市场监管相关部门和相关生产企业提供参考。展开更多
自2010年开始,中国成为世界第一饲料生产大国。在全球化经济格局下中国饲料对外出口进一步增加。欧盟食品和饲料快速预警系统(rapid alert system for food and feed,RASFF)作为欧盟食品安全监管的核心平台,使欧盟委员会及各成员国能迅...自2010年开始,中国成为世界第一饲料生产大国。在全球化经济格局下中国饲料对外出口进一步增加。欧盟食品和饲料快速预警系统(rapid alert system for food and feed,RASFF)作为欧盟食品安全监管的核心平台,使欧盟委员会及各成员国能迅速发现食品安全风险并及时采取措施,避免风险的进一步扩大,进而保证食品安全。中国饲料虽对欧盟出口不多,但本文通过对2012—2020年欧盟食品和饲料快速预警系统中饲料通报进行分析,总结各国通报中的饲料类型、通报类型、通报来源、通报原因、采取措施、风险决策和分销状况等内容,从而对中国饲料监管和饲料生产企业对外出口提供一定的借签意义。从中国出口的饲料看,主要是饲料原料和宠物饲料(食品)存在一些安全问题,包括沙门氏菌检出和肠杆菌含量超标。中国出口的饲料添加剂主要是转基因成分问题。展开更多
基金Supported by Key R&D Project in Hebei Province(19227516D)Hebei Provincial Phase II Modern Agricultural Industry Technology System Innovation Team Building Project(HBCT2018120207)+2 种基金Hebei Provincial Phase II Modern Agricultural Industry Technology System Forage Industry Innovation Team Building Project(HBCT2018160403)Tangshan Science and Technology Planning Project(21130243A)The Fourth Batch of High-end Talent Project in Hebei Province。
文摘[Objectives]This study was conducted to establish a qualitative method for rapid detection of pesticide residues in feed.[Methods]A rapid screening method for 82 pesticide residues in feed was established using ultra liquid chromatography coupled with quadrupole-time of flight mass spectrometry(UPLC-Q-TOF-MS)combined with optimized pretreatment methods.[Results]Feed samples were extracted with 0.2%formic acid-acetonitrile solution,shaken,centrifuged,and re-centrifuged,and the supernatant was filtered with a 0.22μm filter membrane for determination.The samples were separated on a Waters ACQUITY UPLC HSS T3 chromatographic column(2.1 mm×50 mm,1.8μm),and subjected to gradient elution with methanol-water solution as the mobile phase,and scanning was performed in ESI+mode.82 compounds could be accurately qualitatively detected in 13 min.[Conclusions]This method is simple to operate,time-saving,and can be applied to rapid screening of large-scale feed.This study provides a theoretical basis for the development of new methods in the future.
文摘Metal device rapid prototyping with welding is one of the research interests at present. A controlled inertial droplet transfer MAG welding (CIDTMAGW) process was developed for the 3D steel device rapid prototyping with metal deposition. In this process, by using a special designed wire feeder, a controlled inertia is imposed on the droplet formed on the wire tip and combines with the arc force to make it detached. Thus, according to the requirements of rapid prototyping, the arc heat and the droplet detaching force can be separately controlled to attain a stable and satisfactory metal deposition process. A CIDTMAGW system and a testing manipulator for the 3D steel device rapid prototyping are presented. The required software is completed as well. The experiments proved that the geometric formation of the rapid prototyping device with welding deposition is well agreed the data of the device CAD modeling. The surface of the deposited device is comparatively smooth.
文摘目的分析2024年欧盟食品饲料快速预警系统(rapid alert system of food and feed,RASFF)通报各国出口欧盟食品情况,总结欧盟在食品安全方面的重点关注。方法以2024年欧盟RASFF通报各国出口欧盟食品数据为基础,从通报国家、被通报国家和地区、通报食品品种和危害类型等多个维度分析通报出口欧盟食品整体情况,并对水果蔬菜类、禽肉及其制品类、坚果及其制品和种子类等重点食品品种,以及病原性微生物、农药残留、真菌毒素等重点危害类型进行分析。结果2024年RASFF通报2124批次食品,29个成员国通报113个国家和地区的食品。涉及25类食品品种,水果蔬菜类、禽肉及其制品类、坚果及其制品和种子类排名前3。涉及27种危害类型,病原性微生物、农药残留、真菌毒素排名前3。结论通过总结欧盟RASFF通报各国出口欧盟食品安全情况,借鉴欧盟经验做法,为我国出口食品企业和监管部门提供参考。
文摘目的统计分析2019—2025年欧盟食品和饲料快速预警系统(rapid alert system for food and feed,RASFF)通报的中国食品安全数据,确定我国食品质量安全问题。方法依据2019—2025年欧盟RASFF通报的我国出口欧洲相关国家的食品安全风险数据,通过数据处理软件对这些数据进行多维度的对比分析,利用数据在产品类型、危险类别等不同维度中的分布特征、变化趋势和波动情况,深入分析目前我国出口欧洲相关国家的食品质量安全问题。结果2019—2025年RASFF系统对华的通报总数为1995例,其中食品1172例占比最高,食品接触材料744例次之,主要的通报类型是边境拒绝通报;荷兰、意大利、西班牙、德国、波兰是通报量排在前5的国家,蔬菜和水果通报数量自2020年起稳居首位且远超其他产品,农药残留是主要被通报项目;2023年禽肉和禽肉制品被通报次数出现大幅增长,原因是在鸡肉制品中检出氯酸盐。2024年掺假/欺诈和转基因食品问题较往年呈大幅增长,原因是食品标签标注信息与实际产品成分不符、转基因成分信息的缺失。真菌毒素黄曲霉毒素B1在高风险产品花生中超标问题依然要引起重视。近几年出口欧盟的食品包装材料问题突出,主要是尼龙和三聚氰胺塑料厨具中检出初级芳香胺迁移、有害元素和甲醛迁移超标。结论通过对比分析2019—2025年欧盟RASFF系统通报的我国食品风险数据,结合近年有关出口食品质量安全舆情,分析总结我国出口食品被通报总体变化趋势及暴露出的问题,为我国市场监管相关部门和相关生产企业提供参考。
文摘自2010年开始,中国成为世界第一饲料生产大国。在全球化经济格局下中国饲料对外出口进一步增加。欧盟食品和饲料快速预警系统(rapid alert system for food and feed,RASFF)作为欧盟食品安全监管的核心平台,使欧盟委员会及各成员国能迅速发现食品安全风险并及时采取措施,避免风险的进一步扩大,进而保证食品安全。中国饲料虽对欧盟出口不多,但本文通过对2012—2020年欧盟食品和饲料快速预警系统中饲料通报进行分析,总结各国通报中的饲料类型、通报类型、通报来源、通报原因、采取措施、风险决策和分销状况等内容,从而对中国饲料监管和饲料生产企业对外出口提供一定的借签意义。从中国出口的饲料看,主要是饲料原料和宠物饲料(食品)存在一些安全问题,包括沙门氏菌检出和肠杆菌含量超标。中国出口的饲料添加剂主要是转基因成分问题。
